Badger Lake IA 04-UDM-1291
Webster County S19T90NR28W 4.5 mi N of Fort Dodge.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trophic
- Eutrophic
- Trend
- Stable
- Created
- 12/30/2021 10:28:17 AM
- Updated
- 1/28/2022 7:26:01 AM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2018 | Class A1 | Algal Growth: Chlorophyll a | Ambient monitoring: Iowa DNR-lakes | New data: WQ improvement (chemical / physical / bacterial) |
The Class A1 use was assessed (monitored) as "not supported" due to aesthetically objectionable conditions caused by non-algal turbidity. The Class BLW use was assessed (evaluated) as “WINOFI” due to siltation and 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 2016-2020 22940001 Badger
Lake 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 15 / 5 7.3 8.6 8.1 0 4 NO Monitored Full 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 15 / 5 26 84 56 NO Monitored Full 22940001 6 Secchi TSI 15 / 5 53 77 65 YES Monitored Not 22940001 6 Total Phosphorus TSI 15 / 5 35 88 71 NA NA NA 22940001 6 Inorganic suspended solids 15 / 5 0.6 16 4 NA NA NA DNR's
assessment methodology indicates that at least two assessment/listing cycles
with a TSI value less than or equal to 63 are necessary to suggest de-listing
of an impairment. The chlorophyll a TSI value for the 2018 assessment listing
cycle was 64, 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 2020 assessment/listing
cycle was less than the trigger of 65 (2020 listing for chlorophyll a was 56),
and because the TSI value for the current listing cycle is 56, based on DNR's
methodology, these values suggest "full support" of the Class A1 use
protecting against aesthetically objectionable conditions and the impairment
(5a) for chlorophyll a is suggested for delisting for the 2022
assessment/listing cycle. 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 Ammonia 15 / 5 0.0003 0.209 0.06 NA 0 / 0 4 NO Monitored Full 22940001 6 Dissolved Oxygen 14 / 5 5.4 26.1 11.6 0 NA / NA 4 NO Monitored Full 22940001 6 pH 15 / 5 7.3 8.6 8.1 0 NA / NA 4 NO Monitored Full 22940001 6 Temperature 15 / 5 10.8 28.7 20.9 0 NA / NA 4 NO Monitored Full 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 4 0.00 0.0% 0.00 0.0% NO Evaluated NA 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.
Class A1 - Indicator Bacteria: No Data
Class A1 - pH:
Class A1 - Lake TSI's:
Class BLW - Conventional Parameters:
Class BLW - Lake Planktonic Cyanobacteria:
Class
HH -No Data
Additional information: