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F

Henry Lake

Stearns County, MinnesotaLimited DataHypereutrophic

Henry Lake grades an F: every scored parameter (clarity) rates poorly, placing it among the most stressed lakes monitored in Minnesota.

A TSI above 70 puts Henry 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. Within the 55 graded lakes of Stearns County, Henry Lake sits at rank 54, near the bottom of the county list.

No invasive species are currently listed at Henry Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Henry 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 2024-09-01. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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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 0.5 ft of visibility. Trophic State Index: 87.

MetricValueGrade
Water Clarity (Secchi Depth)0.5 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)87Hypereutrophic

Very high nutrients, dense algae, poor clarity

Location

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County Ranking

Ranked #54 of 55 lakes in Stearns County

Cleaner Lakes Within 30 Miles

Henry Lake holds Grade F. One nearby lake has a higher grade.

Nearby Lakes in Stearns 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: 2024-09-01

Monitoring stations: 1