Skip to main content
LakeQuality
F

Unnamed Lake

Otter Tail County, MinnesotaLimited DataHypereutrophic

Unnamed Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Minnesota. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI above 70 puts Unnamed Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. 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. Unnamed Lake ranks 96 of 97 in Otter Tail County — at the lower end of the locally monitored distribution.

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.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.3 ft of visibility. Trophic State Index: 73.

MetricValueGrade
Water Clarity (Secchi Depth)1.3 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)73Hypereutrophic

Very high nutrients, dense algae, poor clarity

Location

Loading map…

County Ranking

Ranked #96 of 97 lakes in Otter Tail County

Nearby Lakes in Otter Tail County

Hypereutrophic Lakes in Minnesota

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