Triangle Lake
Cook County, Minnesota39 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- 15 ft max depth
Triangle Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 15 ft. Surface area: 39 acres.
Triangle Lake is a 39-acre lake in Cook County, Minnesota with a maximum depth of 15 feet.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Triangle 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 Triangle Lake
These are the measurements Minnesota PCA publishes for Triangle 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 Triangle Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
15 ft
Surface area
39 acres
Shoreline
1.6 mi
Stays via Stay22
Stays near Triangle Lake
Compare lakeside cabins, hotels, and vacation rentals near Triangle Lake in Cook County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Triangle Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Follow Triangle Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Triangle Lake
Nearby Lakes in Cook County
Frequently asked questions about Triangle Lake
Where is Triangle Lake?
- Triangle 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 Triangle Lake?
- Triangle Lake in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 15 ft. Surface area: 39 acres.
Is Triangle Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Triangle Lake?
- Triangle Lake has a maximum depth of 15 feet. The lake covers 39 acres.
Explore Triangle Lake across LakeQuality
Fish species and the cleanest lakes across Minnesota
Fish species and best lakes in Cook County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its readings
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
More lakes in Minnesota
State Parks Near Triangle Lake
Other Lakes in Minnesota
Where this data comes from
Measurements for Triangle Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Lake details from Minnesota DNR LakeFinder