Washington County Lake
Washington County, Illinois287 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Mercury
- 23 ft max depth
- Public access
Washington County Lake in Washington County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 23 ft. Surface area: 287 acres.
Washington County Lake is a 287-acre lake in Washington County, Illinois with a maximum depth of 23 feet (9-foot average). Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Illinois EPA. Methodology: how these readings are compared.
What Washington County Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Washington County Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Washington County Lake is safe to swim in today is a call for the Illinois Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Washington County Lake
These are the measurements Illinois EPA publishes for Washington County 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 Washington County Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
23 ft
Average depth
9 ft
Surface area
287 acres
Shoreline
16.1 mi
Public access
Yes
Listed by Illinois EPA
Recreation & Access
- Washington County LakePublic
- Washington County LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Washington County Lake
Compare lakeside cabins, hotels, and vacation rentals near Washington County Lake in Washington County, Illinois — 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.
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Fishing Washington County Lake
EPA Impairment Status
Washington County Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Fish consumption, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_RNM · Official waterbody report
Nearby Lakes in Washington County
Frequently asked questions about Washington County Lake
Where is Washington County Lake?
- Washington County Lake is a lake in Washington County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Washington County Lake?
- Washington County Lake in Washington County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 23 ft. Surface area: 287 acres.
Is Washington County Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Washington County Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Washington County Lake?
- Washington County Lake has a maximum depth of 23 feet and an average depth of 9 feet. The lake covers 287 acres.
Are there boat ramps on Washington County Lake?
- Washington County Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Washington County Lake, Washington County Lake. Public access is listed as yes.
Can I fish at Washington County Lake?
- Washington County Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Illinois's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
Measurements for Washington County Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory