Poskin Lake
Barron County, Wisconsin154 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Poskin Lake. Here is what has been measured.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- Curly-Leaf Pondweed
- 30 ft max depth
- Public access
Poskin Lake in Barron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 4 ft visibility. Phosphorus: 29.3 µg/L. Maximum depth: 30 ft. Surface area: 154 acres.
Wisconsin DNR lists Largemouth Bass as common on Poskin Lake. DNR survey details →
Poskin Lake is a 154-acre productive, nutrient-rich eutrophic lake in Barron County, Wisconsin with a maximum depth of 30 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 27 other monitored lakes in Barron County, Poskin Lake ranks #21 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-14. Methodology: how these readings are compared.
Poskin Lake covers about 150 acres in Barron County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Poskin Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Poskin Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing4 species recorded
- Deep water30 ft surveyed max depth
Swimming conditions
Readings onlyRecreation use not supported
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. Poskin Lake is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Poskin 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 Poskin Lake
These are the measurements Wisconsin DNR publishes for Poskin 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 4 ft. Phosphorus 29.3 µg/L. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 29.3µg/L | Fair 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. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Poskin Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Poskin Lake typically sits around 71°F at the surface in September. Summer average is about 73°F. Usually warmest in Jul (about 77°F) and coldest in Jun (about 69°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (69°F) to its warmest (77°F).
Typical surface water temperature by month, from 18 field readings (2024–2025) via the EPA Water Quality Portal. See the full Poskin Lake water temperature breakdown →
Wisconsin DNR lists Largemouth Bass as common on Poskin Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Poskin Lake’s water-quality measurements separately, and the water-quality trend over 7 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 1999. 3 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Poskin 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).
- 2024Poskin Lake fishery survey, 2024Fisheries Survey · WI DNR · 2024 (PDF)
Lake Details
Max depth
30 ft
Surface area
154 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
60 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.9 mi
HydroLAKES / HydroSHEDS
Elevation
1,142 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Poskin 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 Poskin Lake
Compare lakeside cabins, hotels, and vacation rentals near Poskin Lake in Barron 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 Poskin Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Follow Poskin Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Poskin 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: Worsening
Based on 7 years of monitoring (2020–2026).
Water clarity
Worsening4 years
Phosphorus
Worsening+1.81 µg/L/yr7 years
EPA Impairment Status
Poskin Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
Source: EPA ATTAINS assessment unit WI10004479 · Official waterbody report
Nearby Lakes in Barron County
Frequently asked questions about Poskin Lake
Where is Poskin Lake?
- Poskin Lake is a lake in Barron County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Poskin Lake?
- Poskin Lake in Barron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 4 ft visibility. Phosphorus: 29.3 µg/L. Maximum depth: 30 ft. Surface area: 154 acres.
Is Poskin Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Poskin Lake is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Poskin Lake?
- Poskin Lake typically sits around 71°F at the surface in September, from 18 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Poskin Lake?
- Poskin Lake has a maximum depth of 30 feet. The lake covers 154 acres.
What fish are in Poskin Lake?
- Fish species found in Poskin Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Poskin Lake is located in Barron County, Wisconsin.
What did the DNR fisheries survey find at Poskin Lake?
- Wisconsin DNR lists Largemouth Bass as common on Poskin Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Poskin Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Poskin Lake?
- Poskin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Poskin Lake. Public access is listed as yes.
Can I fish at Poskin Lake?
- Poskin 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 Poskin Lake across LakeQuality
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Where this data comes from
42 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_WQX42 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
Impairment status from EPA ATTAINS 303(d) database
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