Largon Lake
Polk County, Wisconsin135 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Largon Lake. Here is what has been measured.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- Curly-Leaf Pondweed
- 10 ft max depth
- Public access
Largon Lake in Polk County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 55.8 µg/L. Maximum depth: 10 ft. Surface area: 135 acres.
Wisconsin DNR lists Panfish as common on Largon Lake. DNR survey details →
Largon Lake is a 135-acre productive, nutrient-rich eutrophic lake in Polk County, Wisconsin with a maximum depth of 10 feet. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 54 other monitored lakes in Polk County, Largon Lake ranks #48 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-10-20. Methodology: how these readings are compared.
Largon Lake covers about 140 acres in Polk County. It has one public boat landing. For a place on the water, look through cabin and lake-house rentals near Largon Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Largon Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing3 species recorded
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. Largon Lake is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Largon 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 Largon Lake
These are the measurements Wisconsin DNR publishes for Largon Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.5 ft of visibility. Phosphorus 55.8 µg/L. TSI 63.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 55.8µg/L | Poor 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. | 63 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Largon Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on Largon Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Largon Lake’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is stable. 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. 3 stations on file (most recent sample 2022).
Fish Species (DNR-rated)
Lake Details
Max depth
10 ft
Surface area
135 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.2 mi
HydroLAKES / HydroSHEDS
Elevation
1,227 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Largon 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 Largon Lake
Compare lakeside cabins, hotels, and vacation rentals near Largon Lake in Polk 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Largon Lake are listed below.
Top-rated places to stay near Largon Lake
Prices for Oct 16–18, 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 Largon Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Largon 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 readings over time
2 seasons of samples on record (2021–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Stable2 years
Phosphorus
Stable-0.7 µg/L/yr2 years
EPA Impairment Status
Largon 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 WI10005220 · Official waterbody report
Nearby Lakes in Polk County
Frequently asked questions about Largon Lake
Where is Largon Lake?
- Largon Lake is a lake in Polk County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Largon Lake?
- Largon Lake in Polk County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 55.8 µg/L. Maximum depth: 10 ft. Surface area: 135 acres.
Is Largon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Largon Lake is listed impaired under Clean Water Act §303(d) (IR 5R) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Largon Lake?
- Largon Lake has a maximum depth of 10 feet. The lake covers 135 acres.
What fish are in Largon Lake?
- Fish species found in Largon Lake include Panfish, Largemouth Bass, Northern Pike. Largon Lake is located in Polk County, Wisconsin.
What did the DNR fisheries survey find at Largon Lake?
- Wisconsin DNR lists Panfish as common on Largon Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Largon Lake’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Largon Lake?
- Largon Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Largon Lake. Public access is listed as yes.
Can I fish at Largon Lake?
- Largon 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 Largon Lake across LakeQuality
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Where this data comes from
53 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX53 samples · 2021–2022
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