Cedar Lake
Linn County, WisconsinHypereutrophic
Cedar Lake is a 115-acre highly nutrient-loaded hypereutrophic lake in Linn County, IA. Water quality is graded F based on 2 sampling years through 2024. Compared to the 1 other monitored lakes in Linn County, Cedar Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-26. 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: 129 µg/L. Trophic State Index: 79.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.9 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 129 µg/L | F |
| Trophic State Index (TSI) | 79 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 115 acres |
Location
County Ranking
Ranked #2 of 2 lakes in Linn County
Cleaner Lakes Within 30 Miles
Cedar Lake holds Grade F. 4 nearby lakes hold higher grades.
- CKent Park LakeJohnson County · 18.8 mi · Two grade letters higher (F → C)
- DPleasant Creek LakeLinn County · 11.9 mi · Higher grade (F → D)
- DLake MacbrideJohnson County · 14.4 mi · Higher grade (F → D)
- DCentral Park LakeJones County · 28.4 mi · Higher grade (F → D)
Nearby Lakes in Linn County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Cedar Lake is a man-made reservoir impounded by the Cedar Lake Dam, built primarily for flood risk reduction on the Tr to Cedar River; earth-type dam, 15 ft tall and 2,000 ft long.
- Surface area
- 115 ac
- Normal storage
- 200 ac-ft
- Max storage
- 1,350 ac-ft
- Drainage area
- 4.7 sq mi
- Hazard class
- Low
- Owner
- City of Cedar Rapids
Source: USACE National Inventory of Dams, NID ID IA04469 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-26
Monitoring stations: 1