Loon Lake
Loon Lake in Barron County, Wisconsin has a water quality grade of B (Good). Water clarity: 8.5 ft visibility. Phosphorus: 18.6 µg/L. Maximum depth: 26 ft. Surface area: 91 acres.
- Clarity
- 8.5 ft
- Max depth
- 26 ft
- Area
- 91 acres
- Type
- Mesotrophic
- Public access
- Yes
Next lake in Barron County
Loon Lake is a 91-acre mesotrophic lake in Barron County, Wisconsin with a maximum depth of 26 feet. Water quality is graded B based on 1 sampling years through 2020. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 27 other monitored lakes in Barron County, Loon Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-08-31. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Moderate clarity, visible to about 8.5 ft. Phosphorus level: 18.6 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | Not graded |
| Phosphorus | 18.6 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Loon Lake
Compare lakeside cabins, hotels, and vacation rentals near Loon Lake in Barron County, Wisconsin — 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 26 ft |
| Surface Area | 91 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Loon LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Loon Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2023).
Fish Species (DNR-rated)
County Ranking
Ranked #9 of 28 lakes in Barron County
Nearby Lakes in Barron County
Frequently asked questions about Loon Lake
What is the water quality grade for Loon Lake?
- Loon Lake in Barron County, Wisconsin has a water quality grade of B (Good). Water clarity: 8.5 ft visibility. Phosphorus: 18.6 µg/L. Maximum depth: 26 ft. Surface area: 91 acres.
Is Loon Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Loon Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Loon Lake?
- Loon Lake has a maximum depth of 26 feet. The lake covers 91 acres.
What fish are in Loon Lake?
- Fish species found in Loon Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Loon Lake is located in Barron County, Wisconsin.
Are there boat ramps on Loon Lake?
- Loon Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Loon Lake. Public access is listed as yes.
Explore Loon Lake across LakeGrade
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Barron County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
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State Parks Near Loon Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
6 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX6 samples · 2020
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory