Where is Isabel Lake?

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

Are there boat ramps on Isabel Lake?

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

Can I fish at Isabel Lake?

Isabel 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.

Isabel Lake

Dewey County, South Dakota108 acresView map Directions

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

Area

108 acres

Surface area

Shoreline

3.7 mi

Measured length

Impaired · Algal growth
Public access
Limited data

See the measurements Directions Where to stay

Isabel Lake in Dewey County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 108 acres.

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Isabel Lake is a 108-acre lake in Dewey 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 Isabel 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. Isabel Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.

Whether Isabel 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 Isabel Lake

These are the measurements SD DANR publishes for Isabel 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 Isabel Lake

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

Lake Details

Surface area

108 acres

Shoreline

3.7 mi

Public access

Yes

Listed by SD DANR

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

Recreation & Access

Boat Landings

Yes

Public Access

Isabel 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 Isabel Lake

Compare lakeside cabins, hotels, and vacation rentals near Isabel Lake in Dewey 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 Isabel Lake

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Fishing Isabel Lake

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

EPA Impairment Status

Isabel 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.

Source: EPA ATTAINS assessment unit SD-GR-L-ISABEL_01 · Official waterbody report

Nearby Lakes in Dewey County

Peach Lake10.8 miView →Livermant Lake11.3 miView →Horseshoe Lake11.5 miView →Timber Lake16.1 miView →Little Moreau Lake16.7 miView →Timber Lake17.2 miView →

Frequently asked questions about Isabel Lake

Where is Isabel Lake?: Isabel Lake is a lake in Dewey 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 Isabel Lake?: Isabel Lake in Dewey County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 108 acres.
Is Isabel Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Isabel 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 Isabel Lake?: Isabel Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Isabel Public Water Access. Public access is listed as yes.
Can I fish at Isabel Lake?: Isabel 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.