Sylvan Lake
Cass County, Minnesota884 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
- 57 ft max depth
Sylvan Lake in Cass County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 57 ft. Surface area: 884 acres.
Sylvan Lake is a 884-acre lake in Cass County, Minnesota with a maximum depth of 57 feet.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
What Sylvan Lake is good for
From access and monitoring records, not editorial picks.
- Deep water57 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Sylvan Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Sylvan Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sylvan Lake
These are the measurements Minnesota PCA publishes for Sylvan 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 Sylvan Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
57 ft
Surface area
884 acres
Shoreline
10.4 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Stays near Sylvan Lake
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Fishing Sylvan Lake
EPA Impairment Status
Sylvan Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN11-0304-01 · Official waterbody report
Nearby Lakes in Cass County
Frequently asked questions about Sylvan Lake
Where is Sylvan Lake?
- Sylvan Lake is a lake in Cass County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Sylvan Lake?
- Sylvan Lake in Cass County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 57 ft. Surface area: 884 acres.
Is Sylvan Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sylvan Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Sylvan Lake?
- Sylvan Lake has a maximum depth of 57 feet. The lake covers 884 acres.
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Where this data comes from
Measurements for Sylvan 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
Lake details from Minnesota DNR LakeFinder