Badger Lake IA 04-UDM-1291
Webster County S19T90NR28W 4.5 mi N of Fort Dodge.
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 10/27/2025 3:10:06 PM
- Updated
- 11/20/2025 10:44:24 AM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2020 | Class A1 | Turbidity: Secchi Disk Transparency | Ambient monitoring: Iowa DNR-lakes | New data: WQ improvement (chemical / physical / bacterial) |
The Class A1 use remains assessed (monitored) as "fully supported." The Class BLW use was assessed (evaluated) as “WINOFI” due to water quality impacts of common carp. 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 2020-2024 22940001 Badger
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 22940001 6 14 / 5 7.55 9.06 8.3 1 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 22940001 6 Chlorophyll a TSI 14 / 5 35 83 64 NO MONITORED FULL 22940001 6 Secchi TSI 14 / 5 45 70 61 NO MONITORED FULL 22940001 6 Total Phosphorus TSI 14 / 5 35 83 65 NA NA NA 22940001 6 Fixed suspended solids 14 / 5 1.6 16 3 NA NA NA DNR's assessment methodology indicates that a TSI value less
than or equal to 63 are necessary to suggest de-listing of an
impairment. The Secchi depth TSI value for the 2020 assessment
listing cycle was 65, which based on DNR's assessment/listing methodology
indicated an impairment based on the narrative criteria protecting against
aesthetically objectionable conditions. Because the TSI value for the 2026
assessment/listing cycle is less than or equal to the delisting trigger of 63
(median TSI value for Secchi depth was 61), based on DNR's methodology, these
values suggest "full support" of the Class A1 uses protecting against
aesthetically objectionable conditions and the impairment (5a) for Secchi depth
is suggested for delisting for the 2026 assessment/listing cycle. 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 22940001 6 Dissolved Oxygen 13 / 5 7.4 16.4 11.4 0 NA / NA 4 NO MONITORED FULL 22940001 6 pH 14 / 5 7.55 9.06 8.3 1 NA / NA 4 NO MONITORED FULL 22940001 6 Temperature 14 / 5 15.5 28.7 23 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 22940001 6 5 1.464794449 19.25% 0.00727672 0.04% 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 22940001 6 Ammonia 14 / 5 0.222 0.06 0.03 0 / 0 NO MONITORED FULL Class HH - No Data
Additional information: The Class BLW use was assessed
(evaluated) as “WINOFI” based on information from the DNR Fisheries Bureau.
Information from the DNR Fisheries Bureau suggests that siltation and the
impacts of common carp on turbidity at this lake impair the aquatic life use.