Where is Minnewasta Lake?

Minnewasta 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.

Are there boat ramps on Minnewasta Lake?

Minnewasta Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Sunnybrook Public Water Access. Public access is listed as yes.

Can I fish at Minnewasta Lake?

Minnewasta 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.

Minnewasta Lake

Day County, South Dakota610 acresView map Directions

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

Area

610 acres

Surface area

Shoreline

5.8 mi

Measured length

Impaired · Algal growth
Public access
Limited data

See the measurements Directions Where to stay

Minnewasta Lake in Day County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 610 acres.

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Minnewasta Lake is a 610-acre lake in Day 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 Minnewasta 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. Minnewasta Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.

Whether Minnewasta 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 Minnewasta Lake

These are the measurements SD DANR publishes for Minnewasta 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 Minnewasta Lake

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

Lake Details

Surface area

610 acres

Shoreline

5.8 mi

Public access

Yes

Listed by SD DANR

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

Recreation & Access

Boat Landings

Yes

Public Access

Sunnybrook Public Water AccessPublic

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 Minnewasta Lake

Compare lakeside cabins, hotels, and vacation rentals near Minnewasta 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 Minnewasta Lake

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Fishing Minnewasta Lake

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

EPA Impairment Status

Minnewasta 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 growthMercury

Designated uses not supporting: Aquatic life, Recreation.

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

Source: EPA ATTAINS assessment unit SD-BS-L-MINNEWASTA_01 · Official waterbody report

Nearby Lakes in Day County

Dahling Slough1 miView →Swan Pond1.9 miView →Phragmites Pond2.3 miView →Rush Lake2.5 miView →Spring Lake2.6 miView →Hillebrands Lake3.2 miView →

Frequently asked questions about Minnewasta Lake

Where is Minnewasta Lake?: Minnewasta 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 Minnewasta Lake?: Minnewasta Lake in Day County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 610 acres.
Is Minnewasta Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Minnewasta Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.
Are there boat ramps on Minnewasta Lake?: Minnewasta Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Sunnybrook Public Water Access. Public access is listed as yes.
Can I fish at Minnewasta Lake?: Minnewasta 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.