Where is Long Tom Lake?

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

How deep is Long Tom Lake?

Long Tom Lake has a maximum depth of 12.4 feet. The lake covers 135 acres.

Are there boat ramps on Long Tom Lake?

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

Can I fish at Long Tom Lake?

Long Tom 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.

Long Tom Lake

Big Stone County, Minnesota135 acresView map Directions

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

Max depth

12.4 ft

Bathymetric survey

Area

135 acres

Surface area

Shoreline

4.5 mi

Measured length

Impaired · Nutrients (phosphorus, nitrogen)
12 ft max depth
Public access

See the measurements Directions Where to stay

Long Tom Lake in Big Stone County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 12.4 ft. Surface area: 135 acres.

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Long Tom Lake is a 135-acre lake in Big Stone County, Minnesota with a maximum depth of 12 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 Long Tom Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Recreation use not supported

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

Whether Long Tom 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 Long Tom Lake

These are the measurements Minnesota PCA publishes for Long Tom 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 Long Tom Lake

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

Lake Details

Max depth

12.4 ft

Surface area

135 acres

Shoreline

4.5 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

Long Tom 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 Long Tom Lake

Compare lakeside cabins, hotels, and vacation rentals near Long Tom Lake in Big Stone 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.

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Fishing Long Tom Lake

→ Long Tom Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Long Tom Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)

Designated uses not supporting: Recreation.

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

Source: EPA ATTAINS assessment unit MN06-0029-00 · Official waterbody report

Nearby Lakes in Big Stone County

Unnamed Lake2 ft clear0.8 miView →Munnwyler Lake1.4 miView →Walter Lake1.5 miView →Peterson Lake1.6 miView →Twin Lakes2.1 miView →Otrey Lake1 ft clear2.6 miView →

Frequently asked questions about Long Tom Lake

Where is Long Tom Lake?: Long Tom Lake is a lake in Big Stone County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Long Tom Lake?: Long Tom Lake in Big Stone County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 12.4 ft. Surface area: 135 acres.
Is Long Tom Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Long Tom Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Long Tom Lake?: Long Tom Lake has a maximum depth of 12.4 feet. The lake covers 135 acres.
Are there boat ramps on Long Tom Lake?: Long Tom Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Long Tom Lake. Public access is listed as yes.
Can I fish at Long Tom Lake?: Long Tom 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.