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

Rush Lake

Day County, South Dakota1,463 acresView map Directions

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

Area

1,463 acres

Surface area

Shoreline

7.8 mi

Measured length

Impaired · Mercury
Limited data

See the measurements Directions Where to stay

Rush Lake in Day County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 1463 acres.

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Rush Lake is a 1,463-acre lake in Day County, South Dakota.

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

What Rush Lake is good for

From access and monitoring records, not editorial picks.

Big water1,463 acres

Swimming conditions

No reading

Limited data

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

Whether Rush 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 Rush Lake

These are the measurements SD DANR publishes for Rush 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 Rush Lake

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

Lake Details

Surface area

1,463 acres

Shoreline

7.8 mi

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

Stays via Stay22

Stays near Rush Lake

Compare lakeside cabins, hotels, and vacation rentals near Rush Lake in Day 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 Rush Lake

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Fishing Rush Lake

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

EPA Impairment Status

Rush 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: Aquatic life.

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

Source: EPA ATTAINS assessment unit SD-BS-L-RUSH_01 · Official waterbody report

Nearby Lakes in Day County

Minnewasta Lake2.5 miView →Little Rush Lake2.3 miView →Dahling Slough3.5 miView →Swan Pond4.3 miView →Phragmites Pond—View →Spring Lake—View →

Frequently asked questions about Rush Lake

Where is Rush Lake?: Rush Lake is a lake in Day 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 Rush Lake?: Rush Lake in Day County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 1463 acres.
Is Rush Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Rush Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.