Where is Wilmarth Lake?

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

Are there boat ramps on Wilmarth Lake?

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

Can I fish at Wilmarth Lake?

Wilmarth 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.

Wilmarth Lake

Aurora County, South Dakota106 acresView map Directions

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

Area

106 acres

Surface area

Shoreline

4.5 mi

Measured length

Impaired · Mercury
Public access
Limited data

See the measurements Directions Where to stay

Wilmarth Lake in Aurora County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 106 acres.

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Wilmarth Lake is a 106-acre lake in Aurora 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 Wilmarth Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Limited data

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

Whether Wilmarth 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 Wilmarth Lake

These are the measurements SD DANR publishes for Wilmarth 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 Wilmarth Lake

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

Lake Details

Surface area

106 acres

Shoreline

4.5 mi

Public access

Yes

Listed by SD DANR

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

Recreation & Access

Boat Landings

Yes

Public Access

Wilmarth Public Water AccessPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Wilmarth Lake

Compare lakeside cabins, hotels, and vacation rentals near Wilmarth Lake in Aurora 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 Wilmarth Lake

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Fishing Wilmarth Lake

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

EPA Impairment Status

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

Causes of impairment

MercurypH / acidity

Designated uses not supporting: Aquatic life.

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

Source: EPA ATTAINS assessment unit SD-JA-L-WILMARTH_01 · Official waterbody report

Nearby Lakes in Aurora County

Scott Lake8.3 miView →Schmitz Lake9.1 miView →White Lake8.8 miView →Crystal Lake15 miView →Fish Lake13.5 miView →Pleasant Lake—View →

Frequently asked questions about Wilmarth Lake

Where is Wilmarth Lake?: Wilmarth Lake is a lake in Aurora 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 Wilmarth Lake?: Wilmarth Lake in Aurora County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 106 acres.
Is Wilmarth Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Wilmarth Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pH / acidity. Check local advisories before you swim.
Are there boat ramps on Wilmarth Lake?: Wilmarth Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Wilmarth Public Water Access. Public access is listed as yes.
Can I fish at Wilmarth Lake?: Wilmarth 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.