Unnamed Lake
Douglas County, MinnesotaLimited DataEutrophic
On the LakeGrade rubric Unnamed Lake fails the cutoffs — a TSI of 60 and persistent algal pressure put it in the bottom tier.
A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake is compact at 23 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within the 51 graded lakes of Douglas County, Unnamed Lake sits at rank 48, near the bottom of the county list.
No invasive species are currently listed at Unnamed Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Unnamed Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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 2022-07-21. 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 3.3 ft of visibility. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 23 acres |
Location
County Ranking
Ranked #48 of 51 lakes in Douglas County
Cleaner Lakes Within 30 Miles
Unnamed Lake holds Grade F. 4 nearby lakes hold higher grades.
Nearby Lakes in Douglas County
More Minnesota Lake Rankings
State Parks Near Unnamed Lake
Other Grade F Lakes in Minnesota
Eutrophic Lakes in Minnesota
Reservoir Info (USACE NID)
Unnamed Lake is a man-made reservoir impounded by the Urness 10, built primarily for fish and wildlife pond on the Chippewa River-TR; earth-type dam, 10 ft tall.
- Surface area
- 23 ac
- Normal storage
- 69 ac-ft
- Max storage
- 69 ac-ft
- Drainage area
- 1.1 sq mi
- Hazard class
- Low
- Owner
- MNDNR-Wildlife
Source: USACE National Inventory of Dams, NID ID MN01563 · Operator website · Matched by proximity (0.36 km)
EPA Impairment Status
Unnamed Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MN21-0305-00 · Official waterbody report · Matched by proximity (2.5 km)
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
Lake details from Minnesota DNR LakeFinder
Most recent sample: 2022-07-21
Monitoring stations: 1