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B

Hook Lake

Otter Tail County, MinnesotaLimited DataMesotrophic

On the LakeGrade scale Hook Lake grades a B, with clarity at 10.5 ft and phosphorus readings still being added placing it above the Minnesota median.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. 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. Hook Lake sits at rank 50 of 97 in Otter Tail County, in the lower half of the local distribution.

No invasive species are currently listed at Hook Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Hook Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. 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 2024-10-22. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 10.5 ft. Trophic State Index: 43.

MetricValueGrade
Water Clarity (Secchi Depth)10.5 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)43Mesotrophic

Moderate nutrients, good water quality

Location

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County Ranking

Ranked #50 of 97 lakes in Otter Tail County

Cleaner Lakes Within 30 Miles

Hook Lake holds Grade B. 5 nearby lakes hold higher grades.

Nearby Lakes in Otter Tail County

EPA Impairment Status

Hook Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN56-0532-02 · Official waterbody report · Matched by proximity (2.39 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

Most recent sample: 2024-10-22

Monitoring stations: 1