Skip to main content
LakeQuality
A

Tofte Lake

Lake County, MinnesotaLimited DataOligotrophic

Tofte Lake earns an A — every scored parameter (clarity) rates among the best monitored waters in Lake County.

Trophically, Tofte Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. At 73 ft of maximum depth, Tofte Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. The lake's 134 acres and 4.2 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within Lake County's 142 graded waters, Tofte Lake sits at rank 5, near the top of the local distribution.

Tofte Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The lake's fish records list 3 species — a varied community without one dominant gamefish. Public access is available — the lake is on the Minnesota PCA public-access list. 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 2023-09-12. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

Track Tofte Lake

Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 18.5 ft down. Trophic State Index: 35.

MetricValueGrade
Water Clarity (Secchi Depth)18.5 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)35Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth73 ft
Surface Area133.78 acres
Shoreline Length4.2 mi
Littoral Zone31%
Public AccessYes

Fish Species

rainbow trout,splake,white sucker

Click a species to see all Minnesota and Wisconsin lakes where it is found.

→ Best fishing times for Tofte Lake (14-day solunar calendar)

→ Is it safe to eat fish from Tofte Lake? (mercury & PFAS guide)

Tofte Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.295 m/yr4
See year-by-year chart →

Location

Loading map…

County Ranking

Ranked #5 of 142 lakes in Lake County

Nearby Lakes in Lake County

DNR Fisheries Survey Summary

15 surveys on file from MN DNR Fisheries. Most recent: 2024-04-22 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Fathead Minnow1583.75
OTM231.50
BST30.75
IOD26.00
White Sucker13.531.35 lb
PRD7.920.1 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.

White Sucker

366 fish · 620 in · 2021-04-26
5427068101214161820

From the 2024-04-22 survey

Tofte is a 134-acre designated stream trout lake located 14 miles east of Ely off the Fernberg Road. It is clear, has a maximum depth of 73 feet, and has generally rocky shorelines interspersed with areas of muck. Aquatic vegetation is largely limited to the shallow north bay. Four primitive campsites are present…

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 Tofte Lake. 4 reports on file.

EPA Impairment Status

Tofte 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 MN38-0714-00 · Official waterbody report · Matched by proximity (2.33 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: 2023-09-12

Monitoring stations: 1