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.
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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18.5 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 73 ft |
| Surface Area | 133.78 acres |
| Shoreline Length | 4.2 mi |
| Littoral Zone | 31% |
| Public Access | Yes |
Fish Species
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).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.295 m/yr | 4 |
Location
County Ranking
Ranked #5 of 142 lakes in Lake County
Nearby Lakes in Lake County
More Minnesota Lake Rankings
Other Grade A Lakes in Minnesota
Oligotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
15 surveys on file from MN DNR Fisheries. Most recent: 2024-04-22 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Fathead Minnow | 1583.75 | — |
| OTM | 231.50 | — |
| BST | 30.75 | — |
| IOD | 26.00 | — |
| White Sucker | 13.53 | 1.35 lb |
| PRD | 7.92 | 0.1 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
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…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Tofte Lake. 4 reports on file.
- —Fisheries Lake Survey — TofteFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Tofte (1889)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — TofteFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — ToftePublic Water Access Sites · MN DNR LakeFinder
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
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