Lake Ahquabi IA 04-LDM-1080
Warren County S14T75NR24W 4 mi SSW of Indianola.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 11/1/2023 8:13:06 AM
- Updated
- 2/5/2024 8:21:54 AM
The Class A1 use was assessed (monitored) as “not supported” due to aesthetically objectionable conditions caused by non-algal turbidity. 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 "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 2020-2021 21910001 Lake
Ahquabi Beach
Iowa DNR 6 WQ CY 2018-2021 22910002 Lake
Ahquabi
Iowa
DNR 6 FT See
Below 1071 Lake Ahquabi S of Indianola 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 21910001 6 8/7/0 31 59 NA NO 2 / 3 1 / 3 NA 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 22910002 6 11 / 4 7 8.73 8.18 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 22910002 6 Chlorophyll a TSI 11 / 4 15 71 61 NO Mon Full 22910002 6 Secchi TSI 11 / 4 41 73 68 YES Mon Not 22910002 6 Total Phosphorus TSI 11 / 4 57 70 64 NA NA NA 22910002 6 Inorganic suspended solids 11 / 4 0.6 7.5 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 22910002 6 Dissolved Oxygen 10 / 4 4.1 11.3 7.6 1 NA / NA 3 NO Mon Full 22910002 6 pH 11 / 4 7 8.73 8.18 0 NA / NA 3 NO Mon Full 22910002 6 Temperature 11 / 4 22.1 29.3 25.2 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 22910002 6 4 8.450481068 95% 4.796588552 41% 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 22910002 6 Ammonia 11 / 4 0.142 0.06 0.04 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 22910002 6 Inorganic nitrogen (nitrate and nitrite) 11 / 4 0.02 0.63 0.14 0.03 0 NO Mon Full 22910002 6 pH 11 / 4 7 8.73 8.18 8.2 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) 1071 tissue plug 2019 largemouth bass 10 34 0.218
Support Level Full