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

Are there boat ramps on Opitz Lake?

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

Can I fish at Opitz Lake?

Opitz 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.

Opitz Lake

Marshall County, South Dakota1,664 acresView map Directions

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

Area

1,664 acres

Surface area

Shoreline

16.6 mi

Measured length

Impaired · Mercury
Public access

See the measurements Directions Where to stay

Opitz Lake in Marshall County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 1664 acres.

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Opitz Lake is a 1,664-acre lake in Marshall 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 Opitz Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Big water1,664 acres

Swimming conditions

No reading

Not rated

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

Whether Opitz 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 Opitz Lake

These are the measurements SD DANR publishes for Opitz 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. TSI undefined.

Ask about Opitz Lake

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

Lake Details

Surface area

1,664 acres

Shoreline

16.6 mi

Public access

Yes

Listed by SD DANR

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

Recreation & Access

Boat Landings

Yes

Public Access

Opitz 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 Opitz Lake

Compare lakeside cabins, hotels, and vacation rentals near Opitz Lake in Marshall 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 Opitz Lake

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Fishing Opitz Lake

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

EPA Impairment Status

Opitz 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-JA-L-OPITZ_01 · Official waterbody report

Nearby Lakes in Marshall County

Redman Slough1.7 miView →Parsons Pass4.4 miView →Lost Lake5.9 miView →Horseshoe Lake6.1 miView →Mallard Slough6 miView →Alberts Lake5.6 miView →

Frequently asked questions about Opitz Lake

Where is Opitz Lake?: Opitz Lake is a lake in Marshall 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 Opitz Lake?: Opitz Lake in Marshall County, South Dakota has water-quality measurements published by SD DANR, shown here as reported. Surface area: 1664 acres.
Is Opitz Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Opitz Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Are there boat ramps on Opitz Lake?: Opitz Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Opitz Public Water Access. Public access is listed as yes.
Can I fish at Opitz Lake?: Opitz 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.