Where is South Twin Lake?

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

How deep is South Twin Lake?

South Twin Lake has a maximum depth of 47.1 feet. The lake covers 112 acres.

Are there boat ramps on South Twin Lake?

South Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include South Twin Lake. Public access is listed as yes.

Can I fish at South Twin Lake?

South Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.

South Twin Lake

St. Louis County, Minnesota112 acresView map Directions

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

Max depth

47.1 ft

Bathymetric survey

Area

112 acres

Surface area

Shoreline

2 mi

Measured length

Impaired · Mercury
47 ft max depth
Public access

See the measurements Directions Where to stay

South Twin Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 47.1 ft. Surface area: 112 acres.

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South Twin Lake is a 112-acre lake in St. Louis County, Minnesota with a maximum depth of 47 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

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

What South Twin Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water47.1 ft surveyed max depth

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. South Twin Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether South Twin 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.

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Water quality measurements for South Twin Lake

These are the measurements Minnesota PCA publishes for South Twin 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 South Twin Lake

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

Lake Details

Max depth

47.1 ft

Surface area

112 acres

Shoreline

2 mi

Public access

Yes

Listed by Minnesota PCA

The depth above comes from a bathymetric survey of this lake, not from a regional estimate.

Recreation & Access

Boat Landings

Yes

Public Access

South Twin LakePublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

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Stays near South Twin Lake

Compare lakeside cabins, hotels, and vacation rentals near South Twin Lake in St. Louis 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 South Twin Lake

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Fishing South Twin Lake

→ South Twin Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

South Twin Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

Source: EPA ATTAINS assessment unit MN69-0420-00 · Official waterbody report

Nearby Lakes in St. Louis County

Twin Lakes0.5 miView →Turpela Lake1.3 miView →Hautala Lake2.4 miView →Neff Lake2.1 miView →Kumpula Lake2.8 miView →Frying Pan Lake2.4 miView →

Frequently asked questions about South Twin Lake

Where is South Twin Lake?: South Twin Lake is a lake in St. Louis County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of South Twin Lake?: South Twin Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 47.1 ft. Surface area: 112 acres.
Is South Twin Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. South Twin Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is South Twin Lake?: South Twin Lake has a maximum depth of 47.1 feet. The lake covers 112 acres.
Are there boat ramps on South Twin Lake?: South Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include South Twin Lake. Public access is listed as yes.
Can I fish at South Twin Lake?: South Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.