Ruby Lake
Itasca County, Minnesota235 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
- 88 ft max depth
Ruby Lake in Itasca County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 87.9 ft. Surface area: 235 acres.
Ruby Lake is a 235-acre lake in Itasca County, Minnesota with a maximum depth of 88 feet.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
What Ruby Lake is good for
From access and monitoring records, not editorial picks.
- Deep water87.9 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Ruby Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Ruby 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 Ruby Lake
These are the measurements Minnesota PCA publishes for Ruby 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 Ruby Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
87.9 ft
Surface area
235 acres
Shoreline
4.1 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Ruby Lake
EPA Impairment Status
Ruby 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 MN31-0422-00 · Official waterbody report
Nearby Lakes in Itasca County
Frequently asked questions about Ruby Lake
Where is Ruby Lake?
- Ruby Lake is a lake in Itasca County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Ruby Lake?
- Ruby Lake in Itasca County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 87.9 ft. Surface area: 235 acres.
Is Ruby Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Ruby Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Ruby Lake?
- Ruby Lake has a maximum depth of 87.9 feet. The lake covers 235 acres.
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Where this data comes from
Measurements for Ruby 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