Water Quality Trends at Minnesota Milestone Sites

Transcript

1 Water Quality Trends for Minnesota Rivers and Streams at Milestone Sites Five of seven pollutants better, two getting worse June 2014

2 The MPCA is reducing printing and mailing costs Author by using the Internet to distri bute reports and David Christopherson information to wider audience. Visit our site web for more information. post MPCA reports are printed on 100 - % consumer recycled content paper manufactured without chlorine or chlorine derivatives. Agency Minnesota Pollution Control -4194 -296 oad N orth | Saint Paul, MN 55155 520 Lafayette R | www.pca.state.mn.us | 651 -6300 -657 | TTY 651 -3864 800 Toll free -5332 -282 This report is available in alternative formats upon request, a nd online at www.pca.state.mn.us . Document number: -s1-71 wq

3 1 Summary term trend analysis of seven different water pollutants measured at 80 locations across Minnesota Long- for more than 30 years shows consistent reductions in five pollutants, but consistent increases in two pollutants. Concentrations of total suspended solids, phosphorus, ammonia, biochemical oxygen demand, and bacteria have significantly decreased, but nitrate and chloride concentrations have risen, tone” monitoring according to data from the Minnesota Pollution Control Agency’s (MPCA) “Miles network. Recent, shorter -term trends are consistent with this pattern, but are less pronounced. Pollutant concentrations show distinct regional differences, with a general pattern across the state of lower levels in the northeast to higher levels in the southwest. These trends reflect both the successes of cleaning up municipal and industrial pollutant discharges during this period, and the continuing challenge of controlling the more diffuse “nonpoint” polluted ts of increased water volumes from artificial drainage practices. runoff sources and the impac Monitoring Program Minnesota Milestone The Minnesota Milestone sites are a collection of 80 monitoring locations at rivers and streams across -term water quality data. The period of record is generally more than 30 years, the state with good, long through 2010, with monitoring at some sites going back to the 1950s. While the Milestone sites are not necessarily representative of Minnesota’s rivers and streams as a whole, they do provide a valuable and -spread historical record for many of the state’s waters. wide Monitoring was done by MPCA staff for a standard set of key pollutants on a regular basis, usually -1990s, monthly for 9 to 10 months of the year. Generally, sites were sampled each year throug h the mid at which time the sampling frequency was reduced to two out of every five years on a rotating basis. In some cases and when appropriate for this report, data from the Milestone sites has been supplemented with data collected at the sites through other monitoring efforts. All water quality data is stored in the Environmental Quality Information System (EQuIS). In 2010 the Minnesota Milestone program was superseded by the Minnesota Watershed Pollutant Load Monitoring Network, which will be used to evaluate water quality trends in the future. This new network has more than twice as many monitoring sites, much more frequent monitoring, and includes streamflow to document not only the concentration of pollutants, but also pollutant loads, flow - weighted mean pollutant concentrations, and watershed pollutant yields. Analysis m ethods in this report was performed using the Seasonal Kendall Test for Trends. The a Seasonal nalysis The is a nonparametric test that has the advanta ges of being robust to outliers, missing values, and Kendall , can account for seasonal differences, and is now commonly used to values less than detection limits - analyze water quality trends. The trends shown are monotonic in nature, meaning that they are one trends over the relevant period. As such, they -term trends within the way may not reflect shorter period . For example, early decreases in pollutant levels, followed by maintenance of those levels, will be listed as a “decreasing trend.” Likewise, increasing levels of pollutants followed by decreasing levels of pollutants may be listed as "no trend." Because flow information is not available for many of the sites, flow adjustment for the trends is not part of the analysis. It should be noted that the period of r ecord shown for each monitoring site does not necessarily indicate regular, continuous monitoring for all the listed pollutants over all years. In some cases, monitoring for certain of the pollutants may have begun some time subsequent to the initial date; the

4 2 initial 10 -year period for which median pollutant concentrations are shown can thus vary from pollutant In addition, the analytical detection limit for ammonia was lowered considerably in the to pollutant. 1970s, and the trend analysis for that pollutant generally begins at that time. Likewise, there are sometimes significant gaps in the data when monitoring for some or all of the or over -estimates pollutants was interrupted for a time. Such gaps can occasionally result in under- regarding annual and overall changes; the latter is particularly true for chloride, which had relatively little monitoring for a number of years. In such cases, looking at the median concentrations for the -year periods can help to give a better picture o f actual conditions. beginning and ending 10 Trends shown are statistically significant at the 90% confidence level. Percentage changes are statistical A be higher or lower. , and actual changes could of course estimates based on the available data designation of "no trend" means that a statistically significant trend has not been found; this may be because there is not enough data or there is too much natural variability in the data to discern the actual trend. The annual and overall changes in pollutant concentrations and the med ian concentrations are estimates from the available data, and are subject to the various limitations of that data. In particular, the results for individual sites can be affected by such things as the precise timing of the monitoring, gaps in the data, sma ll data sets, and the large amount of natural variability inherent in water quality monitoring. shown in the table and maps are median summer (Jun e- August ) values, oncentrations The pollutant c All concentrations are in mg/L (parts per except for chlorides, which are median year-round values. million) . No map has been created for recent 10 -year median ammonia concentrations because levels at the vast majority of Milestone sites are now below laboratory detection limits. Results The Minnesota Milestone sites , show significant reductions over the period : Improvements , as a whole of record across the state for total suspended solids, phosphorus, ammonia, and biochemical oxygen demand. For all four of these parameters, the trends that are discernible are almost entirely in a positive environmental direction. In addition, it should be noted that bacterial pollution in Minnesota streams has also decreased significantly over the Milestone monitoring period. While the change in monitoring parameter in the early 2000 s from fecal coliform bacteria to E. coli (the latter is considered to be a better indicator of pathogens which can affect human health) has precluded an accurate updating of the earlier trends work, the vast majority (82%) of Milestone sites showed decreasing pollutant trends for bacteria through the year 2000, and the continued monitoring for E. coli gives no indication of any reversal in this trend. Increasing Problems For nitrate and chloride, the picture is much different, with Milestone sites largel y : increasing pollutant levels, or no trends. showing trends in the opposite direction, with The results of this study, while not identical because of differences in both the data and the statistical methods used, are consistent with those of other studies of trends in Minnesota rivers and streams. The positive, decreasing pollutant trends for total suspended solids, phosphorus, ammonia, biochemical oxygen demand, and bacteria reflect the considerable progress made during the overall Milestone period in controlling municipal and industrial point sources of pollution. The negative, increasing pollut ant trends for nitrate and chloride, on the other hand, likely reflect continuing, and in some ways more difficult, nonpoint source problems such as agricultural practices (nitrogen) and road salt application (chloride).

5 3 Concern regarding nitrogen in Minne sota’s waters has grown in recent decades, with the discovery that -health drinking water standard, with increasing studies some streams now exceed the state’s human showing the toxic effects of nitrate on aquatic life, and with the fact that nitrogen in th e Mississippi plays the major role in causing a large oxygen -depleted River – originating in part from Minnesota – “dead zone” in the Gulf of Mexico. In response, the MPCA is developing aquatic -life -toxicity water quality standards for nitrogen and is likewise developing a state -level Nutrient Reduction Strategy which will identify how further progress can be made to reduce nitrogen (and phosphorus) in our waters. e Concern regarding chloride in Minnesota’s waters is somewhat newer. An examination of Mileston trends in 2000 did not look at chloride because of a lack of sufficient data. Increased monitoring since hown significant, largely statewide increases in chloride concentrations over that time, however, has s the years of the Milestone program. Monitoring for chloride has subsequently been increased in other waters, especially in the Twin Cities metro area. The MPCA has listed a number of waters as impaired by hat the pollutant and is working with local governments and others to reduce the amount of chloride t enters our waters from the various sources, especially the application of road -deicing salts. Distinct regional differences in pollutant concentrations are evident at the Regional differences: Milestone sites. As a general pattern, levels are lower in the northeast portion of the state and higher as one moves south and west. The differences are sometimes dramatic – median pollutant concentrations can be more than one hundred times as high at a site in one part of the state in comparison with te in another part of the state. another si These differences correspond with the division of the state into “ecoregions,” representing differences climate, soils, geology, topology in etc. The differences in pollutant concentrations are , vegetation, reflective both of differences in natural conditions across the state, and, more importantly, in differences in the resulting types and intensity of land use. Recent flattening of trends: While the overall trends are quite clear when looking at the entire period of record for most sites, trends show up much less frequently when looking at only the most recent 15 years. There are three possible reasons for this: Given the natural variability in pollutant concentrations, trends often take a considerable length of • time to b e discernible as statistically significant. Monitoring became less frequent and regular in the latter years of the Milestone program – there is • making trends more difficult to ascertain. simply less data to work with – • In cases where overall decreasing p ollutant levels have been found, while this is not clear from this data, it may be the case that the largest reductions came in the earlier years of the MPCA’s efforts from the relatively more easily attained limitations on municipal and industrial point sources. In aining problems are largely nonpoint in nature, more diffuse, and more difficult to contrast, the rem -economic, and technical standpoint. resolve from a regulatory, socio Nevertheless, the combined results from the Milestone sites give an accurate and useful picture of overall conditions and changes in pollutant levels across the state of Minnesota. As such, they are indicative of past and current successes as well as future challenges.

6 4 Long -Term Water Quality Trends at 80 Minnesota Milestone Sites 100% 90% 80% 70% 60% No Trend 50% Increasing Pollutant Trend Decreasing Pollutant Trend 40% Percent of Sites Showing Trend 30% 20% 10% 0% Chloride Biochemical Ammonia Total Phosphorus Total Suspended Nitrite/Nitrate Oxygen Demand Solids

7 5 Recent 15- Year Water Quality Trends at 80 Minnesota Milestone Sites 100% 90% 80% 70% 60% No Trend 50% Increasing Pollutant Trend Decreasing Pollutant Trend 40% Percent of Sites Showing Trend 30% 20% 10% 0% Chloride Biochemical Ammonia Total Phosphorus Total Suspended Nitrite/Nitrate Oxygen Demand Solids

8 6 Water Quality Trends at 80 Minnesota Milestone Sites Long-Term Trend Recent 10-Year Median Concentration Recent 15-Year Trend Total Biochemical Total Biochemical / NO Total Suspended Nitrite/ Suspended Oxygen Total Oxygen Nitrite/ 2 Chloride Cl Solids BOD Chloride TSS TP Solids Ammonia Demand Ammonia Nitrate Phosphorus Demand Phosphorus Nitrate Station River NH NO 3 3 Red River of the North Basin RE-536 increase increase increase no trend no trend no trend increase 74 0.3 0.2 <0.05 3 15 no trend increase no trend decrease Red no trend decrease increase no trend no trend no trend no trend no trend 120 0.3 0.3 <0.05 2 17 increase no trend increase RE-452 Red no trend no trend no trend 0.05 no trend no trend no trend decrease no trend 230 0.5 0.4 decrease 2 18 Red RE-403 increase decrease increase decrease no trend <0.05 decrease no trend no trend no trend decrease no trend 160 0.4 0.5 no trend 1 19 decrease increase no trend increase RE-298 Red increase decrease increase no trend no trend no trend no trend no trend little data 13 0.1 0.06 <0.05 1 10 Otter Tail OT-49 no trend decrease no trend no trend decrease decrease no trend no trend no trend no trend no trend no trend 64 0.1 0.06 <0.05 1 10 Otter Tail OT-1 decrease decrease increase increase <0.05 decrease no trend no trend no trend no trend no trend 79 0.2 0.1 no trend 2 7 no trend increase Red Lake RL-23 no trend decrease increase decrease increase no trend no trend no trend no trend no trend no trend 98 0.2 Red Lake <0.05 1 7 RL-0.2 no trend decrease increase decrease 0.1 decrease no trend no trend decrease no trend no trend no trend decrease 70 decrease <0.05 <0.05 2 14 no trend decrease no trend SK-1.8 Snake 0.3 no trend decrease no trend no trend no trend no trend no trend no trend no trend 30 0.2 0.08 <0.05 2 17 Two Rivers TMB-19 no trend decrease no trend Rainy River Basin increase decrease no trend no trend no trend no trend no trend no trend little data 2 0.02 <0.05 <0.05 1 2 decrease Rainy RA-83 decrease no trend no trend decrease no trend no trend no trend no trend no trend little data 4 0.03 <0.05 <0.05 1 3 decrease RA-12 Rainy decrease increase increase <0.05 no trend decrease no trend no trend no trend little data 3 0.02 <0.05 no trend 1 2 no trend no trend Kawishiwi KA-10 decrease decrease no trend decrease increase no trend no trend no trend no trend no trend little data 12 0.1 Little Fork <0.05 1 4 LF-0.5 no trend decrease no trend no trend 0.06 decrease no trend no trend no trend no trend no trend increase little data 12 decrease <0.05 <0.05 1 2 no trend decrease decrease BF-0.5 Big Fork 0.05 no trend no trend decrease no trend no trend no trend no trend no trend little data 9 Rapid <0.05 <0.05 1 1 RP-0.1 decrease decrease no trend 0.05 no trend decrease little data no trend no trend no trend no trend no trend little data 4 0.03 <0.05 <0.05 1 2 Winter Road WR-1 no trend no trend no trend Lake Superior Basin 0.01 no trend no trend decrease no trend no trend no trend little data 2 no trend <0.05 <0.05 <0.5 1 decrease no trend no trend Brule BRU-0.4 no trend no trend no trend no trend no trend no trend no trend no trend no trend little data Poplar 0.02 0.05 <0.05 0.7 2 POP-0 no trend decrease no trend 3 increase decrease increase no trend no trend increase no trend no trend little data no trend 0.01 0.4 <0.05 0.6 7 decrease decrease BV-4 Beaver 2 no trend no trend decrease no trend no trend no trend no trend no trend no trend Knife 2 0.01 <0.05 <0.05 0.5 5 KN-0.2 decrease decrease little data decrease no trend no trend increase no trend no trend no trend no trend no trend little data 2 0.02 <0.05 <0.05 0.8 11 Lester LE-0.2 decrease no trend no trend decrease little data no trend decrease decrease no trend no trend little data 4 0.03 <0.05 <0.05 0.8 6 SL-110 St. Louis decrease decrease decrease decrease decrease no trend no trend no trend no trend no trend little data 4 0.04 0.06 <0.05 1 5 decrease SL-38 St. Louis decrease no trend increase <0.05 decrease no trend no trend no trend no trend little data 5 0.04 0.09 decrease 1 7 decrease decrease St. Louis SL-9 decrease decrease no trend decrease decrease no trend no trend increase increase no trend increase 5 0.05 St. Louis 0.07 1 11 SLB-1 decrease decrease increase decrease 0.2 Upper Mississippi River Basin decrease no trend no trend increase no trend no trend no trend little data 2 no trend <0.05 <0.05 1 2 decrease decrease UM-1365 Mississippi no trend 0.05 decrease decrease increase no trend no trend no trend no trend no trend little data Mississippi 0.03 <0.05 <0.05 1 7 UM-1292 decrease decrease no trend 1 no trend decrease increase no trend no trend no trend no trend no trend little data 2 0.03 <0.05 <0.05 1 3 Mississippi UM-1186 decrease decrease decrease <0.05 decrease decrease decrease no trend no trend no trend little data 3 0.04 no trend <0.05 1 5 no trend decrease Mississippi UM-1172 decrease decrease decrease decrease increase no trend no trend no trend no trend no trend little data 5 Mississippi 0.2 <0.05 1 9 UM-982 decrease decrease increase 0.05 increase decrease increase no trend no trend increase no trend no trend little data decrease 0.08 0.2 <0.05 1 9 decrease decrease UM-930 Mississippi 7 increase decrease decrease increase no trend no trend increase no trend no trend Mississippi 8 0.07 0.2 <0.05 2 11 UM-914 no trend decrease little data decrease decrease decrease no trend decrease no trend increase no trend no trend little data 8 0.09 0.4 <0.05 2 12 Mississippi UM-895 decrease increase increase decrease increase decrease no trend no trend no trend no trend little data 19 0.1 0.3 <0.05 2 25 UM-859 Mississippi decrease decrease decrease 3 decrease decrease decrease no trend no trend no trend little data 68 0.2 increase <0.05 2 25 increase decrease Mississippi UM-840 no trend decrease decrease decrease increase decrease decrease increase no trend decrease little data 48 Mississippi 3 0.08 2 31 UM-826 no trend decrease increase 0.2 42 28 3 0.05 2 0.2 increase no trend little data decrease no trend decrease decrease no trend decrease decrease decrease UM-815 Mississippi increase increase decrease decrease increase no trend no trend no trend no trend decrease little data Long Prairie 0.09 0.1 <0.05 1 25 LPR-3 decrease no trend 3 decrease decrease no trend increase no trend no trend increase no trend no trend little data 9 0.2 0.4 <0.05 2 32 Sauk SA-0 no trend increase 0.3 increase increase decrease no trend no trend no trend no trend no trend 51 no trend 0.7 <0.05 6 33 no trend no trend Crow CR-0.2 no trend increase decrease decrease increase no trend no trend no trend no trend no trend little data Rum 0.1 0.2 <0.05 2 12 RUM-34 decrease decrease 14 decrease no trend decrease increase no trend no trend no trend no trend decrease increase 8 0.1 0.1 <0.05 2 18 decrease RUM-0.6 Rum little data

