Loon Lake
Loon Lake in Chippewa County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4.9 ft visibility. Phosphorus: 32.1 µg/L. Maximum depth: 9 ft. Surface area: 134 acres.
- Clarity
- 4.9 ft
- Max depth
- 9 ft
- Area
- 134 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Chippewa County
Loon Lake is a 134-acre productive, nutrient-rich eutrophic lake in Chippewa County, Wisconsin with a maximum depth of 9 feet. Water quality is graded C based on 1 sampling years through 2020. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Panfish and Northern Pike. Public access is available with 1 public boat landing. Compared to the 6 other monitored lakes in Chippewa County, Loon Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-09-14. 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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Murky, only visible to about 4.9 ft. Phosphorus level: 32.1 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | Not graded |
| Phosphorus | 32.1 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Loon Lake
Compare lakeside cabins, hotels, and vacation rentals near Loon Lake in Chippewa 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.
Top-rated places to stay near Loon Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 9 ft |
| Surface Area | 134 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
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2020).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.48 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.02 µg/L/yr | 6 |
EPA Impairment Status
Loon Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10008932 · Official waterbody report · Matched by proximity (1.7 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Loon Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- New Auburn Wastewater Treatment FacilityNew Auburn · 4.6 mi away · NPDES WI0030635Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #5 of 7 lakes in Chippewa County
Nearby Lakes With Higher Grades
Loon Lake holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Chippewa County
Frequently asked questions about Loon Lake
What is the water quality grade for Loon Lake?
- Loon Lake in Chippewa County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4.9 ft visibility. Phosphorus: 32.1 µg/L. Maximum depth: 9 ft. Surface area: 134 acres.
Is Loon Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Loon Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
How deep is Loon Lake?
- Loon Lake has a maximum depth of 9 feet. The lake covers 134 acres.
What fish are in Loon Lake?
- Fish species found in Loon Lake include Panfish, Northern Pike. Loon Lake is located in Chippewa 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
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Fish species and best lakes in Chippewa County
Species activity outlook by water temperature and season
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Lakes in the Chippewa River Watershed, ranked by water quality
High nutrients, frequent algae, reduced clarity
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State Parks Near Loon Lake
Other Grade C Lakes in Wisconsin
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Where this data comes from
4 measurements from 2 monitoring stations, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX4 samples · 2020
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
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