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LakeQuality
B

Toe Lake

St. Louis County, MinnesotaLimited DataOligotrophic

Toe Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Trophically, Toe Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's 57 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. At 169 acres, Toe Lake fits the Minnesota median for monitored lakes, with 2.8 miles of shoreline. Toe Lake ranks 72 of 187 in St. Louis County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Toe Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Toe 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. 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 2022-06-18. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 13.5 ft. Trophic State Index: 40.

MetricValueGrade
Water Clarity (Secchi Depth)13.5 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)40Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth57 ft
Surface Area169.04 acres
Shoreline Length2.8 mi
Littoral Zone24%
Public AccessNo

Location

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County Ranking

Ranked #72 of 187 lakes in St. Louis County

Nearby Lakes in St. Louis County

DNR Fisheries Survey Summary

2 surveys on file from MN DNR Fisheries. Most recent: 2025-07-31 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Walleye8.333.13 lb
Northern Pike6.003.62 lb
Rock Bass3.000.12 lb
Tullibee (Cisco)1.500.13 lb
Smallmouth Bass1.000.53 lb
Pumpkinseed0.830.04 lb

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

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Walleye

50 fish · 1527 in · 2002-09-09
1370trophy 2415161718192021222324252627

Northern Pike

36 fish · 1339 in · 2002-09-09
740trophy 3614161820222426283032343638

Rock Bass

18 fish · 46 in · 2002-09-09
1260456

Tullibee (Cisco)

9 fish · 78 in · 2002-09-09
74078

From the 2025-07-31 survey

Temperature and dissolved oxygen (DO) measurements were collected from the deepest basin in Toe Lake on July 31st, 2025, to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee, the most sensitive coldwater species present in this lake.…

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 Toe Lake. 1 report on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2022-06-18

Monitoring stations: 1