Clear Lake is a lake in Marshall County, South Dakota. Its water-quality measurements are published by SD DANR and shown on this page as reported.

Are there boat ramps on Clear Lake?

Clear Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Clear Lake Land Use Area. Public access is listed as yes.

Can I fish at Clear Lake?

Clear 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 South Dakota's fish and wildlife agency, so check its current regulations before you go.

Clear Lake

Marshall County, South Dakota1,199 acresView map Directions

No nutrient or algae sampling on record from SD DANR for this lake.

Area

1,199 acres

Surface area

Shoreline

8.1 mi

Measured length

Impaired · Mercury
Public access
Limited data

See the measurements Directions Where to stay

Clear Lake in Marshall County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 1199 acres.

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Clear Lake is a 1,199-acre lake in Marshall County, South Dakota. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, SD DANR. Methodology: how these readings are compared.

What Clear Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Big water1,199 acres

Swimming conditions

No reading

Limited data

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

Whether Clear Lake is safe to swim in today is a call for the South Dakota Department of Agriculture and Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Clear Lake

These are the measurements SD DANR publishes for Clear 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.

Ask about Clear Lake

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

Lake Details

Surface area

1,199 acres

Shoreline

8.1 mi

Public access

Yes

Listed by SD DANR

No bathymetric survey has been published for Clear Lake, so its depth is not documented here.

Recreation & Access

Boat Landings

Yes

Public Access

Clear Lake Land Use AreaPublic

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 Clear Lake

Compare lakeside cabins, hotels, and vacation rentals near Clear Lake in Marshall County, South Dakota — 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 Clear Lake

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Fishing Clear Lake

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

EPA Impairment Status

Clear 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: Aquatic life.

Source: EPA ATTAINS assessment unit SD-JA-L-CLEAR_M_01 · Official waterbody report

Nearby Lakes in Marshall County

Simmon Lake1.9 miView →North Red Iron Lake1.5 miView →Long Lake2.6 miView →South Red Iron Lake2.6 miView →Crystal Lake—View →Goodbird Lake3.2 miView →

Frequently asked questions about Clear Lake

Where is Clear Lake?: Clear Lake is a lake in Marshall County, South Dakota. Its water-quality measurements are published by SD DANR and shown on this page as reported.
What is the water quality of Clear Lake?: Clear Lake in Marshall County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 1199 acres.
Is Clear Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Clear Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Are there boat ramps on Clear Lake?: Clear Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Clear Lake Land Use Area. Public access is listed as yes.
Can I fish at Clear Lake?: Clear 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 South Dakota's fish and wildlife agency, so check its current regulations before you go.