Littlefield Lake
Audubon County, WisconsinHypereutrophic
Littlefield Lake is a 69-acre highly nutrient-loaded hypereutrophic lake in Audubon County, IA. Water quality is graded F based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-29. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 0.9 ft of visibility. Chlorophyll-a: 103.1 µg/L. Trophic State Index: 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.9 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 103.1 µg/L | F |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 69 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Audubon County
Cleaner Lakes Within 30 Miles
Littlefield Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Audubon County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Littlefield Lake is a man-made reservoir impounded by the Littlefield Lake Dam (completed 1977), built primarily for flood risk reduction on the TR-TROUBLESOME CREEK; earth-type dam, 45 ft tall and 1,205 ft long.
- Surface area
- 69 ac
- Normal storage
- 561 ac-ft
- Max storage
- 2,278 ac-ft
- Drainage area
- 3.95 sq mi
- Hazard class
- High
- Owner
- Audubon County Conservation Board
All listed purposes: Flood Risk Reduction;Recreation.
Source: USACE National Inventory of Dams, NID ID IA01691 · Operator website
EPA Impairment Status
Littlefield Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 05-NSH-1439 · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-29
Monitoring stations: 1