Halsey Lake
Florence County, Wisconsin506 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Halsey Lake. Here is what has been measured.
- Mesotrophic
- 10 ft max depth
- Public access
- Limited data
Halsey Lake in Florence County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 6.5 ft visibility. Phosphorus: 18 µg/L. Maximum depth: 10 ft. Surface area: 506 acres.
Wisconsin DNR lists Largemouth Bass as common on Halsey Lake. DNR survey details →
Halsey Lake is a 506-acre mesotrophic lake in Florence County, Wisconsin with a maximum depth of 10 feet. 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. Methodology: how these readings are compared.
Halsey Lake covers about 510 acres in Florence County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Halsey Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Halsey Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing4 species recorded
Swimming conditions
Readings onlyLimited data
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 Halsey 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 Halsey Lake
These are the measurements Wisconsin DNR publishes for Halsey Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.5 ft. Phosphorus 18 µg/L. TSI 48.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 18µg/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. | 48 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Halsey Lake
Answers come straight from the public measurements and survey records on this page.
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 ↗
Wisconsin DNR lists Largemouth Bass as common on Halsey Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Halsey Lake’s water-quality measurements separately, and the water-quality trend over 4 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 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)
Lake Details
Max depth
10 ft
Surface area
506 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Shoreline
3.7 mi
HydroLAKES / HydroSHEDS
Elevation
1,496 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Halsey 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 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.
Top-rated places to stay near Halsey Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Follow Halsey Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Halsey Lake
Water Quality Trend: Worsening
Based on 4 years of monitoring (2020–2026).
Water clarity
Worsening4 years
Nearby Lakes in Florence County
Frequently asked questions about Halsey Lake
Where is Halsey Lake?
- Halsey Lake is a lake in Florence County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Halsey Lake?
- Halsey Lake in Florence County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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.
What did the DNR fisheries survey find at Halsey Lake?
- Wisconsin DNR lists Largemouth Bass as common on Halsey Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Halsey Lake’s water-quality measurements separately, and the water-quality trend over 4 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
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.
Can I fish at Halsey Lake?
- Halsey 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 Halsey Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Fish species and the cleanest 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 readings
Wisconsin's cleanest lakes, ranked on agency measurements
More lakes in Wisconsin
Other 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)
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
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