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LakeQuality
B

Perch Lake

Crow Wing County, MinnesotaMesotrophic

Perch Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Minnesota norms.

A TSI near 48 places Perch Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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 120 graded lakes of Crow Wing County, Perch Lake sits at rank 96, near the bottom of the county list.

No invasive species are currently listed at Perch Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Perch Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Perch Lake — most use is by shoreline residents and their guests. 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 2020-09-23. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Murky, only visible to about 5.9 ft. Phosphorus level: 16.5 µg/L. Trophic State Index: 48.

MetricValueGrade
Water Clarity (Secchi Depth)5.9 ftD
Phosphorus16.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)48Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Improving

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+2.94 m/yr2

Location

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County Ranking

Ranked #96 of 120 lakes in Crow Wing County

Nearby Lakes in Crow Wing County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2020-09-23

Monitoring stations: 1