Lacey Keosauqua Lake IA 04-LDM-1008
Van Buren County S2T68NR10W 1 mi S of Keosauqua
- Cycle
- 2022
- 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
- 12/27/2021 2:31:50 PM
- Updated
- 2/9/2022 2:12:17 PM
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 2018-2020 21890001 Lacey-Keosauqua
Beach (Lacey - Keosauqua State Park)
Iowa DNR 6 WQ CY 2016-2019 22890004 Lacey
Keosauqua Lake
Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations needed for impairment # 2019 SSM violations / SSM Violations needed for impairment # 2020 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 21890001 6 9/9/16 27 14 20 NO 1 / 3 0 / 3 0 / 4 NO Monitored Full 22890004 6 3/3/0 1 9 NA NO 0 / NA 0 / NA NA NO Evaluated 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 8.5 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 22890004 6 Chlorophyll a TSI 12 / 4 26 56 40 NO Monitored Full 22890004 6 Secchi TSI 12 / 4 38 92 47 NO Monitored Full 22890004 6 Total Phosphorus TSI 12 / 4 33 77 49 NA NA NA 22890004 6 Inorganic suspended solids 12 / 4 0.3 46 1 NA NA NA Class BLW - Conventional 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 Ammonia 12 / 4 0.0003 0.047 0.01 NA 0 / 0 4 NO Monitored Full 22890004 6 Dissolved Oxygen 12 / 4 6.5 14.8 9.5 0 NA / NA 4 NO Monitored Full 22890004 6 pH 12 / 4 7.7 8.5 8.2 0 NA / NA 4 NO Monitored Full 22890004 6 Temperature 12 / 4 17.9 30.4 25.1 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 22890004 6 5 5.07 92.4% 0.82 53.3% NO Evaluated NA Class BLW - Protection of Submerged Aquatic Vegetation: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Median Value Median Value = SAV Assessment Type Support Level 22890004 6 Total suspended solids 12 / 4 2 50 5 NO Monitored Full Class C - Conventional 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) 12 / 4 0 0.1191 0.0358 0.02 0 NO Monitored Full 22890004 6 pH 12 / 4 7.7 8.5 8.2 8.2 0 NO Monitored Full
Class HH: No Data