Lake Icaria IA 05-NOD-1398
Adams County S10T72NR34W 4 mi N of Corning.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 12/30/2021 3:12:05 PM
- Updated
- 1/26/2022 7:29:54 AM
The Class A1 use was assessed (monitored) as “not supported” due to aesthetically objectionable conditions caused by poor water clarity. The Class BLW use was assessed (evaluated) as “WINOFI” due to poor water clarity and frequent cyanobacteria blooms. The Class C 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. Note: A TMDL for siltation at Lake Icaria was prepared by DNR and approved by EPA in 2003. Since all impairments for Lake Icaria were addressed in the TMDL, it will be listed as Category 4a for the current assessment/listing cycle.
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2016-2020 22020001 Lake
Icaria Iowa DNR 6 FT See Below 59 Lake
Icaria Lake
Icaria County Recreation Area
Class A1 - Indicator Bacteria: No Data 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 22020001 6 14 / 5 7.3 8.6 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 22020001 6 Chlorophyll a TSI 15 / 5 31 73 49 NO Monitored Full 22020001 6 Secchi TSI 15 / 5 51 77 67 YES Monitored Not 22020001 6 Total Phosphorus TSI 15 / 5 49 76 64 NA NA NA 22020001 6 Inorganic suspended solids 15 / 5 0.6 16 3 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 22020001 6 Ammonia 14 / 5 0.0003 0.328 0.08 NA 0 / 0 4 NO Monitored Full 22020001 6 Dissolved Oxygen 15 / 5 2.5 8.9 6.9 2 NA / NA 4 NO Monitored Full 22020001 6 pH 14 / 5 7.3 8.6 8.2 0 NA / NA 4 NO Monitored Full 22020001 6 Temperature 15 / 5 18.2 28.6 24.2 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 22020001 6 6 48.55 98.9% 18.57 57.9% YES Evaluated 3b 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 22020001 6 Inorganic nitrogen (nitrate and nitrite) 15 / 5 0.02 1.6 0.4 0.035 0 NO Monitored Full 22020001 6 pH 14 / 5 7.3 8.6 8.2 8.2 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) 59 tissue plug 2020 channel catfish 20 53.1 0.123
59 tissue plug 2020 common carp 20 54.8 0.099
59 tissue plug 2019 largemouth bass 10 32.1 0.083
59 tissue plug 2020 walleye 5 49.2 0.153
59 tissue plug 2019 walleye 5 50.5 0.136
Support Level Full