Nigh Lake
St. Louis County, Minnesota41 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
Nigh Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Surface area: 41 acres.
Nigh Lake is a 41-acre lake in St. Louis County, Minnesota.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Nigh Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Nigh 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 Nigh Lake
These are the measurements Minnesota PCA publishes for Nigh 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 Nigh Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
41 acres
No bathymetric survey has been published for Nigh Lake, so its depth is not documented here.
Stays via Stay22
Stays near Nigh Lake
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Fishing Nigh Lake
EPA Impairment Status
Nigh 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: Fish consumption.
Source: EPA ATTAINS assessment unit MN69-0457-00 · Official waterbody report
Nearby Lakes in St. Louis County
Frequently asked questions about Nigh Lake
Where is Nigh Lake?
- Nigh Lake is a lake in St. Louis County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Nigh Lake?
- Nigh Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Surface area: 41 acres.
Is Nigh Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Nigh Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
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Where this data comes from
Measurements for Nigh 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