Island Lake Reservoir
St. Louis County, MinnesotaView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
- spiny waterflea
- 103 ft max depth
- Public access
- Limited data
Island Lake Reservoir in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported.
Island Lake Reservoir is a lake in St. Louis County, Minnesota with an estimated average depth of about 103 feet. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-05-29. Methodology: how these readings are compared.
What Island Lake Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch3 documented ramps
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Island Lake Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Island Lake Reservoir 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 Island Lake Reservoir
These are the measurements Minnesota PCA publishes for Island Lake Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Island Lake Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~103 ft est.
Public access
Yes
Listed by Minnesota PCA
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Minnesota has not published bathymetry for Island Lake Reservoir.
Lake Size & Watershed
Watershed (drainage) area
528 sq mi
HydroLAKES / HydroSHEDS
Surface area
7,823 acres
HydroLAKES / HydroSHEDS
Shoreline
61.7 mi
HydroLAKES / HydroSHEDS
Elevation
1,352 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Island Lake, Abbot Road (East)Public
- Island Lake (North)Public
- Dam SitePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Island Lake Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Island Lake Reservoir 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 Island Lake Reservoir
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Fishing Island Lake Reservoir
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
EPA Impairment Status
Island Lake Reservoir 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 MN69-0372-01 · Official waterbody report
Nearby Lakes in St. Louis County
Frequently asked questions about Island Lake Reservoir
Where is Island Lake Reservoir?
- Island Lake Reservoir 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 Island Lake Reservoir?
- Island Lake Reservoir in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported.
Is Island Lake Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Island Lake Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Island Lake Reservoir?
- No published bathymetric survey covers Island Lake Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 103 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Island Lake Reservoir?
- Island Lake Reservoir has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Island Lake, Abbot Road (East), Island Lake (North), Dam Site. Public access is listed as yes.
Can I fish at Island Lake Reservoir?
- Island Lake Reservoir has 3 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Island Lake Reservoir across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA2 samples · 2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory