Lost Island Lake IA 06-LSR-1632
Palo Alto County S31T97NR34W 3 mi N of Ruthven.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 1 - All designated uses are met.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 11/1/2023 8:13:32 AM
- Updated
- 2/5/2024 11:43:16 AM
The Class A1 use was assessed (monitored) as "fully supported." The Class BLW use was assessed (evaluated)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 turbidity at Lost Island Lake was prepared by DNR and approved by EPA in 2009.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2018-2022 22740002 Lost
Island Lake
Iowa DNR 6 FT See Below 1072 Lost
Island Lake N
of Ruthven 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 22740002 6 12 / 4 8.2 8.8 8.4 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 22740002 6 Chlorophyll a TSI 15 / 5 35 69 55 NO Mon Full 22740002 6 Secchi TSI 15 / 5 35 72 59 NO Mon Full 22740002 6 Total Phosphorus TSI 15 / 5 37 71 62 NA NA NA 22740002 6 Inorganic suspended solids 15 / 5 0.6 18 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 22740002 6 Dissolved Oxygen 13 / 5 7.4 10.6 8.7 0 NA / NA 4 NO Mon Full 22740002 6 pH 12 / 4 8.2 8.8 8.4 0 NA / NA 4 NO Mon Full 22740002 6 Temperature 13 / 5 16.6 27.4 23.1 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 22740002 6 5 85.94183166 95% 10.88225929 77% 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 22740002 6 Ammonia 12 / 4 0.067 0.02 0.01 0 / 0 NO Mon Full Class BLW - Fish Kill Assessment: The Class BLW aquatic life use assessment based on the 2013 fish kill for this segment has been changed from 3b to 3a (not assessed) based on the age of the data. 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) 1072 tissue plug 2020 northern pike 10 67.6 0.065
Support Level Full