Gunflint Lake
Cook County, Minnesota2,164 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
- 200 ft max depth
Gunflint Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 200.1 ft. Surface area: 2164 acres.
Gunflint Lake is a 2,164-acre lake in Cook County, Minnesota with a maximum depth of 200 feet.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
What Gunflint Lake is good for
From access and monitoring records, not editorial picks.
- Deep water200.1 ft surveyed max depth
- Big water2,164 acres
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Gunflint Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Gunflint Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Gunflint Lake
These are the measurements Minnesota PCA publishes for Gunflint Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Gunflint Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
200.1 ft
Surface area
2,164 acres
Shoreline
21.6 mi
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Stays near Gunflint Lake
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Fishing Gunflint Lake
EPA Impairment Status
Gunflint Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN16-0356-00 · Official waterbody report
Nearby Lakes in Cook County
Frequently asked questions about Gunflint Lake
Where is Gunflint Lake?
- Gunflint Lake is a lake in Cook County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Gunflint Lake?
- Gunflint Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 200.1 ft. Surface area: 2164 acres.
Is Gunflint Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Gunflint Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Gunflint Lake?
- Gunflint Lake has a maximum depth of 200.1 feet. The lake covers 2164 acres.
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Where this data comes from
Measurements for Gunflint Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake details from Minnesota DNR LakeFinder