Halsey Lake
Halsey Lake in Florence County, Wisconsin has a water quality grade of B (Good). Water clarity: 6.5 ft visibility. Phosphorus: 18 µg/L. Maximum depth: 10 ft. Surface area: 506 acres.
- Clarity
- 6.5 ft
- Max depth
- 10 ft
- Area
- 506 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Florence County
Halsey Lake is a 506-acre mesotrophic lake in Florence County, Wisconsin with a maximum depth of 10 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. 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 11 other monitored lakes in Florence County, Halsey Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-07. Grade methodology: LakeGrade methodology.
Watch Halsey Lake water quality
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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)
Murky, only visible to about 6.5 ft. Phosphorus level: 18 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.5 ft | Not graded |
| Phosphorus | 18 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Halsey Lake
Compare lakeside cabins, hotels, and vacation rentals near Halsey Lake in Florence 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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Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Halsey Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was high (328,095 cells/mL) on July 18, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10 ft |
| Surface Area | 506 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Halsey LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Halsey Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1995. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Halsey 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).
- 2024Halsey Lake comprehensive survey, 2024Comprehensive Survey · WI DNR · 2024 (PDF)
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.256 m/yr | 4 |
County Ranking
Ranked #2 of 12 lakes in Florence County
Nearby Lakes in Florence County
Frequently asked questions about Halsey Lake
What is the water quality grade for Halsey Lake?
- Halsey Lake in Florence County, Wisconsin has a water quality grade of B (Good). Water clarity: 6.5 ft visibility. Phosphorus: 18 µg/L. Maximum depth: 10 ft. Surface area: 506 acres.
Is Halsey Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Halsey Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Halsey Lake?
- Halsey Lake has a maximum depth of 10 feet. The lake covers 506 acres.
What fish are in Halsey Lake?
- Fish species found in Halsey Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Halsey Lake is located in Florence County, Wisconsin.
Does Halsey Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Halsey Lake (clouds, ice, or an off-season gap). The most recent reading was high (328,095 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Halsey Lake?
- Halsey Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Halsey Lake. Public access is listed as yes.
Explore Halsey Lake across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Florence 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
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
18 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_WQX18 samples · 2020–2026
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