Lacey Keosauqua Lake IA 04-LDM-1008
Van Buren County S2T68NR10W 1 mi S of Keosauqua
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trophic
- Mesotrophic
- Trend
- Stable
- Created
- 11/1/2023 8:13:01 AM
- Updated
- 2/5/2024 7:58:07 AM
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.” All other designated uses were “not assessed.”
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2022 21890001 Lacey-Keosauqua
Beach
Iowa DNR 6 WQ CY 2018-2022 22890004 Lacey
Keosauqua Lake
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 21890001 6 16/15/15 20 18 11 NO 0 / 4 1 / 4 0 / 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 22890004 6 12 / 4 7.7 8.3 8 0 4 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 22890004 6 Chlorophyll a TSI 12 / 4 26 54 40 NO Mon Full 22890004 6 Secchi TSI 12 / 4 38 92 52 NO Mon Full 22890004 6 Total Phosphorus TSI 12 / 4 37 81 50 NA NA NA 22890004 6 Inorganic suspended solids 12 / 4 0.6 46 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 22890004 6 Dissolved Oxygen 12 / 4 5.6 14.8 8.5 0 NA / NA 4 NO Mon Full 22890004 6 pH 12 / 4 7.7 8.3 8 0 NA / NA 4 NO Mon Full 22890004 6 Temperature 12 / 4 18.8 30.4 25.5 0 NA / NA 4 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 22890004 6 3 4.640980463 39% 0.296135441 12% 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 22890004 6 Ammonia 12 / 4 0.092 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 22890004 6 Inorganic nitrogen (nitrate and nitrite) 11 / 4 0.02 0.78 0.15 0.06 0 NO Mon Full 22890004 6 pH 12 / 4 7.7 8.3 8 8.1 0 NO Mon Full
Class HH - No Data