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B

Fraser Lake

Lake County, MinnesotaLimited DataMesotrophic

On the LakeGrade scale Fraser Lake grades a B, with clarity at 11.0 ft and phosphorus readings still being added placing it above the Minnesota median.

A TSI near 43 places Fraser Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 105 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Fraser Lake covers 695 acres alongside 14.6 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 142 graded lakes in Lake County, Fraser Lake ranks 35 — in the top quartile locally.

No invasive species are currently listed at Fraser Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Fraser Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Fraser 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 2023-07-07. 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 11 ft. Trophic State Index: 43.

MetricValueGrade
Water Clarity (Secchi Depth)11 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)43Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth105 ft
Surface Area695.05 acres
Shoreline Length14.6 mi
Littoral Zone23%
Public AccessNo

Water Quality Trend: Declining

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.771 m/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #35 of 142 lakes in Lake County

Nearby Lakes in Lake County

DNR Fisheries Survey Summary

3 surveys on file from MN DNR Fisheries. Most recent: 2025-08-03 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Tullibee (Cisco)15.220.11 lb
Lake Trout1.442.01 lb
White Sucker0.951.18 lb
Northern Pike0.253.5 lb
BUB0.101.2 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

From the 2025-08-03 survey

Temperature and dissolved oxygen measurements were collected from the deepest basin in Fraser Lake on August 3rd, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake (Cisco, also…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Fraser Lake. 1 report on file.

EPA Impairment Status

Fraser 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 MN38-0372-00 · Official waterbody report

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

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2023-07-07

Monitoring stations: 10