Viking Lake IA 05-NOD-1407
Montgomery County S6T71NR36W 4 mi. E of Stanton.
The Class A1 use was assessed (monitored) as “fully supported.” The Class BLW use was assessed (monitored) as “fully supported.” The Class C (drinking water) use was assessed (monitored) as “fully supported.” The Class HH (fish consumption) use was assessed (monitored) as “fully supported” based on fish tissue sampling data.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2022 21690001 Viking
Lake Beach
Iowa DNR 6 WQ CY 2018-2022 22690001 Viking
Lake
Iowa DNR 6 FT See Below 1337 Viking
Lake Viking
Lake State Park Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 21690001 6 15/14/15 36 37 21 NO 2 / 4 2 / 4 2 / 4 NO Mon Full Class A1 - pH: Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 22690001 6 11 / 4 7.53 9 8.4 0 3 NO Mon Full Class A1 - Lake TSI's: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Median Value Median TSI Violation? Assessment Type Support Level 22690001 6 Chlorophyll a TSI 11 / 4 46 68 61 NO Mon Full 22690001 6 Secchi TSI 11 / 4 50 70 62 NO Mon Full 22690001 6 Total Phosphorus TSI 11 / 4 37 67 60 NA NA NA 22690001 6 Inorganic suspended solids 11 / 4 0.6 7 1.7 NA NA NA Class BLW - Binomial Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 22690001 6 Dissolved Oxygen 11 / 4 5.9 10.9 8.2 0 NA / NA 3 NO Mon Full 22690001 6 pH 11 / 4 7.53 9 8.4 0 NA / NA 3 NO Mon Full 22690001 6 Temperature 11 / 4 18.5 29.2 25 0 NA / NA 3 NO Mon Full Class BLW - Lake Planktonic Cyanobacteria: Site ID Data Source ID # Samples Maximum Cyanobacteria Wet Mass Maximum Cyanobacteria % Composition Median Cyanobacteria Wet Mass Median Cyanobacteria % Composition Median Cyanobacteria Concentration = 75th Percentile Assessment Type Support Level 22690001 6 4 35.55048534 97% 15.06706212 67% YES Evaluated 3b Class BLW - Toxic Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 22690001 6 Ammonia 11 / 4 0.114 0.03 0.02 0 / 0 NO Mon Full Class C - Binomial Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value Median Value # Violations Violates Significantly >10% Rule? Assessment Type Support Level 22690001 6 Inorganic nitrogen (nitrate and nitrite) 10 / 4 0.02 0.3 0.09 0.04 0 NO Mon Full 22690001 6 pH 11 / 4 7.53 9 8.4 8.26 0 NO Mon Full Class HH - Fish
Tissue Sampling: Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 1337 fillet 2015 channel catfish 5 46.6 0.03 0.02 0.06 1337 tissue plug 2020 crappie spp. 10 27.5 0.21
1337 tissue plug 2019 largemouth bass 10 32.5 0.269
Support Level Full