Poskin Lake
Poskin Lake in Barron County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4 ft visibility. Phosphorus: 29.3 µg/L. Maximum depth: 30 ft. Surface area: 154 acres.
- Clarity
- 4 ft
- Typical in August
- 72°F
- Max depth
- 30 ft
- Area
- 154 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Barron County
Poskin Lake is a 154-acre productive, nutrient-rich eutrophic lake in Barron County, Wisconsin with a maximum depth of 30 feet. Water quality is graded C 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 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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Murky, only visible to about 4 ft. Phosphorus level: 29.3 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | Not graded |
| Phosphorus | 29.3 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay 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
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Water Temperature
Poskin Lake typically sits around 72°F at the surface in August. 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.
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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 154 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Poskin LakePublic
Fish Species
Click a species to see every graded 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.
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)
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.488 m/yr | 4 |
| Phosphorus | ↓ Declining | +1.81 µg/L/yr | 7 |
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
Source: EPA ATTAINS assessment unit WI10004479 · Official waterbody report
County Ranking
Ranked #21 of 28 lakes in Barron County
Nearby Lakes With Higher Grades
Poskin Lake holds Grade C. 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 Barron County
Frequently asked questions about Poskin Lake
What is the water quality grade for Poskin Lake?
- Poskin Lake in Barron County, Wisconsin has a water quality grade of C (Fair). 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?
- Generally safe for swimming, moderate water quality. Poskin Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Poskin Lake?
- Poskin Lake typically sits around 72°F at the surface in August, 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.
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.
Explore Poskin Lake across LakeGrade
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High nutrients, frequent algae, reduced clarity
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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)
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
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