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D

Boot Lake

St. Louis County, MinnesotaLimited DataEutrophic

On the scoring rubric Boot Lake grades a D: clarity at 5.5 ft and phosphorus readings still being added keep it in the lower bracket for St. Louis County.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Boot Lake reaches 27 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. Boot Lake covers 323 acres alongside 7.3 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 187 graded lakes of St. Louis County, Boot Lake sits at rank 166, near the bottom of the county list.

No invasive species are currently listed at Boot Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Boot Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Boot 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 2022-08-02. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 5.5 ft. Trophic State Index: 53.

MetricValueGrade
Water Clarity (Secchi Depth)5.5 ftD
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)53Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth27 ft
Surface Area322.54 acres
Shoreline Length7.3 mi
Littoral Zone51%
Public AccessNo

Water Quality Trend: Declining

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.075 m/yr3

Location

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County Ranking

Ranked #166 of 187 lakes in St. Louis County

Cleaner Lakes Within 30 Miles

Boot Lake holds Grade D. One nearby lake has a higher grade.

Nearby Lakes in St. Louis County

Eutrophic Lakes in Minnesota

DNR Fisheries Survey Summary

1 survey on file from MN DNR Fisheries. Most recent: 1973-08-27 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Tullibee (Cisco)10.670.25 lb
Yellow Perch5.170.26 lb
Northern Pike2.502.73 lb
Walleye2.332.44 lb
White Sucker2.002.23 lb
Rock Bass1.830.42 lb

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

From the 1973-08-27 survey

(mod. heavy. The main components are well used The only gamefish present are walleye and northern pike. The walleye population is low in numbers and composed of older (age IV+) fish. The northern pike population is about average. Other fish include white sucker (average. size population.) Yellow perch (about average…

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 Boot Lake. 1 report on file.

EPA Impairment Status

Boot Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Source: EPA ATTAINS assessment unit MN38-0813-00 · Official waterbody report · Matched by proximity (1.63 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

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2022-08-02

Monitoring stations: 1