9 7 Water Quality Trends at 80 Minnesota Milestone Sites Recent 15-Year Trend Long-Term Trend Recent 10-Year Median Concentration Total Biochemical Total Biochemical / NO Oxygen Suspended Total Nitrite/ Total Nitrite/ Oxygen Suspended 2 TSS TP Chloride Solids Solids BOD Cl Chloride Phosphorus Demand Demand Phosphorus Ammonia Ammonia Nitrate Nitrate NH River Station NO 3 3 Minnesota River Basin decrease decrease no trend little data decrease decrease decrease no trend increase little data MI-212 decrease Minnesota no trend 4 0.2 0.2 54 22 <0.05 0.2 decrease increase no trend no trend no trend no trend Minnesota little data 68 decrease 0.7 <0.05 4 26 no trend decrease no trend MI-196 increase no trend decrease decrease increase decrease decrease no trend Minnesota increase little data 79 0.2 1 <0.05 4 29 MI-133 decrease decrease no trend decrease decrease decrease increase decrease decrease no trend no trend increase no trend 87 0.2 4 <0.05 4 29 no trend MI-88 Minnesota little data decrease no trend decrease decrease increase decrease decrease no trend no trend increase little data 81 0.2 3 <0.05 4 32 MI-64 Minnesota decrease no trend no trend decrease no trend little data decrease decrease no trend no trend no trend little data 71 0.2 7 <0.05 3 55 Minnesota MI-3.5 decrease decrease no trend decrease decrease increase decrease no trend no trend no trend no trend no trend 73 0.2 0.3 <0.05 2 13 Pomme de Terre PT-10 increase little data decrease decrease decrease increase decrease decrease no trend no trend decrease increase 26 0.1 0.3 <0.05 2 18 YM-0.5 Yellow Medicine decrease decrease no trend no trend decrease decrease no trend no trend increase no trend no trend no trend little data 51 0.3 2 <0.05 4 71 Redwood RWR-1 no trend Cottonwood no trend decrease decrease increase decrease decrease no trend no trend increase little data 65 0.1 3 <0.05 5 29 CO-0.5 decrease no trend decrease decrease decrease no trend decrease no trend increase no trend no trend little data 38 0.3 6 0.08 4 79 Center Creek CEC-23.2 increase decrease little data decrease decrease increase decrease no trend no trend no trend no trend no trend 52 0.2 6 <0.05 2 42 Watonwan WA-6 no trend little data no trend decrease decrease increase decrease decrease no trend no trend increase no trend 62 0.2 7 <0.05 5 31 Blue Earth BE-0 decrease St. Croix River Basin decrease decrease no trend no trend decrease increase no trend decrease no trend no trend no trend little data 4 0.03 <0.05 <0.05 1 5 St. Croix SC-111 decrease SC-23 increase no trend decrease increase no trend no trend no trend no trend no trend little data 10 0.1 0.1 <0.05 2 7 St. Croix decrease no trend decrease decrease decrease increase no trend no trend no trend no trend no trend increase 5 0.1 0.2 <0.05 1 7 SC-17 decrease St. Croix decrease decrease no trend decrease decrease increase no trend no trend increase no trend Kettle little data 3 0.05 0.1 <0.05 1 8 KE-11 no trend SN-10 no trend no trend decrease no trend increase no trend no trend no trend no trend no trend little data 7 0.09 0.06 0.06 2 8 Snake no trend SUN-5 decrease no trend increase no trend increase no trend decrease no trend increase no trend no trend little data 8 Sunrise 2 <0.05 1 31 0.1 Lower Mississippi River Basin UM-738 decrease increase decrease decrease increase decrease no trend increase no trend decrease little data 17 0.1 1 <0.05 2 23 Mississippi decrease decrease Mississippi decrease decrease increase no trend no trend increase no trend no trend little data 21 0.2 2 <0.05 2 18 decrease UM-714 increase 20 decrease decrease no trend no trend no trend increase no trend no trend little data decrease 0.2 0.9 <0.05 2 18 no trend increase Mississippi UM-698 decrease no trend decrease increase little data decrease decrease decrease no trend no trend Vermillion 12 0.5 5 <0.05 1 52 VR-32.5 decrease little data decrease no trend decrease decrease increase no trend no trend no trend no trend decrease little data 23 0.3 4 <0.05 1 30 ST-18 Straight no trend decrease decrease increase decrease decrease increase no trend no trend increase no trend Cannon little data 14 0.2 4 <0.05 2 28 CA-13 no trend ZSF-5.7 decrease increase decrease decrease increase decrease no trend no trend no trend no trend little data 16 0.2 7 <0.05 2 54 Zumbro decrease little data decrease decrease decrease increase no trend no trend increase no trend no trend increase 16 0.4 11 <0.05 1 43 WWR-26 no trend Whitewater decrease decrease increase decrease decrease increase decrease no trend increase no trend Garvin Brook little data 23 0.1 2 <0.05 1 13 GB-4.5 no trend RT-3 decrease increase decrease decrease increase decrease no trend increase no trend decrease little data 58 0.1 4 <0.05 1 13 Root no trend Missouri River Basin RO-0 decrease decrease Rock decrease decrease increase no trend no trend increase no trend no trend little data 30 0.1 5 <0.05 2 26 increase Pipestone Creek no trend decrease increase decrease decrease no trend decrease no trend no trend no trend no trend little data 39 0.2 4 0.07 5 26 PC-1.5 Des Moines River Basin W Fk Des Moines no trend increase decrease no trend no trend no trend no trend no trend no trend no trend little data 71 0.2 3 <0.05 8 38 WDM-3 no trend decrease no trend no trend decrease decrease no trend no trend no trend no trend no trend EDM-6 little data 20 0.2 11 <0.05 5 36 E Fk Des Moines decrease no trend OK-25.6 increase decrease decrease little data decrease decrease no trend no trend no trend little data 32 5 42 <0.05 2 175 Okabena Creek decrease Cedar River Basin CD-24 decrease decrease increase decrease decrease no trend no trend no trend no trend no trend no trend little data 11 0.2 8 <0.05 1 20 Cedar 34 0.2 9 <0.05 2 28 CD-10 no trend no trend increase no trend no trend little data decrease Cedar increase decrease decrease no trend decrease no trend SR-1.2 increase decrease decrease increase no trend no trend no trend no trend decrease little data 54 0.4 2 <0.05 7 43 Shell Rock decrease Milestone Sites (Having Sufficient Data) Showing: 63% 34% 0% 73% 84% 4% Decreasing Pollutant Trend 24% 4% 0% 9% 8% 85% 4% 1% 56% 0% 3% 68% Increasing Pollutant Trend 4% 24% 1% 10% 15% 0% 65% No Trend 44% 28% 14% 28% 15% 73% 73% 99% 81% 77% 34%

10 8 Long-Term Water QualityTrends At Minnesota Milestone Sites Total Suspended Solids RA-12 " * # * # TMB-19 " RA-83 * # WR-1 RP-0.1 * # " SK-1.8 " BF-0.5 LF-0.5 RE-298 # RL-0.2 * KA-10 " * # " " RL-23 BRU-0.4 " POP-0 * # * # UM-1292 * # * # * # SL-110 * # UM-1186 # * RE-403 UM-1172 BV-4 UM-1365 * # KN-0.2 RE-452 * # * # # * SL-38 LE-0.2 * # * # SLB-1 SL-9 RE-536 OT-49 " * # * # Pollutant Trend LPR-3 " * # OT-1 Decrease * # * # UM-982 * KE-11 # SC-111 Increase # * SN-10 " No Trend " * # UM-930 * Rivers # SA-0 * RUM-34 # " UM-914 SUN-5 " Basin Boundaries * # CR-0.2 * # UM-895 PT-10 " " RUM-0.6 Milestone site designations refer * # * # SC-23 * # UM-859 to rivers' names (see table at bottom) SC-17 and approximate distances in miles UM-840 " from rivers' mouths UM-826 MI-3.5 " * # * # " UM-815 YM-0.5 MI-212 * # * # VR-32.5 * # * # * # MI-196 " MI-64 RWR-1 CA-13 MI-88 CO-0.5 * # " " * # UM-738 * # * # BE-0 MI-133 * # " ZSF-5.7 GB-4.5 * # * # PC-1.5 " WA-6 ST-18 UM-714 " WWR-26 * # UM-698 * # " * RT-3 # OK-25.6 ́ CD-24 * CEC-23.2 # " RO-0 * # * # SR-1.2 WDM-3 CD-10 * # EDM-6 " GB - Garvin Brook PC - Pipestone Creek BE - Blue Earth River TMB - Two Rivers (Middle Branch) RWR - Redwood River POP - Poplar River KA - Kawishiwi River BF - Big Fork River SA - Sauk River UM - Mississippi River PT - Pomme De Terre River KE - Kettle River SC - St. Croix River VR - Vermillion River BRU - Brule River BV - Beaver River SK - Snake River WA - Watonwan River RA - Rainy River KN - Knife River CA - Cannon River SL - St. Louis River WDM - Des Moines River (W Fork) LE - Lester River RE - Red River LF - Little Fork River SLB - St. Louis Bay CD - Cedar River WR - Winter Road River RL - Red Lake River CEC - Center Creek SN - Snake River LPR - Long Prairie River RO - Rock River WWR - Whitewater River SR - Shell Rock River YM - Yellow Medicine River MI - Minnesota River RP - Rapid River CO - Cottonwood River RT - Root River ZSF - Zumbro River (S Fork) OK - Okabena Creek CR - Crow River ST - Straight River OT - Otter Tail River RUM - Rum River SUN - Sunrise River EDM - De Moines River (E Fork)

11 9 Long-Term Water QualityTrends At Minnesota Milestone Sites Total Phosphorus * # RA-12 * # * # TMB-19 " RA-83 * # WR-1 RP-0.1 * # * # * # SK-1.8 BF-0.5 LF-0.5 RE-298 * # " RL-0.2 * # * # KA-10 * # RL-23 BRU-0.4 * # POP-0 * # * # UM-1292 * # * # * # * # SL-110 * # UM-1186 RE-403 UM-1172 BV-4 UM-1365 * # KN-0.2 RE-452 * # * # " SL-38 LE-0.2 * # * # SLB-1 SL-9 RE-536 OT-49 " * # * # Pollutant Trend LPR-3 " * # OT-1 Decrease * # * # UM-982 * KE-11 # SC-111 Increase # * SN-10 " No Trend " * # * # UM-930 Rivers SA-0 * RUM-34 # * # " UM-914 SUN-5 Basin Boundaries * # * # CR-0.2 * # UM-895 PT-10 " RUM-0.6 Milestone site designations refer * # * # SC-23 * # UM-859 to rivers' names (see table at bottom) * # SC-17 and approximate distances in miles UM-840 * # * # from rivers' mouths UM-826 MI-3.5 * # * # UM-815 YM-0.5 MI-212 * # * # VR-32.5 * # * # * # MI-196 " MI-64 RWR-1 CA-13 MI-88 CO-0.5 * # * # * # * # * # UM-738 * # * # BE-0 MI-133 * # * # ZSF-5.7 GB-4.5 * # * # PC-1.5 WA-6 ST-18 UM-714 " WWR-26 * # * # UM-698 * # RT-3 * # OK-25.6 ́ CD-24 * CEC-23.2 " # RO-0 * # * # SR-1.2 WDM-3 CD-10 * # EDM-6 " GB - Garvin Brook PC - Pipestone Creek RWR - Redwood River TMB - Two Rivers (Middle Branch) BE - Blue Earth River UM - Mississippi River SA - Sauk River BF - Big Fork River KA - Kawishiwi River POP - Poplar River PT - Pomme De Terre River BRU - Brule River SC - St. Croix River KE - Kettle River VR - Vermillion River KN - Knife River BV - Beaver River WA - Watonwan River SK - Snake River RA - Rainy River LE - Lester River RE - Red River WDM - Des Moines River (W Fork) SL - St. Louis River CA - Cannon River LF - Little Fork River WR - Winter Road River SLB - St. Louis Bay RL - Red Lake River CD - Cedar River CEC - Center Creek RO - Rock River SN - Snake River LPR - Long Prairie River WWR - Whitewater River RP - Rapid River CO - Cottonwood River SR - Shell Rock River YM - Yellow Medicine River MI - Minnesota River CR - Crow River RT - Root River ST - Straight River OK - Okabena Creek ZSF - Zumbro River (S Fork) EDM - De Moines River (E Fork) RUM - Rum River SUN - Sunrise River OT - Otter Tail River

12 10 Long-Term Water QualityTrends At Minnesota Milestone Sites Nitrite/Nitrate " RA-12 TMB-19 # * " RA-83 " WR-1 RP-0.1 # * " " SK-1.8 " BF-0.5 LF-0.5 RE-298 # RL-0.2 * KA-10 # * # * " " RL-23 BRU-0.4 " POP-0 " UM-1292 " SL-110 " # * UM-1186 # * RE-403 " UM-1172 BV-4 UM-1365 " KN-0.2 RE-452 " # * SL-38 LE-0.2 " " # * SLB-1 " SL-9 RE-536 OT-49 # * Pollutant Trend LPR-3 # * # * " * # OT-1 Decrease UM-982 KE-11 # * SC-111 " " Increase # * SN-10 " No Trend " UM-930 Rivers SA-0 # * RUM-34 # * # * # * UM-914 SUN-5 # * Basin Boundaries CR-0.2 # * UM-895 PT-10 # * # * RUM-0.6 # * Milestone site designations refer SC-23 UM-859 to rivers' names (see table at bottom) # * # * SC-17 and approximate distances in miles # * UM-840 # * from rivers' mouths UM-826 MI-3.5 " # * UM-815 YM-0.5 MI-212 # * # * VR-32.5 " " MI-196 " # * " MI-64 " RWR-1 CA-13 MI-88 CO-0.5 " " " UM-738 BE-0 MI-133 " # * ZSF-5.7 GB-4.5 " # * # * PC-1.5 " WA-6 ST-18 UM-714 # * # * # * WWR-26 UM-698 # * RT-3 # * OK-25.6 ́ CD-24 # * CEC-23.2 # * # * RO-0 SR-1.2 WDM-3 CD-10 # * EDM-6 " # * # * # * RWR - Redwood River TMB - Two Rivers (Middle Branch) PC - Pipestone Creek GB - Garvin Brook BE - Blue Earth River UM - Mississippi River POP - Poplar River BF - Big Fork River SA - Sauk River KA - Kawishiwi River VR - Vermillion River PT - Pomme De Terre River BRU - Brule River KE - Kettle River SC - St. Croix River KN - Knife River SK - Snake River WA - Watonwan River BV - Beaver River RA - Rainy River CA - Cannon River WDM - Des Moines River (W Fork) SL - St. Louis River LE - Lester River RE - Red River LF - Little Fork River WR - Winter Road River RL - Red Lake River SLB - St. Louis Bay CD - Cedar River LPR - Long Prairie River WWR - Whitewater River SN - Snake River RO - Rock River CEC - Center Creek SR - Shell Rock River RP - Rapid River YM - Yellow Medicine River MI - Minnesota River CO - Cottonwood River CR - Crow River ZSF - Zumbro River (S Fork) OK - Okabena Creek ST - Straight River RT - Root River SUN - Sunrise River RUM - Rum River EDM - De Moines River (E Fork) OT - Otter Tail River

13 11 Long-Term Water QualityTrends At Minnesota Milestone Sites Ammonia " RA-12 TMB-19 " " RA-83 " WR-1 RP-0.1 * # " * # " SK-1.8 BF-0.5 LF-0.5 RE-298 * # * # RL-0.2 KA-10 " " " RL-23 BRU-0.4 " POP-0 * # * # UM-1292 * # * # SL-110 " " * # UM-1186 RE-403 UM-1172 BV-4 UM-1365 KN-0.2 RE-452 " * # " SL-38 LE-0.2 * " # * # SLB-1 SL-9 RE-536 OT-49 " * # * # Pollutant Trend LPR-3 " * # OT-1 Decrease * # UM-982 KE-11 * # " SC-111 Increase # * * # SN-10 No Trend " * # * # Rivers UM-930 SA-0 RUM-34 * # * # " UM-914 SUN-5 Basin Boundaries * # * # CR-0.2 UM-895 PT-10 " RUM-0.6 " Milestone site designations refer * # SC-23 * # to rivers' names (see table at bottom) UM-859 " * SC-17 # and approximate distances in miles UM-840 * # * # from rivers' mouths UM-826 MI-3.5 * # * # UM-815 YM-0.5 MI-212 * # * # VR-32.5 * # * # * # * # MI-196 MI-64 RWR-1 CA-13 MI-88 CO-0.5 * # * # * # * * # # UM-738 * # * # BE-0 MI-133 * # * # ZSF-5.7 * GB-4.5 # * # * # PC-1.5 WA-6 ST-18 UM-714 WWR-26 * # * # UM-698 * # * RT-3 # * ́ # OK-25.6 CD-24 * CEC-23.2 # RO-0 * # * # * # SR-1.2 WDM-3 CD-10 * # EDM-6 GB - Garvin Brook PC - Pipestone Creek TMB - Two Rivers (Middle Branch) BE - Blue Earth River RWR - Redwood River UM - Mississippi River BF - Big Fork River KA - Kawishiwi River POP - Poplar River SA - Sauk River PT - Pomme De Terre River BRU - Brule River SC - St. Croix River VR - Vermillion River KE - Kettle River RA - Rainy River SK - Snake River BV - Beaver River KN - Knife River WA - Watonwan River LE - Lester River RE - Red River SL - St. Louis River CA - Cannon River WDM - Des Moines River (W Fork) WR - Winter Road River CD - Cedar River LF - Little Fork River SLB - St. Louis Bay RL - Red Lake River CEC - Center Creek SN - Snake River RO - Rock River WWR - Whitewater River LPR - Long Prairie River SR - Shell Rock River YM - Yellow Medicine River RP - Rapid River MI - Minnesota River CO - Cottonwood River CR - Crow River ST - Straight River OK - Okabena Creek ZSF - Zumbro River (S Fork) RT - Root River SUN - Sunrise River EDM - De Moines River (E Fork) OT - Otter Tail River RUM - Rum River

14 12 Long-Term Water QualityTrends At Minnesota Milestone Sites Biochemical Oxygen Demand * # RA-12 * # * # TMB-19 RA-83 " * # WR-1 RP-0.1 * # * # * # SK-1.8 BF-0.5 LF-0.5 RE-298 * # * # RL-0.2 * # KA-10 " " RL-23 BRU-0.4 " POP-0 * # * # UM-1292 * # * # * # * # SL-110 * # UM-1186 RE-403 UM-1172 BV-4 UM-1365 * # * # KN-0.2 RE-452 * # SL-38 LE-0.2 * # " * # SLB-1 SL-9 RE-536 * # OT-49 * # * # * # Pollutant Trend LPR-3 * # OT-1 Decrease * # * UM-982 # * KE-11 # SC-111 Increase # * SN-10 " No Trend " * # UM-930 Rivers SA-0 * RUM-34 # " * # # * UM-914 SUN-5 Basin Boundaries * # * # CR-0.2 * # UM-895 PT-10 " RUM-0.6 Milestone site designations refer * # * # SC-23 * # UM-859 to rivers' names (see table at bottom) * # SC-17 and approximate distances in miles UM-840 * # from rivers' mouths UM-826 MI-3.5 " * # * # UM-815 YM-0.5 MI-212 VR-32.5 * # # * * # * # " * # MI-196 MI-64 RWR-1 CA-13 MI-88 CO-0.5 * # * # * # * * # # UM-738 * # * # BE-0 MI-133 * # * # ZSF-5.7 GB-4.5 * # * # * # PC-1.5 WA-6 ST-18 UM-714 WWR-26 * # * # UM-698 * # * RT-3 # * # OK-25.6 ́ CD-24 * CEC-23.2 # RO-0 * # * # SR-1.2 WDM-3 CD-10 * # EDM-6 " TMB - Two Rivers (Middle Branch) BE - Blue Earth River PC - Pipestone Creek GB - Garvin Brook RWR - Redwood River POP - Poplar River KA - Kawishiwi River UM - Mississippi River SA - Sauk River BF - Big Fork River VR - Vermillion River BRU - Brule River SC - St. Croix River PT - Pomme De Terre River KE - Kettle River RA - Rainy River BV - Beaver River KN - Knife River WA - Watonwan River SK - Snake River LE - Lester River SL - St. Louis River RE - Red River CA - Cannon River WDM - Des Moines River (W Fork) LF - Little Fork River SLB - St. Louis Bay CD - Cedar River WR - Winter Road River RL - Red Lake River CEC - Center Creek WWR - Whitewater River RO - Rock River SN - Snake River LPR - Long Prairie River MI - Minnesota River RP - Rapid River SR - Shell Rock River CO - Cottonwood River YM - Yellow Medicine River ZSF - Zumbro River (S Fork) ST - Straight River CR - Crow River OK - Okabena Creek RT - Root River SUN - Sunrise River EDM - De Moines River (E Fork) OT - Otter Tail River RUM - Rum River

15 13 Long-Term Water QualityTrends At Minnesota Milestone Sites Chloride " RA-12 * # TMB-19 # * % RA-83 WR-1 RP-0.1 " # * " SK-1.8 " BF-0.5 LF-0.5 RE-298 RL-0.2 # * KA-10 # * # * " " RL-23 BRU-0.4 " POP-0 # * UM-1292 % SL-110 " # * UM-1186 " RE-403 # * UM-1172 BV-4 UM-1365 " KN-0.2 RE-452 " # * SL-38 LE-0.2 * # # * # * * # SLB-1 SL-9 RE-536 OT-49 # * Pollutant Trend LPR-3 # * # * # * * # OT-1 Decrease UM-982 KE-11 # * SC-111 # # * * Increase # * SN-10 # * No Trend " UM-930 Insufficient Data SA-0 % # * RUM-34 # * " # * UM-914 Rivers SUN-5 # * CR-0.2 " UM-895 PT-10 # # * Basin Boundaries * RUM-0.6 # * SC-23 UM-859 # * # * SC-17 # * UM-840 # * UM-826 Milestone site designations refer MI-3.5 % # * to rivers' names (see table at bottom) UM-815 YM-0.5 MI-212 # * # * and approximate distances in miles VR-32.5 % % from rivers' mouths MI-196 " # * # * MI-64 # * RWR-1 CA-13 MI-88 CO-0.5 # * # * # * UM-738 BE-0 MI-133 # * # * ZSF-5.7 GB-4.5 # * # * # * PC-1.5 # * WA-6 ST-18 UM-714 " # * # * WWR-26 UM-698 " RT-3 # * OK-25.6 ́ CD-24 " CEC-23.2 % " RO-0 SR-1.2 WDM-3 CD-10 " EDM-6 " # " * # * GB - Garvin Brook TMB - Two Rivers (Middle Branch) PC - Pipestone Creek BE - Blue Earth River RWR - Redwood River KA - Kawishiwi River BF - Big Fork River SA - Sauk River POP - Poplar River UM - Mississippi River PT - Pomme De Terre River SC - St. Croix River VR - Vermillion River BRU - Brule River KE - Kettle River SK - Snake River RA - Rainy River WA - Watonwan River KN - Knife River BV - Beaver River CA - Cannon River LE - Lester River SL - St. Louis River WDM - Des Moines River (W Fork) RE - Red River WR - Winter Road River CD - Cedar River LF - Little Fork River SLB - St. Louis Bay RL - Red Lake River WWR - Whitewater River SN - Snake River RO - Rock River LPR - Long Prairie River CEC - Center Creek SR - Shell Rock River RP - Rapid River YM - Yellow Medicine River CO - Cottonwood River MI - Minnesota River OK - Okabena Creek ST - Straight River CR - Crow River ZSF - Zumbro River (S Fork) RT - Root River RUM - Rum River EDM - De Moines River (E Fork) OT - Otter Tail River SUN - Sunrise River

16 14 Recent 15-Year Water QualityTrends At Minnesota Milestone Sites Total Suspended Solids RA-12 " TMB-19 " " RA-83 " WR-1 RP-0.1 " " " SK-1.8 " BF-0.5 LF-0.5 RE-298 " RL-0.2 KA-10 " " " " RL-23 BRU-0.4 " POP-0 " UM-1292 " SL-110 " " * # UM-1186 " RE-403 " UM-1172 BV-4 UM-1365 KN-0.2 RE-452 " " SL-38 LE-0.2 " " * # " SLB-1 SL-9 RE-536 OT-49 # * Pollutant Trend LPR-3 " " " * # OT-1 Decrease UM-982 KE-11 " SC-111 " " Increase # * SN-10 " No Trend " UM-930 * Rivers # " SA-0 RUM-34 " " UM-914 SUN-5 " Basin Boundaries * # * # * # CR-0.2 UM-895 PT-10 RUM-0.6 " Milestone site designations refer * # SC-23 UM-859 to rivers' names (see table at bottom) " * # SC-17 " and approximate distances in miles UM-840 * # * # from rivers' mouths UM-826 MI-3.5 * # * # UM-815 YM-0.5 MI-212 * # * # VR-32.5 * # MI-196 " " " MI-64 RWR-1 CA-13 MI-88 CO-0.5 * # * # * # * # * # UM-738 * # BE-0 MI-133 * # * # ZSF-5.7 GB-4.5 * " # PC-1.5 WA-6 ST-18 UM-714 " " WWR-26 * # UM-698 " * RT-3 # * # OK-25.6 ́ CD-24 " CEC-23.2 RO-0 SR-1.2 WDM-3 CD-10 " EDM-6 " " " " BE - Blue Earth River PC - Pipestone Creek TMB - Two Rivers (Middle Branch) RWR - Redwood River GB - Garvin Brook KA - Kawishiwi River POP - Poplar River BF - Big Fork River SA - Sauk River UM - Mississippi River PT - Pomme De Terre River BRU - Brule River SC - St. Croix River VR - Vermillion River KE - Kettle River KN - Knife River SK - Snake River WA - Watonwan River RA - Rainy River BV - Beaver River SL - St. Louis River WDM - Des Moines River (W Fork) CA - Cannon River LE - Lester River RE - Red River WR - Winter Road River LF - Little Fork River SLB - St. Louis Bay RL - Red Lake River CD - Cedar River RO - Rock River CEC - Center Creek WWR - Whitewater River SN - Snake River LPR - Long Prairie River SR - Shell Rock River RP - Rapid River YM - Yellow Medicine River MI - Minnesota River CO - Cottonwood River OK - Okabena Creek CR - Crow River ST - Straight River ZSF - Zumbro River (S Fork) RT - Root River OT - Otter Tail River EDM - De Moines River (E Fork) RUM - Rum River SUN - Sunrise River

17 15 Recent15-Year Water QualityTrends At Minnesota Milestone Sites Total Phosphorus RA-12 " TMB-19 " " RA-83 " WR-1 RP-0.1 " * # " " SK-1.8 BF-0.5 LF-0.5 RE-298 " RL-0.2 * # KA-10 " * # " RL-23 BRU-0.4 " POP-0 " * # UM-1292 SL-110 " # * * # UM-1186 " RE-403 " UM-1172 BV-4 UM-1365 KN-0.2 RE-452 " " SL-38 LE-0.2 " " " SLB-1 " SL-9 RE-536 OT-49 # * Pollutant Trend LPR-3 " " " * # OT-1 Decrease * # UM-982 KE-11 " SC-111 " Increase # * SN-10 " No Trend " UM-930 Rivers " SA-0 RUM-34 " " " UM-914 SUN-5 " Basin Boundaries CR-0.2 " UM-895 PT-10 " " RUM-0.6 " Milestone site designations refer SC-23 UM-859 to rivers' names (see table at bottom) " " * # SC-17 " and approximate distances in miles UM-840 * # * # from rivers' mouths UM-826 MI-3.5 * # * # UM-815 YM-0.5 MI-212 * # * # VR-32.5 * # MI-196 # * " " MI-64 RWR-1 CA-13 MI-88 CO-0.5 * # * # * # * # UM-738 BE-0 MI-133 " ZSF-5.7 GB-4.5 " " " PC-1.5 " WA-6 ST-18 UM-714 " " " WWR-26 UM-698 " * RT-3 # " OK-25.6 ́ CD-24 " CEC-23.2 " RO-0 SR-1.2 WDM-3 CD-10 " EDM-6 " " " " RWR - Redwood River GB - Garvin Brook PC - Pipestone Creek TMB - Two Rivers (Middle Branch) BE - Blue Earth River KA - Kawishiwi River UM - Mississippi River BF - Big Fork River SA - Sauk River POP - Poplar River KE - Kettle River SC - St. Croix River BRU - Brule River PT - Pomme De Terre River VR - Vermillion River SK - Snake River KN - Knife River BV - Beaver River WA - Watonwan River RA - Rainy River RE - Red River SL - St. Louis River WDM - Des Moines River (W Fork) LE - Lester River CA - Cannon River CD - Cedar River RL - Red Lake River WR - Winter Road River LF - Little Fork River SLB - St. Louis Bay CEC - Center Creek LPR - Long Prairie River WWR - Whitewater River SN - Snake River RO - Rock River YM - Yellow Medicine River MI - Minnesota River RP - Rapid River CO - Cottonwood River SR - Shell Rock River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) ST - Straight River RT - Root River EDM - De Moines River (E Fork) OT - Otter Tail River RUM - Rum River SUN - Sunrise River

