2020 Ave. Nitrate Concentrations-Raccoon River Tributaries April - August Clay Palo Alto 02 01 Buena Vista Pocahontas 03 04 05 06 08 12 10 Webster Sac Calhoun 17 09 11 16 19 20 14 22 23 44 Carroll Greene Boone 43 26 25 24 30 28 28A 33 mg/L NitrateAu-dNubon Guthrie Dallas Polk 70 Incomplete Data 27 40 0-5 29 39 5-10 34 10-15 15-20 Miles Over 20 mg/L Adair Madison Warren 0 2.5 5 10 15 20 Mainstem Not Monitored www.acwa-rrws.org 2020 Ave. Nitrate Concentrations-Raccoon River April - August !( Site 02 - 7.7 mg/L !( Site 02A - 7.5 mg/L !( Site 07 - 7.9 mg/L ¤£20 !( Site 13 - 7 mg/L !( Site 14A - 7.3 mg/L ¤£169 ¤£30 !( Site 21 - 6.9 mg/L Site 26A - 9.3 mg/L !( Site 45 - 8.1 mg/L !( ¤£71 Site C - 5.2 mg/L !( Site B - 4.1 mg/L Site 31 - Incomplete Data !( !( Site A - 6.3 mg/L Site 32 - Incomplete Data !( !( !(!( Site 38 - 5.4 mg/L Site 37 - 3.7 mg/L Sample Sites !( Mainstem Miles 0 2 4 8 12 16 US Hwy www.acwa-rrws.org 2020 Average Nitrate-N Concentrations Site_Id Stream_Name April May June July August Annual 01 Lateral 2 10.2 9.9 12.5 7.1 1.0 8.1 02 North Raccoon River 9.6 9.8 12.4 6.0 0.6 7.7 02A North Raccoon River 9.4 9.2 12.0 6.1 0.7 7.5 03 Poor Farm Creek 8.8 8.8 11.7 6.3 0.5 7.2 04 Little Cedar Creek 8.3 8.5 11.6 7.1 0.2 7.1 04A Cedar Creek 8.7 9.2 11.9 7.6 0.7 7.6 05 Outlet Creek 8.2 14.8 7.8 18.4 28.2 15.5 06 Prairie Creek 8.8 9.6 12.2 5.9 1.7 7.6 07 North Raccoon River 8.7 9.1 11.1 7.4 3.0 7.9 08 Cedar Creek 8.7 9.0 11.3 6.3 0.7 7.2 09 Indian Creek 6.6 7.0 8.2 3.5 1.1 5.3 10 Camp Creek 9.3 9.5 11.7 3.8 0.4 6.9 11 Prairie Creek 9.5 9.7 12.1 6.6 3.2 8.2 12 Lake Creek 7.3 8.2 10.5 3.2 4.6 6.8 13 North Raccoon River 8.2 8.8 11.1 5.8 1.3 7.0 14 Elk Run 12.6 12.7 15.7 4.8 0.4 9.2 14A North Raccoon River 8.8 9.6 11.2 5.8 1.0 7.3 16 West Buttrick Creek 10.0 10.6 12.6 3.9 0.8 7.6 17 Cedar Creek 8.1 8.1 11.1 2.9 0.3 6.1 19 Purgatory Creek 7.6 7.9 10.4 3.2 0.3 5.9 20 East Buttrick Creek 7.1 8.0 10.8 3.3 0.2 5.9 21 + North Raccoon River 8.3 8.3 11.2 6.5 0.4 6.9 22 Hardin Creek 7.5 8.6 11.8 2.9 0.2 6.2 23 Buttrick Creek 7.6 8.8 11.3 2.8 0.2 6.1 24 Greenbrier Creek 5.9 6.2 7.3 1.4 0.2 4.2 25 Willow Creek 6.3 7.1 8.3 3.1 0.7 5.1 26 Middle Raccoon River 8.7 9.1 11.0 6.9 2.0 7.5 26A Middle Raccoon River 8.0 7.9 9.8 4.3 1.4 6.3 28 Brushy Creek 7.7 7.1 8.3 5.9 3.0 6.4 28A South Raccoon River 3.6 3.8 4.4 3.5 3.0 3.7 30 Mosquito Creek 5.6 5.8 6.7 1.5 31 Middle Raccoon River 5.8 5.0 5.5 2.4 32 South Raccoon River 4.4 4.0 5.3 3.6 33 Panther Creek 7.7 8.6 11.8 3.1 Mainstem All concentrations in mg/L, which is the same as ppm + Site data provided by Iowa Water Quality Information System (https://iwqis.iowawis.org/) www.acwa-rrws.org 2020 Average Nitrate-N Concentrations Site_Id Stream_Name April May June July August Annual 37 South Raccoon River 5.4 4.7 5.7 2.4 0.2 3.7 38 + Raccoon River 7.4 6.1 9.7 3.7 0.2 5.4 40 $ Walnut Creek 42A Brushy Creek 11.7 11.2 13.0 10.0 5.6 10.3 42B Brushy Creek 13.8 12.9 14.8 11.8 7.9 12.2 43 Brushy Creek 11.4 10.2 11.3 8.6 3.9 9.0 44 Middle Raccoon River 10.1 10.5 11.9 7.3 4.6 8.9 45 North Raccoon River 8.0 8.6 10.9 4.9 8.1 60 Swan Lake Branch 10.4 10.3 13.1 3.3 61 Elm Branch 10.2 8.3 12.5 4.5 70 $ Walnut Creek A North Raccoon River 7.3 7.7 11.0 4.3 1.1 6.3 B + South Raccoon River 5.5 4.8 5.6 3.2 1.3 4.1 C + Middle Raccoon River 7.5 5.9 6.1 4.3 2.0 5.2 WRR7 Middle Raccoon River 8.9 9.1 11.3 7.6 2.1 7.8 Mainstem All concentrations in mg/L, which is the same as ppm No Data + Site data provided by Iowa Water Quality Information System (https://iwqis.iowawis.org/) $ Site data provided by Drake University Dept. of Environmental Science and Sustainability www.acwa-rrws.org.