Where is Greenstone Lake?

Greenstone Lake is a lake in Lake County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.

How deep is Greenstone Lake?

Greenstone Lake has a maximum depth of 71.9 feet. The lake covers 329 acres.

Greenstone Lake

Lake County, Minnesota329 acresView map Directions

No nutrient or algae sampling on record from Minnesota PCA for this lake.

Max depth

71.9 ft

Bathymetric survey

Area

329 acres

Surface area

Shoreline

6.5 mi

Measured length

Impaired · Mercury
72 ft max depth

See the measurements Directions Where to stay

Greenstone Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 71.9 ft. Surface area: 329 acres.

Loading map…

Greenstone Lake is a 329-acre lake in Lake County, Minnesota with a maximum depth of 72 feet.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.

What Greenstone Lake is good for

From access and monitoring records, not editorial picks.

Deep water71.9 ft surveyed max depth

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Greenstone Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Greenstone 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.

Compare swimming lakes near Ely →

Get alerts for Greenstone Lake →

Water quality measurements for Greenstone Lake

These are the measurements Minnesota PCA publishes for Greenstone 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 Greenstone Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

71.9 ft

Surface area

329 acres

Shoreline

6.5 mi

Stays via Stay22

Stays near Greenstone Lake

Compare lakeside cabins, hotels, and vacation rentals near Greenstone Lake in Lake 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 Greenstone 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 Greenstone Lake’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Greenstone Lake

→ Greenstone Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Greenstone 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

Designated uses not supporting: Fish consumption.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN38-0718-00 · Official waterbody report

Nearby Lakes in Lake County

Madden Lake1.2 miView →Conchu Lake1 miView →Clear Lake2.2 miView →Rookie Lake2.3 miView →Pickerel Lake2.3 miView →Eskwagama Lake—View →

Frequently asked questions about Greenstone Lake

Where is Greenstone Lake?: Greenstone Lake is a lake in Lake County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Greenstone Lake?: Greenstone Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 71.9 ft. Surface area: 329 acres.
Is Greenstone Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Greenstone Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Greenstone Lake?: Greenstone Lake has a maximum depth of 71.9 feet. The lake covers 329 acres.