Viking Lake IA 05-NOD-1407
Montgomery County S6T71NR36W 4 mi. E of Stanton.
The Class A1 use was assessed as "not supported" due to aesthetically objectionable conditions caused by algae blooms. 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 2022-2024 21690001 Viking
Lake Beach
Iowa DNR 6 WQ CY 2021-2024 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 (2022/ 2023/2024) 2022 Geometric Mean 2023 Geometric Mean 2024 Geometric Mean Violates Annual Geometric Mean? # 2022 SSM violations / SSM Violations needed for impairment # 2023 SSM violations / SSM Violations needed for impairment # 2024 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 21690001 6 15/13/14 21 28 22 NO 2 / 4 2 / 4 2 / 4 NO MONITORED 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 21690001 6 43 / 3 7.6 9.2 8.4 1 8 NO MONITORED FULL 22690001 6 12 / 4 7.53 9 8.17 0 4 NO MONITORED 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 12 / 4 37 72 65 YES MONITORED NOT 22690001 6 Secchi TSI 12 / 4 52 66 60 NO MONITORED FULL 22690001 6 Total Phosphorus TSI 12 / 4 37 61 57 NA NA NA 22690001 6 Fixed suspended solids 12 / 4 1.7 7 2.4 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 21690001 6 Dissolved Oxygen 43 / 3 4.37 13.11 8.43 2 NA / NA 8 NO MONITORED FULL 22690001 6 Dissolved Oxygen 12 / 4 3.4 10.9 7.1 2 NA / NA 4 NO MONITORED FULL 21690001 6 pH 43 / 3 7.6 9.2 8.4 1 NA / NA 8 NO MONITORED FULL 22690001 6 pH 12 / 4 7.53 9 8.17 0 NA / NA 4 NO MONITORED FULL 21690001 6 Temperature 43 / 3 18.3 29.5 26 0 NA / NA 8 NO MONITORED FULL 22690001 6 Temperature 12 / 4 18.5 29.2 24.3 0 NA / NA 4 NO MONITORED 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 24.11310366 90.00% 5.865437478 59.95% NO EVALUATED NA 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 12 / 4 0.073 0.03 0.02 0 / 0 NO MONITORED 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) 11 / 4 0.05 0.3 0.13 0.11 0 NO MONITORED FULL 21690001 6 pH 43 / 3 7.6 9.2 8.4 8.4 1 NO MONITORED FULL 22690001 6 pH 12 / 4 7.53 9 8.17 8.23 0 NO MONITORED 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