Doughnut Lake
Cook County, WisconsinLimited DataEutrophic
Doughnut Lake is a productive, nutrient-rich eutrophic lake in Cook County, IL. Water quality is graded D based on 1 sampling years through 2022. Compared to the 67 other monitored lakes in Cook County, Doughnut Lake ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-09-27. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #24 of 68 lakes in Cook County
Cleaner Lakes Within 30 Miles
Doughnut Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Cook County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Doughnut Lake is a man-made reservoir impounded by the Upper Salt Creek Structure 4 Dam (completed 1987), built primarily for flood risk reduction on the SALT CREEK; earth-type dam, 14 ft tall and 3,000 ft long.
- Normal storage
- 200 ac-ft
- Max storage
- 775 ac-ft
- Hazard class
- High
- Owner
- METROPOLITAN WATER RECLAMATION DISTRICT
All listed purposes: Flood Risk Reduction;Recreation.
Source: USACE National Inventory of Dams, NID ID IL50054 · Operator website · Matched by proximity (0.27 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-27
Monitoring stations: 1