Twin Bear Lake
Bayfield County, Wisconsin157 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Twin Bear Lake. Here is what has been measured.
- Rusty Crayfish
- 59 ft max depth
- Public access
- Limited data
Twin Bear Lake in Bayfield County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 19.5 ft visibility. Maximum depth: 59 ft. Surface area: 157 acres.
Wisconsin DNR rates Largemouth Bass as abundant on Twin Bear Lake. DNR survey details →
Twin Bear Lake is a 157-acre lake in Bayfield County, Wisconsin with a maximum depth of 59 feet. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-29. Methodology: how these readings are compared.
Twin Bear Lake covers about 160 acres in Bayfield County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Twin Bear Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Twin Bear Lake is good for
From access and monitoring records, not editorial picks.
- Clear water19.5 ft of visibility
- Boat launch1 documented ramp
- Fishing6 species recorded
- Deep water59 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Twin Bear 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 Twin Bear Lake
These are the measurements Wisconsin DNR publishes for Twin Bear Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 19.5 ft down. TSI 34.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 19.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| 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. | 34 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Twin Bear Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR rates Largemouth Bass as abundant on Twin Bear Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Twin Bear 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 1993. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
59 ft
Surface area
157 acres
Public access
Yes
Listed by Wisconsin DNR
Recreation & Access
- Twin Bear County ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Twin Bear Lake
Compare lakeside cabins, hotels, and vacation rentals near Twin Bear Lake in Bayfield 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 Twin Bear Lake
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Follow Twin Bear Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Twin Bear 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
Stable0 µg/L/yr7 years
Nearby Lakes in Bayfield County
Frequently asked questions about Twin Bear Lake
Where is Twin Bear Lake?
- Twin Bear Lake is a lake in Bayfield County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Twin Bear Lake?
- Twin Bear Lake in Bayfield County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 19.5 ft visibility. Maximum depth: 59 ft. Surface area: 157 acres.
Is Twin Bear Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Twin Bear Lake?
- Twin Bear Lake has a maximum depth of 59 feet. The lake covers 157 acres.
What fish are in Twin Bear Lake?
- Fish species found in Twin Bear Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Twin Bear Lake is located in Bayfield County, Wisconsin.
What did the DNR fisheries survey find at Twin Bear Lake?
- Wisconsin DNR rates Largemouth Bass as abundant on Twin Bear Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Twin Bear 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 Twin Bear Lake?
- Twin Bear Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Twin Bear County Park. Public access is listed as yes.
Can I fish at Twin Bear Lake?
- Twin Bear 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.
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Where this data comes from
20 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX20 samples · 2023–2025
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