Loon Lake
Burnett County, Wisconsin191 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Loon Lake. Here is what has been measured.
- Mesotrophic
- 28 ft max depth
- Public access
Loon Lake in Burnett County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 8.5 ft visibility. Phosphorus: 15 µg/L. Maximum depth: 28 ft. Surface area: 191 acres.
Wisconsin DNR lists Panfish as present on Loon Lake. DNR survey details →
Loon Lake is a 191-acre mesotrophic lake in Burnett County, Wisconsin with a maximum depth of 28 feet. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 29 other monitored lakes in Burnett County, Loon Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-26. Methodology: how these readings are compared.
What Loon Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing3 species recorded
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Loon Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Loon Lake
These are the measurements Wisconsin DNR publishes for Loon Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.5 ft. Phosphorus 15 µg/L. TSI 45.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 15µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 45 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Loon Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Loon Lake typically sits around 75°F at the surface in September. Summer average is about 76°F. Usually warmest in Jul (about 81°F) and coldest in Jun (about 73°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (73°F) to its warmest (81°F).
Typical surface water temperature by month, from 10 field readings (2024–2025) via the EPA Water Quality Portal. See the full Loon Lake water temperature breakdown →
Wisconsin DNR lists Panfish as present on Loon Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Loon Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2001. 3 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
28 ft
Surface area
191 acres
Public access
Yes
Listed by Wisconsin DNR
Recreation & Access
- Loon LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Loon Lake
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Follow Loon Lake’s readings
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Fish Species
Click a species to see every 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.
Water Quality Trend: Improving
Based on 7 years of monitoring (2020–2026).
Water clarity
Improving6 years
Phosphorus
Improving-0.9 µg/L/yr7 years
Reservoir Info (USACE NID)
Loon Lake is a man-made reservoir impounded by the Loon Lake (completed 1938), built primarily for recreation on the LOON CREEK; rockfill-type dam, 13 ft tall and 236 ft long.
- Surface area
- 228 ac
- Normal storage
- 2,280 ac-ft
- Max storage
- 3,800 ac-ft
- Drainage area
- 4.4 sq mi
- Hazard class
- Low
- Owner
- Burnett County
All listed purposes: Recreation;Other.
Source: USACE National Inventory of Dams, NID ID WI00243 · Operator website
Nearby Lakes in Burnett County
Frequently asked questions about Loon Lake
Where is Loon Lake?
- Loon Lake is a lake in Burnett County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Loon Lake?
- Loon Lake in Burnett County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 8.5 ft visibility. Phosphorus: 15 µg/L. Maximum depth: 28 ft. Surface area: 191 acres.
Is Loon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Loon Lake?
- Loon Lake typically sits around 75°F at the surface in September, from 10 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Loon Lake?
- Loon Lake has a maximum depth of 28 feet. The lake covers 191 acres.
What fish are in Loon Lake?
- Fish species found in Loon Lake include Panfish, Largemouth Bass, Northern Pike. Loon Lake is located in Burnett County, Wisconsin.
What did the DNR fisheries survey find at Loon Lake?
- Wisconsin DNR lists Panfish as present on Loon Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Loon Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
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.
Can I fish at Loon Lake?
- Loon Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Loon Lake across LakeQuality
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Where this data comes from
68 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX68 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
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
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory