Oriniack Lake
St. Louis County, Minnesota733 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
- 17 ft max depth
Oriniack Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 17 ft. Surface area: 733 acres.
Oriniack Lake is a 733-acre lake in St. Louis County, Minnesota with a maximum depth of 17 feet.
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. Oriniack Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Oriniack 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 Oriniack Lake
These are the measurements Minnesota PCA publishes for Oriniack 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 Oriniack Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
17 ft
Surface area
733 acres
Shoreline
10.3 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
Stays via Stay22
Stays near Oriniack Lake
Compare lakeside cabins, hotels, and vacation rentals near Oriniack Lake in St. Louis County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Oriniack Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Follow Oriniack Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Oriniack Lake
EPA Impairment Status
Oriniack 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 MN69-0587-00 · Official waterbody report
Nearby Lakes in St. Louis County
Frequently asked questions about Oriniack Lake
Where is Oriniack Lake?
- Oriniack 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 Oriniack Lake?
- Oriniack Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 17 ft. Surface area: 733 acres.
Is Oriniack Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Oriniack Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Oriniack Lake?
- Oriniack Lake has a maximum depth of 17 feet. The lake covers 733 acres.
Explore Oriniack Lake across LakeQuality
Fish species and the cleanest lakes across Minnesota
Fish species and best lakes in St. Louis County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Lake Vermilion Area area
Where to stay at Minnesota's top lakes, each with its readings
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Lakes in the Rainy Lake Watershed, ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
More lakes in Minnesota
State Parks Near Oriniack Lake
Other Lakes in Minnesota
Where this data comes from
Measurements for Oriniack 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