Clear Lake
Stevens County, MinnesotaHypereutrophic
Clear Lake grades an F: every scored parameter (clarity and phosphorus) rates poorly, placing it among the most stressed lakes monitored in Minnesota. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.
The hypereutrophic status — TSI 85 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Among the 6 graded lakes in Stevens County, Clear Lake sits at rank 3, above the county median.
No invasive species are currently listed at Clear Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Clear Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Clear Lake — most use is by shoreline residents and their guests. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2022-06-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 0.7 ft of visibility. Phosphorus level: 288 µg/L. Trophic State Index: 85.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.7 ft | F |
| Phosphorus | 288 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 85 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #3 of 6 lakes in Stevens County
Cleaner Lakes Within 30 Miles
Clear Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Stevens County
More Minnesota Lake Rankings
State Parks Near Clear Lake
Other Grade F Lakes in Minnesota
Reservoir Info (USACE NID)
Clear Lake is a man-made reservoir impounded by the County Ditch 18, built primarily for flood risk reduction; earth-type dam, 8 ft tall.
- Max storage
- 305 ac-ft
- Drainage area
- 9.9 sq mi
- Hazard class
- Low
- Owner
- County of Stevens Drainage Ditch Authority
Source: USACE National Inventory of Dams, NID ID MN01851 · Operator website · Matched by proximity (0.85 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-06-28
Monitoring stations: 1