Slough Lake
Lake County, Illinois38 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 19 ft max depth
Slough Lake in Lake County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 19 ft. Surface area: 38 acres.
Slough Lake is a 38-acre lake in Lake County, Illinois with a maximum depth of 19 feet (8-foot average).
Source: EPA Water Quality Portal sampling records, Illinois EPA. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Slough Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), turbidity. Check local advisories before you swim.
Whether Slough 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 Slough Lake
These are the measurements Illinois EPA publishes for Slough 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 Slough Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
19 ft
Average depth
8 ft
Surface area
38 acres
Shoreline
1.1 mi
Stays via Stay22
Stays near Slough Lake
Compare lakeside cabins, hotels, and vacation rentals near Slough Lake in Lake 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.
Top-rated places to stay near Slough Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Illinois’s top lakes →
Follow Slough Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Slough Lake
EPA Impairment Status
Slough 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: Aquatic life, Other.
Source: EPA ATTAINS assessment unit IL_RGZE · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Slough Lake
Where is Slough Lake?
- Slough Lake is a lake in Lake County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Slough Lake?
- Slough Lake in Lake County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 19 ft. Surface area: 38 acres.
Is Slough Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Slough Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), turbidity. Check local advisories before you swim.
How deep is Slough Lake?
- Slough Lake has a maximum depth of 19 feet and an average depth of 8 feet. The lake covers 38 acres.
Explore Slough Lake across LakeQuality
Species activity outlook by water temperature and season
Top lakes and where to stay in the Chain O'Lakes area
Where to stay at Illinois's top lakes, each with its readings
Illinois's cleanest lakes, ranked on agency measurements
More lakes in Illinois
Other Lakes in Illinois
Where this data comes from
Measurements for Slough 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