18 16 Recent 15-Year Water QualityTrends At Minnesota Milestone Sites Nitrite/Nitrate RA-12 " TMB-19 " " RA-83 " WR-1 RP-0.1 " " " SK-1.8 " BF-0.5 LF-0.5 RE-298 " RL-0.2 KA-10 " " " " RL-23 BRU-0.4 " POP-0 " * # UM-1292 SL-110 " # * UM-1186 " RE-403 " UM-1172 BV-4 UM-1365 " KN-0.2 RE-452 " " SL-38 LE-0.2 " " # * SLB-1 " SL-9 RE-536 OT-49 " Pollutant Trend LPR-3 " " " * # OT-1 Decrease UM-982 KE-11 " SC-111 " # * Increase # * SN-10 " No Trend " UM-930 Rivers SA-0 # * RUM-34 # * # * " UM-914 SUN-5 # * Basin Boundaries CR-0.2 # * UM-895 PT-10 " " RUM-0.6 " Milestone site designations refer SC-23 UM-859 to rivers' names (see table at bottom) " " SC-17 " and approximate distances in miles UM-840 " from rivers' mouths UM-826 MI-3.5 " # * UM-815 YM-0.5 MI-212 * " # " * # VR-32.5 MI-196 " # * " MI-64 " RWR-1 CA-13 MI-88 CO-0.5 " " " UM-738 BE-0 MI-133 " # * ZSF-5.7 GB-4.5 " " # * PC-1.5 " WA-6 ST-18 UM-714 " # * # * WWR-26 UM-698 # * RT-3 # * OK-25.6 ́ CD-24 " CEC-23.2 " # * RO-0 SR-1.2 WDM-3 CD-10 # * EDM-6 " # " * " PC - Pipestone Creek GB - Garvin Brook BE - Blue Earth River TMB - Two Rivers (Middle Branch) RWR - Redwood River BF - Big Fork River UM - Mississippi River POP - Poplar River SA - Sauk River KA - Kawishiwi River SC - St. Croix River BRU - Brule River KE - Kettle River PT - Pomme De Terre River VR - Vermillion River WA - Watonwan River KN - Knife River BV - Beaver River RA - Rainy River SK - Snake River RE - Red River SL - St. Louis River LE - Lester River WDM - Des Moines River (W Fork) CA - Cannon River CD - Cedar River RL - Red Lake River WR - Winter Road River SLB - St. Louis Bay LF - Little Fork River WWR - Whitewater River SN - Snake River LPR - Long Prairie River RO - Rock River CEC - Center Creek MI - Minnesota River SR - Shell Rock River YM - Yellow Medicine River CO - Cottonwood River RP - Rapid River OK - Okabena Creek CR - Crow River ZSF - Zumbro River (S Fork) ST - Straight River RT - Root River EDM - De Moines River (E Fork) OT - Otter Tail River RUM - Rum River SUN - Sunrise River

19 17 Recent 15-Year Water QualityTrends At Minnesota Milestone Sites Ammonia RA-12 " TMB-19 " " RA-83 " WR-1 RP-0.1 " " " SK-1.8 " BF-0.5 LF-0.5 RE-298 " RL-0.2 KA-10 " " " " RL-23 BRU-0.4 " POP-0 " UM-1292 " SL-110 " " UM-1186 " RE-403 " UM-1172 BV-4 UM-1365 " KN-0.2 RE-452 " " SL-38 LE-0.2 " " # * SLB-1 " SL-9 RE-536 OT-49 " Pollutant Trend LPR-3 " " " * # OT-1 Decrease UM-982 KE-11 " " SC-111 " Increase # * SN-10 " No Trend " UM-930 Rivers SA-0 " RUM-34 " " " UM-914 SUN-5 " Basin Boundaries CR-0.2 " UM-895 PT-10 " " RUM-0.6 " Milestone site designations refer SC-23 UM-859 to rivers' names (see table at bottom) " " SC-17 " and approximate distances in miles UM-840 " from rivers' mouths UM-826 MI-3.5 " " UM-815 YM-0.5 MI-212 " " VR-32.5 " " MI-196 " " " MI-64 " RWR-1 CA-13 MI-88 CO-0.5 " " " UM-738 BE-0 MI-133 " " ZSF-5.7 GB-4.5 " " " PC-1.5 " WA-6 ST-18 UM-714 " " " WWR-26 UM-698 " RT-3 " OK-25.6 ́ CD-24 " CEC-23.2 " " RO-0 SR-1.2 WDM-3 CD-10 " EDM-6 " " " " PC - Pipestone Creek BE - Blue Earth River GB - Garvin Brook TMB - Two Rivers (Middle Branch) RWR - Redwood River BF - Big Fork River UM - Mississippi River POP - Poplar River SA - Sauk River KA - Kawishiwi River KE - Kettle River SC - St. Croix River PT - Pomme De Terre River BRU - Brule River VR - Vermillion River WA - Watonwan River RA - Rainy River SK - Snake River BV - Beaver River KN - Knife River RE - Red River SL - St. Louis River WDM - Des Moines River (W Fork) LE - Lester River CA - Cannon River CD - Cedar River WR - Winter Road River RL - Red Lake River LF - Little Fork River SLB - St. Louis Bay CEC - Center Creek SN - Snake River WWR - Whitewater River RO - Rock River LPR - Long Prairie River MI - Minnesota River SR - Shell Rock River YM - Yellow Medicine River RP - Rapid River CO - Cottonwood River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) ST - Straight River RT - Root River EDM - De Moines River (E Fork) OT - Otter Tail River RUM - Rum River SUN - Sunrise River

20 18 Recent 15-Year Water QualityTrends At Minnesota Milestone Sites Biochemical Oxygen Demand " RA-12 TMB-19 " " RA-83 " WR-1 RP-0.1 " " # * SK-1.8 " BF-0.5 LF-0.5 RE-298 * # RL-0.2 KA-10 " " " " RL-23 BRU-0.4 " POP-0 " UM-1292 " * # SL-110 " " UM-1186 RE-403 " UM-1172 BV-4 UM-1365 " KN-0.2 RE-452 " " SL-38 LE-0.2 " " " SLB-1 " SL-9 RE-536 OT-49 " * # Pollutant Trend LPR-3 " " * # OT-1 Decrease UM-982 KE-11 " SC-111 " " Increase # * SN-10 " No Trend " UM-930 Rivers SA-0 " RUM-34 " " " UM-914 SUN-5 " Basin Boundaries CR-0.2 " * # UM-895 PT-10 " " RUM-0.6 Milestone site designations refer SC-23 UM-859 to rivers' names (see table at bottom) " " SC-17 " and approximate distances in miles UM-840 " * # from rivers' mouths UM-826 MI-3.5 " * # UM-815 YM-0.5 MI-212 " VR-32.5 " # * MI-196 " " # * MI-64 # * RWR-1 CA-13 MI-88 CO-0.5 # * # * * # # * UM-738 BE-0 MI-133 # * ZSF-5.7 GB-4.5 " " " PC-1.5 " WA-6 ST-18 UM-714 " " " WWR-26 UM-698 " RT-3 " OK-25.6 ́ CD-24 " CEC-23.2 " " RO-0 SR-1.2 WDM-3 CD-10 " EDM-6 " " " " PC - Pipestone Creek GB - Garvin Brook TMB - Two Rivers (Middle Branch) BE - Blue Earth River RWR - Redwood River KA - Kawishiwi River SA - Sauk River POP - Poplar River BF - Big Fork River UM - Mississippi River KE - Kettle River SC - St. Croix River PT - Pomme De Terre River BRU - Brule River VR - Vermillion River SK - Snake River WA - Watonwan River BV - Beaver River RA - Rainy River KN - Knife River LE - Lester River WDM - Des Moines River (W Fork) CA - Cannon River SL - St. Louis River RE - Red River CD - Cedar River RL - Red Lake River LF - Little Fork River SLB - St. Louis Bay WR - Winter Road River WWR - Whitewater River CEC - Center Creek RO - Rock River LPR - Long Prairie River SN - Snake River RP - Rapid River CO - Cottonwood River YM - Yellow Medicine River SR - Shell Rock River MI - Minnesota River OK - Okabena Creek RT - Root River ST - Straight River CR - Crow River ZSF - Zumbro River (S Fork) OT - Otter Tail River EDM - De Moines River (E Fork) RUM - Rum River SUN - Sunrise River

21 19 Recent 15-Year Water QualityTrends At Minnesota Milestone Sites Chloride RA-12 " TMB-19 % % RA-83 % WR-1 RP-0.1 % * # % % SK-1.8 BF-0.5 LF-0.5 RE-298 " RL-0.2 KA-10 " " % % RL-23 BRU-0.4 % POP-0 % UM-1292 % SL-110 % % UM-1186 " RE-403 % UM-1172 BV-4 UM-1365 % KN-0.2 RE-452 % " SL-38 LE-0.2 % % # * SLB-1 % SL-9 RE-536 OT-49 # * Pollutant Trend LPR-3 % " % * # OT-1 Decrease UM-982 KE-11 % SC-111 % % Increase # * SN-10 % No Trend " UM-930 Insufficient Data SA-0 % % RUM-34 % % % UM-914 Rivers SUN-5 % CR-0.2 % UM-895 PT-10 " " Basin Boundaries RUM-0.6 % SC-23 UM-859 % % SC-17 " UM-840 % UM-826 MI-3.5 % Milestone site designations refer % UM-815 YM-0.5 MI-212 % % to rivers' names (see table at bottom) VR-32.5 % and approximate distances in miles % MI-196 % % % from rivers' mouths MI-64 % RWR-1 CA-13 MI-88 CO-0.5 % % % UM-738 BE-0 MI-133 % % ZSF-5.7 GB-4.5 % % % PC-1.5 % WA-6 ST-18 UM-714 % % % WWR-26 UM-698 % RT-3 % OK-25.6 ́ CD-24 % CEC-23.2 % % RO-0 SR-1.2 WDM-3 CD-10 % EDM-6 % % % % RWR - Redwood River TMB - Two Rivers (Middle Branch) PC - Pipestone Creek GB - Garvin Brook BE - Blue Earth River KA - Kawishiwi River SA - Sauk River POP - Poplar River BF - Big Fork River UM - Mississippi River BRU - Brule River KE - Kettle River VR - Vermillion River PT - Pomme De Terre River SC - St. Croix River BV - Beaver River WA - Watonwan River RA - Rainy River SK - Snake River KN - Knife River WDM - Des Moines River (W Fork) CA - Cannon River SL - St. Louis River LE - Lester River RE - Red River SLB - St. Louis Bay WR - Winter Road River CD - Cedar River LF - Little Fork River RL - Red Lake River RO - Rock River LPR - Long Prairie River CEC - Center Creek SN - Snake River WWR - Whitewater River MI - Minnesota River RP - Rapid River CO - Cottonwood River YM - Yellow Medicine River SR - Shell Rock River ST - Straight River OK - Okabena Creek RT - Root River CR - Crow River ZSF - Zumbro River (S Fork) OT - Otter Tail River SUN - Sunrise River RUM - Rum River EDM - De Moines River (E Fork)

22 20 Recent 10-Year Median Pollutant Concentrations At Minnesota Milestone Sites Total Suspended Solids ' ­ RA-12 TMB-19 ' ­ ' ­ RA-83 ' ­ WR-1 RP-0.1 ' ­ ' ­ ' ­ SK-1.8 ' ­ BF-0.5 LF-0.5 RE-298 ' ­ RL-0.2 ' ­ KA-10 ' ­ ' ­ ' ­ RL-23 BRU-0.4 ' ­ POP-0 ' ­ UM-1292 ' ­ ' SL-110 ­ ' ­ ' ­ UM-1186 ' ­ RE-403 UM-1172 BV-4 UM-1365 ' ­ KN-0.2 ' ­ RE-452 ' ­ SL-38 ' LE-0.2 ­ ' ­ ' ­ SLB-1 ' ­ SL-9 RE-536 TSS mg/L OT-49 ' ­ LPR-3 ' ­ ' ­ ' ­ 0 - 4 ' ­ OT-1 UM-982 KE-11 ' ' 4 - 12 ­ ­ ' ' ­ ­ SC-111 ' 12 - 24 ­ ' ­ SN-10 24 - 60 ' ­ UM-930 ' ­ SA-0 RUM-34 ' ­ ' ­ 60+ ' ­ ' ­ UM-914 ' ­ SUN-5 CR-0.2 ' ­ Rivers UM-895 PT-10 ' ' ­ ­ RUM-0.6 ' ­ Basin Boundaries SC-23 UM-859 ' ­ ' ­ SC-17 ' ­ UM-840 ' ­ UM-826 MI-3.5 ' ­ Milestone site designations refer ' ­ UM-815 YM-0.5 MI-212 ' ­ ' ­ to rivers' names (see table at bottom) VR-32.5 ' ­ ' ­ and approximate distances in miles MI-196 ' ­ ' ­ ' ­ from rivers' mouths MI-64 ' ­ RWR-1 CA-13 MI-88 CO-0.5 ' ­ ' ­ ' ­ UM-738 BE-0 MI-133 ' ' ­ ­ ZSF-5.7 ' ­ GB-4.5 ' ­ ' ­ ' ­ PC-1.5 WA-6 ST-18 ' ­ UM-714 ' ­ ' ­ WWR-26 UM-698 ' ­ ' RT-3 ­ OK-25.6 ́ CD-24 ' ­ ' ­ CEC-23.2 ' ­ RO-0 SR-1.2 WDM-3 CD-10 ' ­ EDM-6 ' ­ ' ' ­ ­ ' ­ BE - Blue Earth River RWR - Redwood River PC - Pipestone Creek GB - Garvin Brook TMB - Two Rivers (Middle Branch) KA - Kawishiwi River SA - Sauk River BF - Big Fork River POP - Poplar River UM - Mississippi River VR - Vermillion River KE - Kettle River BRU - Brule River SC - St. Croix River PT - Pomme De Terre River BV - Beaver River KN - Knife River SK - Snake River RA - Rainy River WA - Watonwan River RE - Red River CA - Cannon River WDM - Des Moines River (W Fork) LE - Lester River SL - St. Louis River SLB - St. Louis Bay LF - Little Fork River WR - Winter Road River CD - Cedar River RL - Red Lake River RO - Rock River SN - Snake River LPR - Long Prairie River WWR - Whitewater River CEC - Center Creek MI - Minnesota River YM - Yellow Medicine River RP - Rapid River SR - Shell Rock River CO - Cottonwood River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) RT - Root River ST - Straight River EDM - De Moines River (E Fork) SUN - Sunrise River OT - Otter Tail River RUM - Rum River

23 21 Recent 10-Year Median Pollutant Concentrations At Minnesota Milestone Sites Total Phosphorus ' ­ RA-12 TMB-19 ' ­ ' ­ RA-83 ' ­ WR-1 RP-0.1 ' ­ ' ­ ' ­ SK-1.8 ' ­ BF-0.5 LF-0.5 RE-298 ' ­ RL-0.2 ' ­ KA-10 ' ­ ' ­ ' ­ RL-23 BRU-0.4 ' ­ POP-0 ' ­ UM-1292 ' ­ ' SL-110 ­ ' ­ ' ­ UM-1186 ' ­ RE-403 UM-1172 BV-4 UM-1365 ' ­ KN-0.2 ' ­ RE-452 ' ­ SL-38 ' LE-0.2 ­ ' ­ ' ­ SLB-1 ' ­ SL-9 RE-536 OT-49 ' ­ TP mg/L LPR-3 ' ­ ' ­ ' ­ OT-1 ' 0 - 0.04 ­ UM-982 KE-11 ' ­ ' ' ­ ­ SC-111 ' 0.04 - 0.10 ­ ' ­ SN-10 0.10 - 0.15 ' ­ UM-930 ' 0.15 - 0.25 ­ ' ­ SA-0 RUM-34 ' ­ ' ­ ' ­ UM-914 ' ­ SUN-5 ' 0.25+ ­ CR-0.2 ' ­ UM-895 PT-10 ' ' ­ ­ RUM-0.6 Rivers ' ­ SC-23 UM-859 ' ­ ' ­ SC-17 Basin Boundaries ' ­ UM-840 ' ­ UM-826 MI-3.5 ' ­ Milestone site designations refer ' ­ UM-815 YM-0.5 MI-212 ' ­ ' ­ to rivers' names (see table at bottom) VR-32.5 ' ­ ' ­ and approximate distances in miles MI-196 ' ­ ' ­ ' ­ from rivers' mouths MI-64 ' ­ RWR-1 CA-13 MI-88 CO-0.5 ' ­ ' ­ ' ­ UM-738 BE-0 MI-133 ' ' ­ ­ ZSF-5.7 ' ­ GB-4.5 ' ­ ' ­ ' ­ PC-1.5 WA-6 ST-18 ' ­ UM-714 ' ­ ' ­ WWR-26 UM-698 ' ­ ' RT-3 ­ OK-25.6 ́ CD-24 ' ­ ' ­ CEC-23.2 ' ­ RO-0 SR-1.2 WDM-3 CD-10 ' ­ EDM-6 ' ­ ' ' ­ ­ ' ­ BE - Blue Earth River RWR - Redwood River PC - Pipestone Creek GB - Garvin Brook TMB - Two Rivers (Middle Branch) KA - Kawishiwi River SA - Sauk River BF - Big Fork River POP - Poplar River UM - Mississippi River VR - Vermillion River KE - Kettle River BRU - Brule River SC - St. Croix River PT - Pomme De Terre River BV - Beaver River SK - Snake River KN - Knife River WA - Watonwan River RA - Rainy River LE - Lester River SL - St. Louis River CA - Cannon River WDM - Des Moines River (W Fork) RE - Red River SLB - St. Louis Bay LF - Little Fork River WR - Winter Road River CD - Cedar River RL - Red Lake River RO - Rock River SN - Snake River LPR - Long Prairie River WWR - Whitewater River CEC - Center Creek MI - Minnesota River YM - Yellow Medicine River RP - Rapid River SR - Shell Rock River CO - Cottonwood River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) RT - Root River ST - Straight River EDM - De Moines River (E Fork) SUN - Sunrise River OT - Otter Tail River RUM - Rum River

24 22 Recent 10-Year Median Pollutant Concentrations At Minnesota Milestone Sites Nitrite/Nitrate ' ­ RA-12 TMB-19 ' ­ ' ­ RA-83 ' ­ WR-1 RP-0.1 ' ­ ' ­ ' ­ SK-1.8 ' ­ BF-0.5 LF-0.5 RE-298 ' ­ RL-0.2 ' ­ KA-10 ' ­ ' ­ ' ­ RL-23 BRU-0.4 ' ­ POP-0 ' ­ UM-1292 ' ­ ' SL-110 ­ ' ­ ' ­ UM-1186 ' ­ RE-403 UM-1172 BV-4 UM-1365 ' ­ KN-0.2 ' ­ RE-452 ' ­ SL-38 ' LE-0.2 ­ ' ­ ' ­ SLB-1 ' ­ SL-9 RE-536 OT-49 ' ­ NO2 + NO3 - N mg/L LPR-3 ' ­ ' ­ ' ­ OT-1 ' 0 - 0.05 ­ UM-982 KE-11 ' ­ ' ' ­ ­ SC-111 ' 0.05 - 0.15 ­ ' ­ SN-10 0.15 - 0.5 ' ­ UM-930 ' 0.5 - 4 ­ ' ­ SA-0 RUM-34 ' ­ ' ­ ' ­ UM-914 ' ­ SUN-5 ' 4+ ­ CR-0.2 ' ­ UM-895 PT-10 ' ' ­ ­ RUM-0.6 Rivers ' ­ SC-23 UM-859 ' ­ ' ­ SC-17 Basin Boundaries ' ­ UM-840 ' ­ UM-826 MI-3.5 ' ­ Milestone site designations refer ' ­ UM-815 YM-0.5 MI-212 ' ­ ' ­ to rivers' names (see table at bottom) VR-32.5 ' ­ ' ­ and approximate distances in miles MI-196 ' ­ ' ­ ' ­ from rivers' mouths MI-64 ' ­ RWR-1 CA-13 MI-88 CO-0.5 ' ­ ' ­ ' ­ UM-738 BE-0 MI-133 ' ' ­ ­ ZSF-5.7 ' ­ GB-4.5 ' ­ ' ­ ' ­ PC-1.5 WA-6 ST-18 ' ­ UM-714 ' ­ ' ­ WWR-26 UM-698 ' ­ ' RT-3 ­ OK-25.6 ́ CD-24 ' ­ ' ­ CEC-23.2 ' ­ RO-0 SR-1.2 WDM-3 CD-10 ' ­ EDM-6 ' ­ ' ' ­ ­ ' ­ BE - Blue Earth River RWR - Redwood River PC - Pipestone Creek GB - Garvin Brook TMB - Two Rivers (Middle Branch) KA - Kawishiwi River SA - Sauk River BF - Big Fork River POP - Poplar River UM - Mississippi River VR - Vermillion River KE - Kettle River BRU - Brule River SC - St. Croix River PT - Pomme De Terre River BV - Beaver River SK - Snake River KN - Knife River WA - Watonwan River RA - Rainy River LE - Lester River SL - St. Louis River CA - Cannon River WDM - Des Moines River (W Fork) RE - Red River SLB - St. Louis Bay LF - Little Fork River WR - Winter Road River CD - Cedar River RL - Red Lake River RO - Rock River SN - Snake River LPR - Long Prairie River WWR - Whitewater River CEC - Center Creek MI - Minnesota River YM - Yellow Medicine River RP - Rapid River SR - Shell Rock River CO - Cottonwood River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) RT - Root River ST - Straight River EDM - De Moines River (E Fork) SUN - Sunrise River OT - Otter Tail River RUM - Rum River

25 23 Recent 10-Year Median Pollutant Concentrations At Minnesota Milestone Sites Biochemical Oxygen Demand ' ­ RA-12 TMB-19 ' ­ ' ­ RA-83 ' ­ WR-1 RP-0.1 ' ­ ' ­ ' ­ SK-1.8 ' ­ BF-0.5 LF-0.5 RE-298 ' ­ RL-0.2 ' ­ KA-10 ' ­ ' ­ ' ­ RL-23 BRU-0.4 ' ­ POP-0 ' ­ UM-1292 ' ­ ' SL-110 ­ ' ­ ' ­ UM-1186 ' ­ RE-403 UM-1172 BV-4 UM-1365 ' ­ KN-0.2 ' ­ RE-452 ' ­ SL-38 ' LE-0.2 ­ ' ­ ' ­ SLB-1 ' ­ SL-9 RE-536 OT-49 ' ­ BOD mg/L LPR-3 ' ­ ' ­ ' ­ OT-1 ' 0 - 0.9 ­ UM-982 KE-11 ' ­ ' ' ­ ­ SC-111 ' 0.9 - 1.2 ­ ' ­ SN-10 1.2 - 1.8 ' ­ UM-930 ' 1.8 - 2.4 ­ ' ­ SA-0 RUM-34 ' ­ ' ­ ' ­ UM-914 ' ­ SUN-5 2.4+ ' ­ CR-0.2 ' ­ UM-895 PT-10 ' ' ­ ­ RUM-0.6 Rivers ' ­ SC-23 UM-859 ' ­ ' ­ SC-17 Basin Boundaries ' ­ UM-840 ' ­ UM-826 MI-3.5 ' ­ Milestone site designations refer ' ­ UM-815 YM-0.5 MI-212 ' ­ ' ­ to rivers' names (see table at bottom) VR-32.5 ' ­ ' ­ and approximate distances in miles MI-196 ' ­ ' ­ ' ­ from rivers' mouths MI-64 ' ­ RWR-1 CA-13 MI-88 CO-0.5 ' ­ ' ­ ' ­ UM-738 BE-0 MI-133 ' ' ­ ­ ZSF-5.7 ' ­ GB-4.5 ' ­ ' ­ ' ­ PC-1.5 WA-6 ST-18 ' ­ UM-714 ' ­ ' ­ WWR-26 UM-698 ' ­ ' RT-3 ­ OK-25.6 ́ CD-24 ' ­ ' ­ CEC-23.2 ' ­ RO-0 SR-1.2 WDM-3 CD-10 ' ­ EDM-6 ' ­ ' ' ­ ­ ' ­ BE - Blue Earth River RWR - Redwood River PC - Pipestone Creek GB - Garvin Brook TMB - Two Rivers (Middle Branch) KA - Kawishiwi River SA - Sauk River BF - Big Fork River POP - Poplar River UM - Mississippi River VR - Vermillion River KE - Kettle River BRU - Brule River SC - St. Croix River PT - Pomme De Terre River BV - Beaver River SK - Snake River KN - Knife River WA - Watonwan River RA - Rainy River LE - Lester River SL - St. Louis River CA - Cannon River WDM - Des Moines River (W Fork) RE - Red River SLB - St. Louis Bay LF - Little Fork River WR - Winter Road River CD - Cedar River RL - Red Lake River RO - Rock River SN - Snake River LPR - Long Prairie River WWR - Whitewater River CEC - Center Creek MI - Minnesota River YM - Yellow Medicine River RP - Rapid River SR - Shell Rock River CO - Cottonwood River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) RT - Root River ST - Straight River EDM - De Moines River (E Fork) SUN - Sunrise River OT - Otter Tail River RUM - Rum River

26 24 Recent 10-Year Median Pollutant Concentrations At Minnesota Milestone Sites Chloride ' ­ RA-12 TMB-19 ' ­ ' ­ RA-83 ' ­ WR-1 RP-0.1 ' ­ ' ­ ' ­ SK-1.8 ' ­ BF-0.5 LF-0.5 RE-298 ' ­ RL-0.2 ' ­ KA-10 ' ­ ' ­ ' ­ RL-23 BRU-0.4 ' ­ POP-0 ' ­ UM-1292 ' ­ ' SL-110 ­ ' ­ ' ­ UM-1186 ' ­ RE-403 UM-1172 BV-4 UM-1365 ' ­ KN-0.2 ' ­ RE-452 ' ­ SL-38 ' LE-0.2 ­ ' ­ ' ­ SLB-1 ' ­ SL-9 RE-536 OT-49 ' ­ CL mg/L LPR-3 ' ­ ' ­ ' ­ OT-1 ' 0 - 6 ­ UM-982 KE-11 ' ­ ' ' ­ ­ SC-111 ' 6 - 12 ­ ' ­ SN-10 12 - 18 ' ­ UM-930 ' 18 - 30 ­ ' ­ SA-0 RUM-34 ' ­ ' ­ ' ­ UM-914 ' ­ SUN-5 30+ ' ­ CR-0.2 ' ­ UM-895 PT-10 ' ' ­ ­ RUM-0.6 Rivers ' ­ SC-23 UM-859 ' ­ ' ­ SC-17 Basin Boundaries ' ­ UM-840 ' ­ UM-826 MI-3.5 ' ­ Milestone site designations refer ' ­ UM-815 YM-0.5 MI-212 ' ­ ' ­ to rivers' names (see table at bottom) VR-32.5 ' ­ ' ­ and approximate distances in miles MI-196 ' ­ ' ­ ' ­ from rivers' mouths MI-64 ' ­ RWR-1 CA-13 MI-88 CO-0.5 ' ­ ' ­ ' ­ UM-738 BE-0 MI-133 ' ' ­ ­ ZSF-5.7 ' ­ GB-4.5 ' ­ ' ­ ' ­ PC-1.5 WA-6 ST-18 ' ­ UM-714 ' ­ ' ­ WWR-26 UM-698 ' ­ ' RT-3 ­ OK-25.6 ́ CD-24 ' ­ ' ­ CEC-23.2 ' ­ RO-0 SR-1.2 WDM-3 CD-10 ' ­ EDM-6 ' ­ ' ' ­ ­ ' ­ BE - Blue Earth River RWR - Redwood River PC - Pipestone Creek GB - Garvin Brook TMB - Two Rivers (Middle Branch) KA - Kawishiwi River SA - Sauk River BF - Big Fork River POP - Poplar River UM - Mississippi River VR - Vermillion River KE - Kettle River BRU - Brule River SC - St. Croix River PT - Pomme De Terre River BV - Beaver River SK - Snake River KN - Knife River WA - Watonwan River RA - Rainy River LE - Lester River SL - St. Louis River CA - Cannon River WDM - Des Moines River (W Fork) RE - Red River SLB - St. Louis Bay LF - Little Fork River WR - Winter Road River CD - Cedar River RL - Red Lake River RO - Rock River SN - Snake River LPR - Long Prairie River WWR - Whitewater River CEC - Center Creek MI - Minnesota River YM - Yellow Medicine River RP - Rapid River SR - Shell Rock River CO - Cottonwood River CR - Crow River OK - Okabena Creek ZSF - Zumbro River (S Fork) RT - Root River ST - Straight River EDM - De Moines River (E Fork) SUN - Sunrise River OT - Otter Tail River RUM - Rum River

27 25 Longitudinal concentrations along mainstem s pollutant conc The graphs that follow illustrate longitudinal changes in median entrations along the Mississippi, Red, Minnesota, St. Louis, and St. Croix River mainstems, moving from upstream to downstream. Worth noting is the marked differences in pollutant concentrations among the different rivers, reflecting the different ecoregio ns in which they lie. Also w orth noting is the marked increase in for certain pollutants in the Mississippi where the river enters the Twin Cities concentrations between UM metropolitan area – -859 in Fridley – and/or where it is jo ined by -895 in Monticello and UM the Minnesota River between UM -859 in Fridley and UM -840 in St. Paul. –

28 26 Total Suspended Solids Concentrations Red at Mainstem Milestone Sites 250 (in mg/L) 200 Mississippi 100 150 4 joined by the Minnesota joined the St Croix by 3 80 60 100 40 50 20 0 0 St Louis St Croix Minnesota Rainy 100 100 100 100 80 80 80 80 60 60 60 60 40 40 40 40 20 20 20 20 0 0 0 0

29 27 Total Phosphorus Concentrations at Mainstem Milestone Sites (in mg/L) Mississippi Red 0.5 0.5 joined by the Minnesota 4 3 joined the St Croix by 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.0 0.0 St Louis Rainy Minnesota St Croix 0.5 0.5 0.5 0.5 0.4 0.4 0.4 0.4 0.3 0.3 0.3 0.3 0.2 0.2 0.2 0.2 0.1 0.1 0.1 0.1 0.0 0.0 0.0 0.0 MI-3.5 MI-64 MI-133 MI-196 MI-212 MI-88

30 28 Nitrite/Nitrate Concentrations at Mainstem Milestone Sites (in mg/L) Red Mississippi 3 3 joined by the Minnesota 4 by joined 3 the St Croix 2 2 1 1 0 0 St Louis Minnesota St Croix Rainy 3 3 7 3 6 2 2 2 5 1 1 1 4 3 0 0 0 2 1 0

31 29 Biochemical Oxygen Demand Concentrations at Mainstem Milestone Sites (in mg/L) Red Mississippi 5 5 4 joined by the Minnesota joined 3 by the St Croix 4 4 3 3 2 2 1 1 0 0 St Louis St Croix Minnesota Rainy 5 5 5 5 4 4 4 4 3 3 3 3 2 2 2 2 1 1 1 1 0 0 0 0

32 30 Chloride Concentrations at Mainstem Milestone Sites (in mg/L) Red Mississippi 60 60 joined by the Minnesota 4 3 by joined the St Croix 50 50 40 40 30 30 20 20 10 10 0 0 St Louis Minnesota Rainy St Croix 60 60 60 60 50 50 50 50 40 40 40 40 30 30 30 30 20 20 20 20 10 10 10 10 0 0 0 0 MI-3.5 MI-64 MI-133 MI-196 MI-212 MI-88

33 31 Detailed t oncentration s at individual milestone s ites rends and c estimated changes in pollutant concentrations, both over the entire period The tables that follow show over the 15 -year period from 1995 to 2010, as well as median pollutant of record for each site and concentrations for the initial and most recent 10 ye Sites are arranged by major river basins, from ars. northwest to southeast across the state, and, within the b asins, showing first the mainstem (if present) from upstream to downstream and then the tributaries to the mainstem.

