McKinley Lake IA 05-PLA-1470
Union County S11T72NR31W at W edge of Creston.
The Class A1 use was assessed (monitored) as “not supported” due to aesthetically objectionable conditions caused by poor water transparency, nuisance blooms of algae and violations of the pH Criteria. The Class BLW use was assessed (monitored) as “not supported” due to violations of the pH Criteria. The Class HH (fish consumption) use remains assessed (evaluated) as "not supported" (IR 5a) based on fish tissue sampling data and due to the existence of a one meal/week PCBs consumption advisory for channel catfish on this segment.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2024 14000244 McKinley
Lake
Class A - 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 14000244 6 11 / 4 8.1 9.4 8.7 4 3 YES MONITORED NOT 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 14000244 6 Chlorophyll a TSI 14 / 5 40 90 72 YES MONITORED NOT 14000244 6 Secchi TSI 14 / 5 71 93 77 YES MONITORED NOT 14000244 6 Total Phosphorus TSI 14 / 5 71 90 76 NA NA NA 14000244 6 Fixed suspended solids 14 / 5 2.7 28 17.4 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 14000244 6 Dissolved Oxygen 14 / 5 4.9 12.3 8.2 1 NA / NA 4 NO MONITORED FULL 14000244 6 pH 11 / 4 8.1 9.4 8.7 4 NA / NA 3 YES MONITORED NOT 14000244 6 Temperature 14 / 5 21.7 27 24.9 0 NA / NA 4 NO MONITORED FULL 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 14000244 6 Ammonia 11 / 4 0.316 0.11 0.1 0 / 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) 1260 fillet 2023 common carp 3 36.32 0.033 <0.05 0.0891 Support Level NOT According to DNR's methodology, a two consecutive fish tissue samples below the criteria that are collected during the monitoring window are required to suggest de-listing. Therefore, McKinley Lake will remain listed for the current assessment cycle as "not supported" for its Class HH uses due to PCBs.