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D

Unnamed Lake

Otter Tail County, MinnesotaLimited DataEutrophic

Unnamed Lake earns a D — measurements through 2022 show persistent nutrient pressure that limits clarity through the summer.

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's surface area is not consistently recorded across state datasets — physical context remains partial. Within the 97 graded lakes of Otter Tail County, Unnamed Lake sits at rank 89, 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. No formal public access is documented at Unnamed Lake — most use is by shoreline residents and their guests. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2022-08-09. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 4.9 ft. Trophic State Index: 54.

MetricValueGrade
Water Clarity (Secchi Depth)4.9 ftD
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)54Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #89 of 97 lakes in Otter Tail County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade D. 5 nearby lakes hold higher grades.

Nearby Lakes in Otter Tail County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2022-08-09

Monitoring stations: 2