Salem Reservoir
Marion County, Illinois65 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Mercury
- 14 ft max depth
Salem Reservoir in Marion County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 14 ft. Surface area: 65 acres.
Salem Reservoir is a 65-acre lake in Marion County, Illinois with a maximum depth of 14 feet (7-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. Salem Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity, turbidity. Check local advisories before you swim.
Whether Salem Reservoir 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 Salem Reservoir
These are the measurements Illinois EPA publishes for Salem Reservoir, 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 Salem Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
14 ft
Average depth
7 ft
Surface area
65 acres
Shoreline
3.8 mi
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Fishing Salem Reservoir
EPA Impairment Status
Salem Reservoir 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, Fish consumption, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_ROR · Official waterbody report
Nearby Lakes in Marion County
Frequently asked questions about Salem Reservoir
Where is Salem Reservoir?
- Salem Reservoir is a lake in Marion County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Salem Reservoir?
- Salem Reservoir in Marion County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 14 ft. Surface area: 65 acres.
Is Salem Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Salem Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity, turbidity. Check local advisories before you swim.
How deep is Salem Reservoir?
- Salem Reservoir has a maximum depth of 14 feet and an average depth of 7 feet. The lake covers 65 acres.
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Where this data comes from
Measurements for Salem Reservoir 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