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

Grass Lake

Jerauld County, South Dakota65 acresView map Directions

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

Area

65 acres

Surface area

Shoreline

1.5 mi

Measured length

Impaired · Algal growth
Limited data

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Grass Lake in Jerauld County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 65 acres.

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Grass Lake is a 65-acre lake in Jerauld County, South Dakota.

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

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Grass Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, oxygen depletion (low DO). Check local advisories before you swim.

Whether Grass 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 Grass Lake

These are the measurements SD DANR publishes for Grass 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.

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

Lake Details

Surface area

65 acres

Shoreline

1.5 mi

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

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Stays near Grass Lake

Compare lakeside cabins, hotels, and vacation rentals near Grass Lake in Jerauld 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.

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Fishing Grass Lake

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

EPA Impairment Status

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

Causes of impairment

Algal growthOxygen depletion (low DO)

Designated uses not supporting: Aquatic life, Recreation.

Source: EPA ATTAINS assessment unit SD-JA-L-TWIN_01 · Official waterbody report

Nearby Lakes in Jerauld County

Twin Lakes0.7 miView →Deans Lake16 miView →Bakers Lake—View →Long Lake—View →Cottonwood Lake—View →

Frequently asked questions about Grass Lake

Where is Grass Lake?: Grass Lake is a lake in Jerauld 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 Grass Lake?: Grass Lake in Jerauld County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 65 acres.
Is Grass Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Grass Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, oxygen depletion (low DO). Check local advisories before you swim.