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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 27 ft |
| Surface Area | 322.54 acres |
| Shoreline Length | 7.3 mi |
| Littoral Zone | 51% |
| Public Access | No |
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.075 m/yr | 3 |
Location
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
More Minnesota Lake Rankings
State Parks Near Boot Lake
Other Grade D Lakes in Minnesota
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
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Tullibee (Cisco) | 10.67 | 0.25 lb |
| Yellow Perch | 5.17 | 0.26 lb |
| Northern Pike | 2.50 | 2.73 lb |
| Walleye | 2.33 | 2.44 lb |
| White Sucker | 2.00 | 2.23 lb |
| Rock Bass | 1.83 | 0.42 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…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Boot Lake. 1 report on file.
- —Fisheries Lake Survey — BootFisheries Lake Survey · MN DNR LakeFinder
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
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