Stone Lake
Stone Lake in Washburn County, Wisconsin has a water quality grade of B (Good). Water clarity: 23 ft visibility. Phosphorus: 11.2 µg/L. Maximum depth: 49 ft. Surface area: 490 acres.
Wisconsin DNR rates Smallmouth Bass and Walleye as abundant on Stone Lake. DNR survey details →
- Clarity
- 23 ft
- Max depth
- 49 ft
- Area
- 490 acres
- Type
- Oligotrophic
- Trend
- ↓ Declining
- Public access
- Yes
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Stone Lake is a 490-acre cold, clear oligotrophic lake in Washburn County, Wisconsin with a maximum depth of 49 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 5 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available with 2 public boat landings. Compared to the 26 other monitored lakes in Washburn County, Stone Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-31. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
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)
Crystal clear, you can see 23 ft down. Phosphorus level: 11.2 µg/L. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 23 ft | Not graded |
| Phosphorus | 11.2 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Stone Lake
Compare lakeside cabins, hotels, and vacation rentals near Stone Lake in Washburn 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 Stone Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Stone Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was high (128,233 cells/mL) on May 2, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Wisconsin DNR rates Smallmouth Bass and Walleye as abundant on Stone Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Stone Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is declining. 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 1987. 4 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Stone Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2023Stone Lake comprehensive survey, 2023Comprehensive Survey · WI DNR · 2023 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 49 ft |
| Surface Area | 490 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Stone LakePublic
- Spring LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Stone 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: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.271 m/yr | 6 |
| Phosphorus | ↓ Declining | +2.71 µg/L/yr | 6 |
County Ranking
Ranked #5 of 27 lakes in Washburn County
Nearby Lakes With Higher Grades
Stone Lake holds Grade B. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Washburn County
Frequently asked questions about Stone Lake
Where is Stone Lake?
- Stone Lake is a lake in Washburn County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Stone Lake?
- Stone Lake in Washburn County, Wisconsin has a water quality grade of B (Good). Water clarity: 23 ft visibility. Phosphorus: 11.2 µg/L. Maximum depth: 49 ft. Surface area: 490 acres.
Is Stone Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Stone Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Stone Lake?
- Stone Lake has a maximum depth of 49 feet. The lake covers 490 acres.
What fish are in Stone Lake?
- Fish species found in Stone Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Stone Lake is located in Washburn County, Wisconsin.
What did the DNR fisheries survey find at Stone Lake?
- Wisconsin DNR rates Smallmouth Bass and Walleye as abundant on Stone Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Stone Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Does Stone Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Stone Lake (clouds, ice, or an off-season gap). The most recent reading was high (128,233 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Stone Lake?
- Stone Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Stone Lake, Spring Lake. Public access is listed as yes.
Explore Stone Lake across LakeQuality
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Species activity outlook by water temperature and season
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Where to stay at Wisconsin's top lakes, each with its grade
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Low nutrients, clear water, excellent for swimming
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Where this data comes from
49 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX49 samples · 2020–2025
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