34 32 Red River of the North Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at Bridge on CSAH-18, 0.5 Mi W of Brushvale (S000-012)(RE-536) (period of record 1953 - 2009) Red River no trend decrease increase no trend increase no trend overall trend 3.1% -0.7% estimated average annual change 1.4% 448% estimated total change 63% -33% no trend increase no trend increase 1995 - 2009 trend increase no trend 5.7% 4.7% estimated average annual change 1.7% estimated total change 58% 75% 23% 0.3 0.1 0.12 3 3 median concentrations first 10 years 68 0.3 median concentrations most recent 10 years <0.05 3 15 74 0.2 Red River at Bridge on Main Ave at 3rd St. in Moorhead (S000-183)(RE-452) (period of record 1971 - 2009) increase no trend decrease increase increase no trend overall trend -1.8% 2.1% 2.0% estimated average annual change 2.3% 94% -47% 118% estimated total change 135% no trend 1995 - 2009 trend no trend no trend no trend no trend no trend estimated average annual change estimated total change median concentrations first 10 years 0.2 0.1 0.10 3 10 55 120 0.3 0.3 median concentrations most recent 10 years 2 17 <0.05 Red River at Bridge on CSAH-39, 1 Mi W of Perley (S000-113)(RE-403) (period of record 1967 - 2010) increase decrease decrease decrease no trend overall trend increase -0.5% 2.3% -2.0% 1.1% estimated average annual change -5.6% -19% -84% -59% 63% estimated total change 115% no trend no trend no trend decrease no trend no trend 1995 - 2010 trend estimated average annual change -3.2% estimated total change -43% median concentrations first 10 years 0.3 0.15 4 19 0.5 170 0.5 0.4 0.05 2 18 median concentrations most recent 10 years 230 at Bridge 50' Upstream of Red Lake R Confl (S001-222)(RE-298) (period of record 1953 - 2010) Red River increase overall trend increase decrease decrease increase no trend 1.2% 3.4% -1.5% 1.0% estimated average annual change -5.2% 94% -82% -59% 75% estimated total change 212% no trend no trend no trend no trend decrease no trend 1995 - 2010 trend -3.0% estimated average annual change -40% estimated total change 118 0.3 0.3 0.09 3 10 median concentrations first 10 years 160 0.4 0.5 <0.05 1 19 median concentrations most recent 10 years

35 33 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand at CSAH-15 Clvrts, W of Fergus Falls (S000-111)(OT-49) (period of record 1967 - 2010) Otter Tail River no trend decrease increase decrease no trend no trend overall trend 1.8% -2.8% estimated average annual change -1.8% 119% estimated total change -54% -70% no trend no trend no trend little data 1995 - 2010 trend no trend no trend estimated average annual change estimated total change 33 median concentrations first 10 years 0.09 0.07 4 4 0.2 0.1 0.06 <0.05 median concentrations most recent 10 years 10 13 1 Otter Tail River at Bridge on 4Th St N at Breckenridge (S000-006)(OT-1) (period of record 1953 - 2010) decrease decrease decrease increase increase overall trend decrease -2.2% -4.9% -1.7% 2.2% -0.5% estimated average annual change 2.3% -68% 117% -80% -62% estimated total change -26% 260% no trend no trend no trend no trend no trend no trend 1995 - 2010 trend estimated average annual change estimated total change 96 0.2 0.05 0.09 3 3 median concentrations first 10 years 64 0.1 median concentrations most recent 10 years <0.05 1 10 0.06 Red Lake River at Bridge on CSAH-15 at Fisher (S000-031)(RL-23) (period of record 1955 - 2010) no trend decrease no trend decrease increase overall trend increase 1.8% 1.7% estimated average annual change -0.8% -1.7% estimated total change -36% 63% -62% 156% no trend no trend no trend no trend no trend no trend 1995 - 2010 trend estimated average annual change estimated total change 0.2 0.08 4 3 median concentrations first 10 years 0.02 94 median concentrations most recent 10 years 0.11 <0.05 2 7 79 0.2 Downstream of MN-220 Bridge in East Grand Forks (S000-013)(RL-0.2) (period of record 1953 - 2010) Red Lake River overall trend no trend increase decrease decrease increase decrease -1.4% 1.1% -1.7% 1.7% estimated average annual change -4.9% -51% -80% -62% 158% estimated total change 47% no trend no trend no trend no trend no trend 1995 - 2010 trend no trend estimated average annual change estimated total change median concentrations first 10 years 0.2 0.04 0.12 3 6 84 98 0.2 0.13 <0.05 1 7 median concentrations most recent 10 years

36 34 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Ammonia Chloride Solids Phosphorus Demand at Bridge on MN-220 N of Big Woods (S000-185)(SK-1.8) (period of record 1971 - 2010) Snake River no trend overall trend no trend decrease decrease no trend decrease -5.3% -1.7% estimated average annual change -0.7% -88% -24% estimated total change -49% decrease decrease no trend no trend no trend 1995 - 2010 trend no trend -4.8% estimated average annual change -1.3% estimated total change -22% -60% 47 0.3 <0.01 0.25 4 22 median concentrations first 10 years 70 median concentrations most recent 10 years <0.05 <0.05 2 14 0.3 Two Rivers on US-75, 1 Mi N of Hallock (S000-186)(TMB-19) (period of record 1971 - 2010) decrease no trend no trend decrease no trend no trend overall trend -3.5% -2.1% estimated average annual change estimated total change -57% -75% no trend no trend no trend no trend 1995 - 2010 trend no trend no trend estimated average annual change estimated total change median concentrations first 10 years 0.3 <0.01 0.10 3 22 24 30 0.2 0.08 <0.05 2 17 median concentrations most recent 10 years

37 35 Rainy River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at International Bridge at International Falls (S000-007)(RA-83) (period of record 1953 - 2010) Rainy River no trend decrease no trend decrease decrease increase overall trend -2.6% 1.6% -2.4% estimated average annual change -3.8% estimated total change -78% -75% -86% 71% no trend no trend no trend no trend little data no trend 1995 - 2010 trend estimated average annual change estimated total change 0.05 0.02 0.05 2 1 median concentrations first 10 years 7 0.02 median concentrations most recent 10 years <0.05 1 2 2 <0.05 Rainy River at International Bridge at Baudette (S000-063)(RA-12) (period of record 1958 - 2010) overall trend decrease increase no trend decrease increase decrease -2.3% 1.9% -2.5% 1.5% estimated average annual change -2.0% -64% -71% -73% 114% estimated total change 90% no trend no trend no trend no trend little data 1995 - 2010 trend no trend estimated average annual change estimated total change 15 0.07 0.02 0.05 3 median concentrations first 10 years 2 median concentrations most recent 10 years 0.03 <0.05 <0.05 1 3 4 at Bridge on MN-1 at Dam 8 Mi SE of Ely (S000-108)(KA-10) (period of record 1967 - 2009) Kawishiwi River decrease no trend no trend no trend no trend overall trend decrease -1.3% estimated average annual change -1.4% -46% -43% estimated total change decrease no trend no trend no trend little data no trend 1995 - 2009 trend estimated average annual change -11.3% estimated total change -62% median concentrations first 10 years 2 0.03 0.05 1 1 0.02 3 0.02 <0.05 <0.05 1 2 median concentrations most recent 10 years Little Fork River at MN-11 Bridge, 0.5 Mi W of Pelland (S000-179)(LF-0.5) (period of record 1971 - 2009) no trend decrease no trend decrease increase overall trend no trend -1.3% 2.0% estimated average annual change -1.1% estimated total change -40% -37% 123% no trend no trend no trend no trend 1995 - 2009 trend little data no trend estimated average annual change estimated total change median concentrations first 10 years 0.1 0.03 0.07 2 3 12 12 0.1 0.06 <0.05 1 4 median concentrations most recent 10 years

38 36 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand Big Fork River at Bridge On Mn-11, 4 Mi E Of Loman (S000-173)(BF-0.5) (period of record 1971 - 2010) decrease no trend decrease decrease no trend overall trend decrease estimated average annual change -0.7% -1.5% -1.6% -1.5% -47% -36% -26% -46% estimated total change no trend no trend no trend increase 1995 - 2010 trend no trend little data 11.8% estimated average annual change estimated total change 144% median concentrations first 10 years 0.07 0.01 0.08 2 3 13 0.05 <0.05 <0.05 median concentrations most recent 10 years 2 12 1 Rapid River at Bridge on MN-11 at Clementson (S000-184)(RP-0.1) (period of record 1971 - 2010) overall trend decrease decrease no trend no trend no trend decrease -1.7% -1.5% estimated average annual change -2.9% estimated total change -44% -69% -48% no trend no trend no trend no trend little data no trend 1995 - 2010 trend estimated average annual change estimated total change 0.07 0.03 0.09 2 2 10 median concentrations first 10 years 0.05 <0.05 <0.05 1 1 median concentrations most recent 10 years 9 Winter Road River at MN-11 Bridge 4 Mi W of Baudette (S000-069)(WR-1) (period of record 1958 - 2010) no trend no trend no trend no trend overall trend little data decrease estimated average annual change -2.2% -69% estimated total change no trend no trend no trend no trend little data no trend 1995 - 2010 trend estimated average annual change estimated total change 4 median concentrations first 10 years 0.01 0.11 3 -- 0.04 median concentrations most recent 10 years 4 0.03 <0.05 <0.05 1 2

39 37 Lake Superior Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Ammonia Chloride Solids Phosphorus Demand Upstream of US-61 at Judge C R Magney Park (S000-251)(BRU-0.4) (period of record 1973 - 2010) Brule River no trend no trend no trend decrease no trend overall trend no trend -2.6% estimated average annual change -63% estimated total change no trend no trend no trend little data 1995 - 2010 trend no trend decrease estimated average annual change -5.0% -60% estimated total change 0.02 0.03 0.04 1.1 2 median concentrations first 10 years 1 0.01 2 <0.05 <0.5 1 median concentrations most recent 10 years <0.05 Poplar River between Foot Bridges at Lutsen Lodge (S000-261)(POP-0) (period of record 1973 - 2010) no trend no trend no trend no trend decrease no trend overall trend -1.7% estimated average annual change -48% estimated total change no trend no trend no trend no trend little data no trend 1995 - 2010 trend estimated average annual change estimated total change median concentrations first 10 years 2 0.04 0.04 0.03 0.9 3 3 0.02 0.05 <0.05 0.7 2 median concentrations most recent 10 years South of CSAH-3 1.5 Mi NW of Beaver Bay (S000-252)(BV-4) (period of record 1973 - 2010) Beaver River decrease decrease no trend decrease increase overall trend increase -3.4% 3.7% 2.6% -2.8% estimated average annual change -1.0% -72% -30% 155% -65% estimated total change 248% no trend increase no trend no trend little data no trend 1995 - 2010 trend estimated average annual change 11.6% 528% estimated total change median concentrations first 10 years 4 0.01 0.06 1.0 3 0.03 2 0.01 0.39 <0.05 0.6 median concentrations most recent 10 years 7 Knife River Upstream of Old US-61 at Knife River (S000-257)(KN-0.2) (period of record 1973 - 2010) decrease decrease no trend decrease no trend overall trend no trend -1.3% -2.0% estimated average annual change -1.5% estimated total change -40% -44% -52% no trend no trend no trend no trend 1995 - 2010 trend little data no trend estimated average annual change estimated total change median concentrations first 10 years 0.03 <0.01 0.04 0.9 6 5 2 0.01 <0.05 <0.05 0.5 5 median concentrations most recent 10 years

40 38 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand above Superior St, Lester Pk at Duluth (S000-258)(LE-0.2) (period of record 1973 - 2010) Lester River decrease no trend increase decrease no trend no trend overall trend 2.0% -1.7% estimated average annual change -1.6% 112% estimated total change -45% -48% no trend no trend no trend little data 1995 - 2010 trend no trend no trend estimated average annual change estimated total change 5 median concentrations first 10 years 0.03 0.07 1.0 5 0.04 0.02 <0.05 <0.05 median concentrations most recent 10 years 11 2 0.8 at Bridge at CSAH-7, 0.5 Mi S of Forbes (S000-119)(SL-110) (period of record 1967 - 2010) St. Louis River decrease no trend decrease little data overall trend decrease decrease -4.4% -1.9% -1.7% estimated average annual change -1.6% estimated total change -52% -58% -77% -50% decrease no trend no trend no trend little data decrease 1995 - 2010 trend -0.9% estimated average annual change -3.2% -15% -42% estimated total change median concentrations first 10 years 0.04 0.04 0.08 1.2 6 6 4 0.03 <0.05 <0.05 median concentrations most recent 10 years 6 0.8 St. Louis River at Bridge on US-2, 2 Mi SE of Brookston (S000-023)(SL-38) (period of record 1953 - 2010) decrease decrease decrease decrease increase overall trend no trend -2.3% -4.8% 1.5% -1.1% estimated average annual change -1.6% -67% -61% 101% -49% estimated total change -79% no trend no trend no trend no trend little data no trend 1995 - 2010 trend estimated average annual change estimated total change 0.11 0.08 3 2 median concentrations first 10 years 0.08 13 median concentrations most recent 10 years 0.06 <0.05 1 5 4 0.04 at Bridge on MN-23 at Fond Du Lac (S000-021)(SL-9) (period of record 1953 - 2010) St. Louis River overall trend decrease no trend decrease decrease decrease decrease -2.5% -3.4% -4.9% -1.5% estimated average annual change -3.1% -77% -69% -95% -58% estimated total change -83% decrease no trend no trend no trend no trend little data 1995 - 2010 trend -2.3% estimated average annual change -32% estimated total change 13 0.12 0.06 0.10 5 7 median concentrations first 10 years 5 0.04 0.09 <0.05 1 7 median concentrations most recent 10 years

41 39 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Demand Chloride Phosphorus Ammonia Solids St. Louis River below I-535 Bridge at Superior, WI (S000-277) and Duluth, MN (S003-975)(SLB-1) (period of record 1974 - 2010) decrease increase decrease overall trend decrease decrease decrease -4.3% -3.2% 0.7% -3.8% -2.5% -1.4% estimated average annual change -80% -70% 27% -71% -61% estimated total change -40% 1995 - 2010 trend no trend increase increase no trend increase no trend 5.0% 2.8% estimated average annual change 8.5% estimated total change 117% 270% 54% 11 0.10 0.1 median concentrations first 10 years 2 14 0.11 median concentrations most recent 10 years 5 0.05 0.2 0.07 1 11

42 40 Upper Mississippi River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at MN-200 Bridge 0.5 Mi W of Lake Itasca (S000-105)(UM-1365) (period of record 1965 - 2010) Mississippi River no trend decrease no trend decrease decrease overall trend no trend -1.4% -1.9% estimated average annual change -2.2% estimated total change -59% -47% -64% 1995 - 2010 trend no trend no trend little data no trend increase no trend estimated average annual change 2.0% estimated total change 40% <0.01 0.06 2 3 4 median concentrations first 10 years 0.06 0.05 median concentrations most recent 10 years <0.05 1 2 2 <0.05 Mississippi River at Bridge on CSAH-8 7 Mi E of Bemidji (S000-155)(UM-1292) (period of record 1967 - 2010) decrease decrease decrease increase no trend overall trend decrease -2.6% -2.2% 0.5% -2.7% estimated average annual change -4.8% -88% -56% -62% 24% estimated total change -70% no trend 1995 - 2010 trend no trend no trend little data no trend no trend estimated average annual change estimated total change median concentrations first 10 years 0.09 0.01 0.07 3 4 5 1 0.03 <0.05 median concentrations most recent 10 years 1 7 <0.05 Mississippi River at MN-6 Bridge 8 Mi SW of Cohasset (S000-154)(UM-1186) (period of record 1967 - 2010) decrease decrease decrease decrease increase overall trend no trend -1.6% -4.1% 0.2% -2.1% estimated average annual change -2.7% -51% -69% 9% -59% estimated total change -74% no trend no trend no trend no trend little data no trend 1995 - 2010 trend estimated average annual change estimated total change 0.05 0.10 2 3 median concentrations first 10 years <0.01 7 median concentrations most recent 10 years <0.05 <0.05 1 3 2 0.03 at Bridge on CR-441 1 Mi SW of Blackberry (S000-220)(UM-1172) (period of record 1974 - 2010) Mississippi River overall trend decrease no trend decrease decrease no trend decrease -2.2% -4.2% -2.7% estimated average annual change -2.0% estimated total change -56% -52% -70% -63% decrease decrease no trend no trend no trend little data 1995 - 2010 trend -2.7% -2.0% estimated average annual change -37% estimated total change -29% 8 0.09 0.02 0.10 2 median concentrations first 10 years 4 median concentrations most recent 10 years 3 0.04 <0.05 <0.05 1 5

43 41 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand at Bridge on MN-115 at Camp Ripley (S000-151)(UM-982) (period of record 1967 - 2010) Mississippi River decrease decrease increase decrease decrease overall trend increase -3.3% -2.3% 2.7% -2.0% -1.0% estimated average annual change 4.8% 399% -66% -63% estimated total change -35% -59% 216% no trend no trend no trend little data 1995 - 2010 trend no trend no trend estimated average annual change estimated total change median concentrations first 10 years 0.07 0.07 0.08 2 4 8 0.05 median concentrations most recent 10 years <0.05 1 9 5 0.19 Mississippi River at 9th Ave Bridge (Old MN-15) at Sauk Rapids (S000-026)(UM-930) (period of record 1953 - 2010) decrease decrease decrease increase increase overall trend decrease -1.4% -4.3% -1.8% 3.8% -2.0% estimated average annual change 2.3% -53% 116% -75% -65% 762% estimated total change -68% no trend no trend no trend little data no trend increase 1995 - 2010 trend 3.3% estimated average annual change estimated total change 73% 0.14 median concentrations first 10 years 0.09 3 2 22 0.07 7 0.08 median concentrations most recent 10 years <0.05 1 9 0.16 Mississippi River at Bridge on MN-24 at Clearwater (S000-148)(UM-914) (period of record 1967 - 2010) no trend decrease decrease decrease increase overall trend increase 2.8% -4.1% 3.7% -1.6% estimated average annual change -2.0% 161% -58% 387% -51% estimated total change -74% no trend increase no trend no trend little data no trend 1995 - 2010 trend estimated average annual change 4.6% estimated total change 96% median concentrations first 10 years 0.1 0.10 3 5 0.11 11 0.07 0.2 <0.05 2 11 median concentrations most recent 10 years 8 at Bridge on MN-25 at Monticello (S000-221)(UM-895) (period of record 1976 - 2010) Mississippi River overall trend decrease increase decrease decrease no trend decrease -1.3% -2.1% -5.2% -1.1% estimated average annual change 4.7% -37% 372% -82% -32% estimated total change -51% decrease no trend increase no trend no trend little data 1995 - 2010 trend estimated average annual change -3.0% 4.1% -40% estimated total change 97% 15 0.12 0.2 0.10 2 median concentrations first 10 years 8 median concentrations most recent 10 years 8 0.09 0.4 <0.05 2 12

44 42 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand at Mpls City Building at Fridley (S000-024)(UM-859) (period of record 1953 - 2010) Mississippi River decrease decrease increase decrease decrease overall trend increase -3.8% -1.1% 4.1% -1.4% -0.9% estimated average annual change 2.0% 95% -73% -46% 931% estimated total change -40% -45% no trend 1995 - 2010 trend no trend little data decrease no trend no trend -4.2% estimated average annual change -52% estimated total change 0.2 median concentrations first 10 years 3 1 33 0.2 0.10 median concentrations most recent 10 years 0.3 <0.05 2 25 19 0.1 Mississippi River at Dock Upstream of Wabasha St Bridge, St Paul (S000-266)(UM-840) (period of record 1973 - 2010) decrease no trend decrease increase increase overall trend decrease -6.7% 2.4% 3.0% estimated average annual change -1.0% -1.4% 186% -41% 137% -30% estimated total change -89% 1995 - 2010 trend no trend no trend no trend little data decrease decrease -3.3% estimated average annual change -2.2% -32% -43% estimated total change median concentrations first 10 years 34 2 0.18 3 16 0.2 68 0.2 3 <0.05 2 median concentrations most recent 10 years 25 Mississippi River at Pier at Gravel Quarry, Grey Cloud Island (S000-339)(UM-826) (period of record 1975 - 2010) no trend decrease decrease decrease increase overall trend increase 3.7% -8.5% 1.0% -1.7% estimated average annual change -2.4% 270% -59% 44% -46% estimated total change -96% decrease increase no trend decrease little data decrease 1995 - 2010 trend estimated average annual change 1.8% -1.7% -2.2% -3.5% -46% -26% -32% 36% estimated total change 0.3 median concentrations first 10 years 0.48 4 25 37 2 48 0.2 3 0.08 2 31 median concentrations most recent 10 years Mississippi River at Lock & Dam #2 at Hastings (S000-068)(UM-815) (period of record 1958 - 2010) decrease decrease decrease decrease increase overall trend increase -1.6% -2.2% -6.2% -0.4% 2.9% estimated average annual change 2.2% -20% 109% -96% -68% 321% estimated total change -58% decrease decrease no trend 1995 - 2010 trend no trend little data no trend estimated average annual change -3.2% -3.4% -44% estimated total change -43% 44 0.3 1 0.27 6 median concentrations first 10 years 13 median concentrations most recent 10 years 42 0.2 2 0.05 3 28

45 43 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand at Bridge on US-10, South of Motley (S000-282)(LPR-3) (period of record 1974 -- 2010) Long Prairie River decrease decrease increase decrease no trend increase overall trend -0.7% 2.9% -3.6% -1.4% estimated average annual change 0.8% -69% estimated total change 178% -40% 29% -23% no trend no trend decrease little data 1995 - 2010 trend no trend no trend estimated average annual change -2.0% -28% estimated total change 0.08 0.05 0.09 median concentrations first 10 years 8 5 1 3 0.10 <0.05 1 25 median concentrations most recent 10 years 0.09 Sauk River Downstream of Bridge on CSAH-1 at Sauk Rapids (S000-017)(SA-0) (period of record 1953 - 2011) overall trend decrease increase decrease no trend increase no trend 2.1% -4.5% 3.8% estimated average annual change -1.5% 131% -85% 796% estimated total change -44% no trend no trend no trend no trend little data increase 1995 - 2010 trend 3.4% estimated average annual change estimated total change 80% 23 0.3 0.4 0.14 4 3 median concentrations first 10 years median concentrations most recent 10 years 9 0.4 <0.05 2 32 0.2 at Bridge on CSAH-36 at Dayton (S000-004)(CR-0.2) (period of record 1953 - 2009) Crow River no trend increase no trend no trend increase overall trend no trend 1.4% estimated average annual change 3.0% estimated total change 125% 371% no trend no trend no trend no trend decrease no trend 1995 - 2009 trend estimated average annual change -2.9% -35% estimated total change 0.3 0.1 0.13 7 8 median concentrations first 10 years 80 0.3 0.7 <0.05 6 33 median concentrations most recent 10 years 51 at Bridge on CSAH-5, 0.5 Mi W of Isanti (S000-043)(RUM-34) (period of record 1955 - 2010) Rum River decrease decrease increase decrease decrease increase overall trend -1.6% -0.9% -4.4% -2.4% 2.6% estimated average annual change 1.1% -58% 44% -77% -75% 303% estimated total change -37% no trend no trend no trend no trend 1995 - 2010 trend little data no trend estimated average annual change estimated total change median concentrations first 10 years 0.2 0.1 0.10 6 4 23 14 0.1 0.2 <0.05 2 12 median concentrations most recent 10 years

46 44 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Demand Chloride Phosphorus Ammonia Solids Rum River at Bridge on Pleasant St in Anoka (S000-016)(RUM-0.6) (period of record 1953 - 2010) decrease increase overall trend decrease increase decrease no trend -2.2% -1.5% 0.6% -1.8% 3.5% estimated average annual change -72% -51% 22% estimated total change 606% -65% 1995 - 2010 trend no trend no trend no trend decrease little data no trend -3.3% estimated average annual change -43% estimated total change 24 0.2 0.1 <0.02 4 median concentrations first 10 years 5 median concentrations most recent 10 years 8 0.1 0.1 <0.05 2 18

47 45 Minnesota River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at Bridge on CSAH-21, 3 Mi NE of Delhi (S000-055)(MI-212) (period of record 1981 - 2009) Minnesota River decrease no trend little data decrease decrease overall trend no trend -0.8% -1.4% estimated average annual change -5.2% estimated total change -32% -20% -77% 1995 - 2009 trend no trend increase little data decrease decrease decrease -3.4% 4.3% estimated average annual change -4.2% -6.6% -67% 97% -49% estimated total change -43% 0.2 1.0 0.08 5 -- median concentrations first 10 years 84 0.2 median concentrations most recent 10 years <0.05 4 22 54 0.2 Minnesota River at Bridge on US-71 and MN-19 at Morton (S000-145)(MI-196) (period of record 1967 - 2009) overall trend decrease decrease increase no trend decrease no trend -1.2% 2.5% -6.5% estimated average annual change -0.5% -88% -40% 182% estimated total change -20% no trend no trend no trend increase little data 1995 - 2009 trend no trend 4.8% estimated average annual change estimated total change 110% 0.3 median concentrations first 10 years 0.11 5 18 86 1.4 68 0.2 0.7 <0.05 median concentrations most recent 10 years 26 4 Minnesota River at CSAH-24 Bridge, 1 Mi S of Courtland (S000-054)(MI-133) (period of record 1957 - 2009) decrease decrease decrease decrease increase overall trend no trend -1.0% -5.0% 3.2% -0.7% estimated average annual change -1.6% -42% -57% 380% -30% estimated total change -80% decrease no trend no trend increase little data decrease 1995 - 2009 trend -5.1% 4.8% estimated average annual change -2.2% -30% -56% 110% estimated total change 0.3 median concentrations first 10 years 0.10 7 14 125 2 79 0.2 1 <0.05 4 29 median concentrations most recent 10 years Minnesota River at Bridge on MN-22 at St. Peter (S000-041)(MI-88) (period of record 1955 - 2009) no trend decrease decrease decrease increase overall trend no trend -5.3% -1.5% 5.0% estimated average annual change -1.8% estimated total change -55% -82% -63% 1011% decrease decrease no trend no trend increase little data 1995 - 2009 trend -5.8% estimated average annual change 6.6% -3.9% -61% 177% estimated total change -47% 110 0.4 4 0.10 6 median concentrations first 10 years 16 median concentrations most recent 10 years 87 0.2 4 <0.05 4 29

48 46 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand at MN-19 Bridge at Henderson (S000-040)(MI-64) (period of record 1955 - 2009) Minnesota River decrease decrease increase decrease decrease no trend overall trend -2.1% 3.2% -5.6% -0.7% estimated average annual change -1.3% -83% -68% 362% estimated total change -30% -48% no trend 1995 - 2009 trend increase little data decrease decrease no trend -2.6% -4.3% estimated average annual change 4.7% estimated total change -51% -34% 108% 0.4 4 0.10 median concentrations first 10 years 17 140 6 81 3 <0.05 4 32 median concentrations most recent 10 years 0.2 Minnesota River at MCES Site off SE End of Runway 12L/30R (S000-310)(MI-3.5) (period of record 1980 - 2009) no trend decrease no trend little data no trend decrease overall trend -7.7% estimated average annual change -1.8% estimated total change -41% -90% decrease no trend 1995 - 2009 trend no trend little data decrease no trend -4.8% estimated average annual change -3.0% -38% -54% estimated total change median concentrations first 10 years 77 3 0.28 4 -- 0.4 71 0.2 7 <0.05 3 median concentrations most recent 10 years 55 Pomme de Terre River above Dam E of MN-7 at Appleton (S000-195)(PT-10) (period of record 1971 - 2009) no trend decrease decrease decrease increase overall trend increase 3.9% -6.3% 1.6% -1.4% estimated average annual change -2.1% 280% -56% 89% -42% estimated total change -87% no trend no trend no trend no trend no trend decrease 1995 - 2009 trend -3.1% estimated average annual change estimated total change -38% 0.3 0.15 4 9 77 0.1 median concentrations first 10 years 0.2 median concentrations most recent 10 years <0.05 2 13 73 0.3 at MN-67 Bridge 7 Mi SE of Granite Falls (S000-159)(YM-0.5) (period of record 1967 - 2009) Yellow Medicine River decrease decrease overall trend decrease decrease increase increase estimated average annual change -2.4% 0.8% -2.6% -1.9% 2.2% -1.8% -52% -63% -53% -56% 148% estimated total change 29% decrease no trend no trend decrease little data 1995 - 2009 trend decrease -10.6% -5.1% -4.7% estimated average annual change estimated total change -83% -53% -57% 65 13 0.3 0.13 5 median concentrations first 10 years 0.2 median concentrations most recent 10 years 0.1 0.3 <0.05 2 18 26

49 47 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand at Bridge on CSAH-101 at North Redwood (S000-299)(RWR-1) (period of record 1974 - 2009) Redwood River decrease decrease no trend decrease no trend overall trend no trend -7.7% 1.6% estimated average annual change -1.7% estimated total change 74% -90% -45% 1995 - 2009 trend no trend no trend little data no trend increase no trend estimated average annual change 3.6% estimated total change 76% 4 0.3 4 105 42 median concentrations first 10 years 0.14 0.3 2 <0.05 median concentrations most recent 10 years 71 51 4 Cottonwood River at MN-15, 0.5 Mi SE of New Ulm (S000-139)(CO-0.5) (period of record 1967 - 2009) decrease no trend decrease increase no trend overall trend decrease -2.4% -3.4% -1.6% estimated average annual change 0.9% estimated total change -50% -64% -64% 47% decrease no trend 1995 - 2009 trend increase little data decrease no trend -4.9% 2.8% estimated average annual change -3.9% -47% -55% 54% estimated total change 0.2 median concentrations first 10 years 0.08 6 22 49 5 65 0.1 median concentrations most recent 10 years <0.05 5 29 3 Center Creek between S34/35, 1 Mi NE of Fairmont (S000-291)(CEC-23.2) (period of record 1974 - 2009) no trend decrease decrease decrease no trend overall trend increase 3.5% -3.4% estimated average annual change -5.2% -9.5% estimated total change -85% 215% -96% -70% no trend increase no trend no trend little data decrease 1995 - 2009 trend -4.4% estimated average annual change 3.9% 83% -51% estimated total change median concentrations first 10 years 49 2 2.10 8 110 1.9 38 0.3 6 0.08 4 79 median concentrations most recent 10 years Watonwan River at Bridge on CSAH-13, 1 Mi W of Garden City (S000-163)(WA-6) (period of record 1968 - 2009) no trend decrease decrease decrease increase overall trend no trend -1.8% -0.5% 1.8% estimated average annual change -2.3% estimated total change -20% -41% -62% 105% decrease no trend no trend no trend 1995 - 2009 trend little data no trend estimated average annual change -5.4% -59% estimated total change 70 0.3 2 0.07 5 28 median concentrations first 10 years 52 0.2 6 <0.05 2 42 median concentrations most recent 10 years

50 48 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Demand Chloride Phosphorus Ammonia Solids Blue Earth River in Sibley Park at Mankato (S000-134)(BE-0) (period of record 1967 - 2009) decrease no trend overall trend decrease increase no trend decrease -1.8% -4.6% -2.3% 1.5% estimated average annual change -54% -77% -63% 85% estimated total change 1995 - 2009 trend decrease no trend no trend increase little data decrease -7.1% 4.7% estimated average annual change -6.1% estimated total change -69% -63% 107% 115 0.3 9 median concentrations first 10 years 5 25 0.08 median concentrations most recent 10 years 62 0.2 7 <0.05 5 31

51 49 St. Croix River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Ammonia Chloride Solids Phosphorus Demand at MN-48 Br, 3.5 Mi W of Danbury, WI (S000-056)(SC-111) (period of record 1957 - 2009) St. Croix River no trend decrease increase decrease decrease no trend overall trend 2.0% -2.7% -2.3% estimated average annual change -2.6% -76% estimated total change -70% -74% 163% decrease no trend no trend little data 1995 - 2009 trend no trend no trend estimated average annual change 1.9% 35% estimated total change 0.07 0.03 0.05 3 2 median concentrations first 10 years 11 4 0.03 <0.05 1 5 median concentrations most recent 10 years <0.05 St. Croix River downstream of MN-212 Bridge in Stillwater (S000-019)(SC-23) (period of record 1953 - 2009) increase no trend decrease increase decrease decrease overall trend 1.9% -1.0% 1.3% -1.6% estimated average annual change -1.5% -57% 74% -44% estimated total change -59% 87% no trend no trend no trend no trend little data 1995 - 2009 trend no trend estimated average annual change estimated total change 18 0.2 0.1 0.06 4 4 median concentrations first 10 years 10 0.1 0.1 median concentrations most recent 10 years 2 7 <0.05 St. Croix River from RR Bridge at Hudson (S000-126)(SC-17) (period of record 1967 - 2009) decrease decrease decrease decrease increase overall trend increase -2.5% 2.3% -2.2% 2.0% -2.2% estimated average annual change -5.1% -65% -80% -60% 131% -61% estimated total change 112% no trend no trend no trend no trend no trend no trend 1995 - 2009 trend estimated average annual change estimated total change 9 0.1 0.16 3 4 0.1 median concentrations first 10 years 0.1 0.2 <0.05 1 7 median concentrations most recent 10 years 5 at Bridge on MN-48, 4.5 Mi E of Hinckley (S000-121)(KE-11) (period of record 1967 - 2009) Kettle River decrease overall trend no trend decrease decrease increase decrease -2.0% -1.4% -2.3% 2.3% estimated average annual change -5.3% -58% -83% -63% 159% estimated total change -45% no trend no trend increase no trend no trend little data 1995 - 2009 trend 2.4% estimated average annual change 46% estimated total change 7 0.07 0.06 0.11 2 6 median concentrations first 10 years 3 0.05 0.10 <0.05 1 8 median concentrations most recent 10 years

52 50 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand Snake River below Cross Lake Dam, 2 Mi NE of Pine City (S000-198)(SN-10) (period of record 1971 - 2009) no trend overall trend no trend increase no trend decrease no trend 1.7% -2.0% estimated average annual change estimated total change -32% 92% no trend no trend no trend no trend little data 1995 - 2009 trend no trend estimated average annual change estimated total change 10 0.19 0.06 0.04 5 5 median concentrations first 10 years 7 0.09 0.06 0.06 2 median concentrations most recent 10 years 8 North Branch Sunrise River at MN-95, 4 Mi E of North Branch (S000-301)(SUN-5) (period of record 1974 - 2009) overall trend increase no trend increase no trend decrease no trend -1.8% 2.2% estimated average annual change 2.8% estimated total change -48% 70% 114% decrease no trend increase no trend no trend 1995 - 2009 trend little data estimated average annual change 3.0% -3.7% -45% estimated total change 61% 26 0.1 2 0.03 2 median concentrations first 10 years 8 median concentrations most recent 10 years 8 0.1 2 <0.05 1 31

53 51 Lower Mississippi River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at Lock & Dam #5 3 Mi SE of Minneiska (S000-287)(UM-738) (period of record 1974 - 2008) Mississippi River decrease decrease increase decrease decrease overall trend increase -5.8% -1.5% 2.8% -1.3% -1.2% estimated average annual change 3.1% 164% -84% -40% estimated total change -33% -36% 152% no trend no trend decrease little data 1995 - 2008 trend decrease increase 2.2% -3.0% estimated average annual change -2.1% estimated total change -37% 39% -27% 0.2 1 median concentrations first 10 years 4 14 22 0.12 17 1 <0.05 2 23 median concentrations most recent 10 years 0.1 Mississippi River at Lock & Dam #6 at Trempealeau, WI (S000-095)(UM-714) (period of record 1962 - 2009) overall trend decrease increase decrease decrease increase decrease -1.0% 1.6% -5.3% -1.7% 2.5% estimated average annual change -1.4% -38% 54% -77% -55% 214% estimated total change -48% no trend no trend no trend no trend little data increase 1995 - 2009 trend 3.2% estimated average annual change estimated total change 60% 34 0.2 1 0.09 median concentrations first 10 years 9 5 median concentrations most recent 10 years 0.2 2 <0.05 2 18 21 under US-14 Bridge at La Crosse (S000-067)(UM-698) (period of record 1958 - 2008) Mississippi River decrease increase decrease decrease no trend overall trend no trend 2.6% -1.9% estimated average annual change -0.9% -4.9% estimated total change -31% 78% -64% -53% no trend increase no trend no trend no trend little data 1995 - 2008 trend estimated average annual change 4.0% 21% estimated total change median concentrations first 10 years 28 0.9 0.10 4 12 0.2 20 0.2 0.9 <0.05 2 18 median concentrations most recent 10 years at Bridge on Blaine Ave, 4 Mi NE of Farmington (S000-896)(VR-32.5) (period of record 1982 - 2008) Vermillion River decrease decrease no trend decrease increase little data overall trend -1.7% -3.0% 1.6% estimated average annual change -1.9% estimated total change -37% -40% -56% 54% decrease decrease decrease no trend no trend little data 1995 - 2008 trend -4.0% -4.3% estimated average annual change -9.6% -41% -43% estimated total change -73% 19 0.8 4 0.08 1 median concentrations first 10 years -- median concentrations most recent 10 years 12 0.5 5 <0.05 1 52

54 52 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand near CSAH-1, 1 Mi SE of Clinton Falls (S000-047)(ST-18) (period of record 1955 - 2009) Straight River decrease decrease increase decrease decrease no trend overall trend -3.5% 1.4% -7.4% -1.9% average annual change -1.0% -98% -85% 114% total change -64% -43% no trend 1995 - 2009 trend no trend little data no trend no trend no trend average annual change total change 38 median concentrations first 10 years 1 0.44 7 17 0.7 0.3 4 median concentrations most recent 10 years 1 30 23 <0.05 Cannon River at Bridge on CSAH-7 at Welch (S000-003)(CA-13) (period of record 1953 - 2008) decrease decrease decrease increase increase overall trend decrease -2.3% -7.0% -0.8% 1.8% -2.6% average annual change 1.4% -69% 105% -97% -37% 178% total change -77% no trend no trend no trend little data no trend increase 1995 - 2008 trend 1.9% average annual change total change 31% 0.3 median concentrations first 10 years 0.20 4 11 26 1 14 0.2 4 median concentrations most recent 10 years 2 28 <0.05 Zumbro River at CSAH-14, 3 Mi N of Rochester (S000-268)(ZSF-5.7) (period of record 1973 - 2008) decrease decrease decrease decrease increase overall trend increase -7.1% average annual change -4.6% 3.0% 2.3% -2.9% -10.0% -92% -97% -81% 186% -64% total change 120% no trend no trend no trend no trend little data decrease 1995 - 2008 trend -6.7% average annual change total change -42% median concentrations first 10 years 45 0.9 0.50 5 36 3 16 0.2 7 <0.05 2 54 median concentrations most recent 10 years Whitewater River S Fork N of CR-115 3.5 Mi NW of Utica (S000-288)(WWR-26) (period of record 1974 - 2008) decrease no trend decrease decrease increase overall trend increase 1.8% -2.8% -2.4% 1.9% estimated average annual change -2.0% -57% -46% -64% 94% estimated total change 79% no trend no trend increase 1995 - 2008 trend no trend little data no trend estimated average annual change 2.5% 46% estimated total change 32 0.5 7 0.08 3 27 median concentrations first 10 years 16 0.4 11 <0.05 1 43 median concentrations most recent 10 years

55 53 Total Biochemical Total Nitrite/ Suspended Oxygen Nitrate Solids Chloride Ammonia Phosphorus Demand Garvin Brook at CSAH-23, SW of Minnesota City (S000-828)(GB-4.5) (period of record 1981 - 2008) decrease decrease decrease overall trend increase increase decrease 3.1% -2.0% -1.8% 3.6% -4.0% estimated average annual change -1.7% -38% 130% estimated total change -38% 159% -67% -42% decrease increase no trend no trend little data 1995 - 2008 trend no trend 2.6% -8.5% estimated average annual change 46% -74% estimated total change 62 1 0.09 2 6 median concentrations first 10 years 0.1 23 0.1 median concentrations most recent 10 years <0.05 1 13 2 Root River at Bridge on MN-26, 3 Mi E of Hokah (S000-065)(RT-3) (period of record 1958 - 2008) overall trend increase decrease decrease increase decrease decrease -2.4% -4.1% -1.0% -1.3% 1.4% estimated average annual change 3.7% -41% 355% -34% -88% 76% estimated total change -70% decrease no trend little data no trend no trend increase 1995 - 2008 trend -8.2% estimated average annual change 2.2% estimated total change -61% 39% 120 0.3 1 0.15 median concentrations first 10 years 7 4 median concentrations most recent 10 years 58 0.1 4 <0.05 1 13

56 54 Missouri River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at Bridge on Stateline Rd 10 Mi S of Luverne (S000-097)(RO-0) (period of record 1962 - 2011) Rock River decrease overall trend increase decrease decrease increase decrease -2.4% 4.3% -4.6% -2.7% 2.1% estimated average annual change -1.6% -70% estimated total change -74% -73% 175% -55% 334% no trend no trend no trend no trend little data increase 1995 - 2011 trend 1.5% estimated average annual change estimated total change 29% 110 0.4 0.8 0.09 9 23 median concentrations first 10 years 30 median concentrations most recent 10 years 5.4 <0.05 2 26 0.1 Pipestone Creek at Bridge on N Line of S24 (T106N/R47W) (S000-099)(PC-1.5) (period of record 1963 - 2009) decrease increase decrease decrease no trend overall trend no trend -6.3% -7.8% -2.8% estimated average annual change 2.0% estimated total change -95% 91% -91% -73% decrease no trend no trend 1995 - 2009 trend no trend little data no trend estimated average annual change -5.4% -58% estimated total change 57 1.9 2 0.24 9 87 median concentrations first 10 years 39 0.2 4 0.07 5 26 median concentrations most recent 10 years

57 55 Des Moines River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand at Petersburg Rd, S of Petersburg (S000-156)(WDM-3) (period of record 1967 - 2009) West Fork Des Moines River decrease no trend no trend no trend increase no trend overall trend -5.3% estimated average annual change 1.9% estimated total change 89% -78% no trend no trend no trend little data no trend no trend 1995 - 2009 trend estimated average annual change estimated total change 0.3 median concentrations first 10 years 0.11 9 37 67 0.4 71 3.0 <0.05 8 38 median concentrations most recent 10 years 0.2 East Fork Des Moines River at MN-263, 2 Mi NE Ceylon (S000-141)(EDM-6) (period of record 1967 - 2009) overall trend no trend decrease decrease no trend decrease decrease -1.2% -6.2% -3.0% estimated average annual change -2.0% estimated total change -41% -57% -88% -72% 1995 - 2009 trend no trend no trend no trend no trend little data no trend estimated average annual change estimated total change median concentrations first 10 years 7 0.18 5 36 85 0.4 0.2 <0.05 5 36 20 median concentrations most recent 10 years 11 Okabena Creek at CSAH-14, 2 Mi SE of Brewster (S000-240)(OK-25.6) (period of record 1973 - 2009) no trend increase decrease decrease little data overall trend decrease 6.0% -8.6% -4.2% estimated average annual change -4.9% -84% estimated total change -92% -79% 422% decrease no trend no trend no trend little data decrease 1995 - 2009 trend -8.5% estimated average annual change -20.1% estimated total change -76% -97% 86 2 8 0.19 median concentrations first 10 years --- 4 median concentrations most recent 10 years 32 5 42 <0.05 2 175

58 56 Cedar River Basin Biochemical Total Nitrite/ Oxygen Suspended Total Nitrate Solids Chloride Ammonia Phosphorus Demand Cedar River at CSAH-2, 0.5 Mi E of Lansing (S000-137)(CD-24) (period of record 1967 - 2009) overall trend decrease increase decrease decrease no trend decrease 3.2% estimated average annual change -4.1% -2.8% -2.0% -1.6% -58% 294% -50% -83% -71% estimated total change no trend no trend no trend no trend little data 1995 - 2009 trend no trend estimated average annual change estimated total change 0.3 2 0.10 4 20 median concentrations first 10 years 38 0.2 <0.05 1 20 11 median concentrations most recent 10 years 8 Cedar River at CSAH-4, 3 Mi S of Austin (S000-136)(CD-10) (period of record 1967 - 2009) decrease decrease decrease decrease no trend increase overall trend estimated average annual change -2.9% 2.5% -5.2% -3.9% -2.9% -71% -72% 193% estimated total change -82% -90% 1995 - 2009 trend no trend increase no trend no trend little data no trend 3.1% estimated average annual change estimated total change 53% 0.7 0.29 6 41 42 3 median concentrations first 10 years 0.2 9 <0.05 2 median concentrations most recent 10 years 34 28 at Bridge on CSAH-1, 1 Mi W of Gordonsville (S000-084)(SR-1.2) (period of record 1961 - 2009) Shell Rock River overall trend decrease decrease increase decrease decrease increase -1.9% -1.0% 4.6% -0.9% -2.9% estimated average annual change 1.0% estimated total change -38% 563% -37% -77% 59% -60% no trend no trend no trend no trend little data 1995 - 2009 trend no trend estimated average annual change estimated total change 99 1 median concentrations first 10 years 0.10 14 35 0.5 median concentrations most recent 10 years 0.4 2 <0.05 7 43 54

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