Lake Wapello IA 04-LDM-1035
Davis County S34T70NR15 7 mi. W of Drakesville.
The Class A1 use was assessed (monitored) as “fully supported.” The Class BLW use was assessed (monitored) as “fully supported.” The Class C use was assessed (monitored) as “fully supported.” The Class HH (fish consumption) use was assessed as “not supported" based on fish tissue sampling data and due to the existence of a one meal per week consumption advisory for mercury for this lake.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2022-2024 21260001 Lake
Wapello Beach
Iowa DNR 6 WQ CY 2021-2024 22260001 Lake
Wapello
Iowa DNR 6 FT See Below 1310 Lake
Wapello
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 21260001 6 10/14/14 14 13 22 NO 1 / 3 1 / 4 3 / 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 22260001 6 12 / 4 7.54 8.72 8.2 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 22260001 6 Chlorophyll a TSI 12 / 4 41 67 56 NO MONITORED FULL 22260001 6 Secchi TSI 12 / 4 42 64 50 NO MONITORED FULL 22260001 6 Total Phosphorus TSI 12 / 4 37 58 49 NA NA NA 22260001 6 Fixed suspended solids 12 / 4 1.7 3 1.9 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 22260001 6 Dissolved Oxygen 12 / 4 4.8 9.9 7.9 1 NA / NA 4 NO MONITORED FULL 22260001 6 pH 12 / 4 7.54 8.72 8.2 0 NA / NA 4 NO MONITORED FULL 22260001 6 Temperature 12 / 4 22.6 29.7 25.5 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 22260001 6 5 6.4324 92.04% 3.3082 28.35% 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 22260001 6 Ammonia 12 / 4 0.027 0.02 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 22260001 6 Inorganic nitrogen (nitrate and nitrite) 11 / 4 0.05 0.52 0.18 0.15 0 NO MONITORED FULL 22260001 6 pH 12 / 4 7.54 8.72 8.2 8.22 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) 1310 fillet 2013 channel catfish 5 40.8 0.13 <0.2 <0.6 1310 tissue plug 2013 largemouth bass 5 40.9 1.212
Support Level Not A one meal/week mercury consumption advisory for
largemouth bass exists on this segment. Based on IR Methodology, the Class HH
(fish consumption) use was assessed as “not supported.”