Long Lake
Washington County, Minnesota32 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 7 ft max depth
Long Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 6.6 ft. Surface area: 32 acres.
Long Lake is a 32-acre lake in Washington County, Minnesota with a maximum depth of 7 feet.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Long 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 Long Lake
These are the measurements Minnesota PCA publishes for Long 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 Long Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
6.6 ft
Surface area
32 acres
Shoreline
1.4 mi
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Fishing Long Lake
EPA Impairment Status
Long 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: Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN82-0068-00 · Official waterbody report
Nearby Lakes in Washington County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long Lake is a lake in Washington County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Long Lake?
- Long Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 6.6 ft. Surface area: 32 acres.
Is Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Long Lake?
- Long Lake has a maximum depth of 6.6 feet. The lake covers 32 acres.
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Where this data comes from
Measurements for Long 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