Where is Lake Winnebago?

Lake Winnebago is a lake in Winnebago County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.

How deep is Lake Winnebago?

Lake Winnebago has a maximum depth of 21 feet. The lake covers 131995 acres.

Are there boat ramps on Lake Winnebago?

Lake Winnebago has 7 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Ecker Lakeland Road, Nagy Park / Black Wolf, 24th Avenue, Stockbridge Harbor, among others. Public access is listed as yes.

Can I fish at Lake Winnebago?

Lake Winnebago has 7 documented boat landings 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.

Lake Winnebago

Winnebago County, Wisconsin131,995 acresView map Directions

No nutrient or algae sampling on record from Wisconsin DNR for this lake.

Max depth

21 ft

Bathymetric survey

Area

131,995 acres

Surface area

Shoreline

107.9 mi

Measured length

Impaired · Nutrients (phosphorus, nitrogen)
21 ft max depth
Public access

See the measurements Directions Where to stay

Lake Winnebago in Winnebago County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 21 ft. Surface area: 131995 acres.

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Lake Winnebago is a 131,995-acre lake in Winnebago County, Wisconsin with a maximum depth of 21 feet. Limited fish-species data available. Public access is available with 7 public boat landings.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water. Methodology: how these readings are compared.

What Lake Winnebago is good for

From access and monitoring records, not editorial picks.

Boat launch7 documented ramps
Big water131,995 acres

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Lake Winnebago is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), turbidity. Check local advisories before you swim.

Whether Lake Winnebago 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.

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Water quality measurements for Lake Winnebago

These are the measurements Wisconsin DNR publishes for Lake Winnebago, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Lake Winnebago

Answers come straight from the public measurements and survey records on this page.

→ Lake Winnebago water level: the live USGS gauge reading

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Lake Winnebago covering fish populations, stocking, water quality, and management. 4 reports on file.

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

2025
Lake Winnebago bottom trawling assessment report, 2025
Fisheries Survey · WI DNR · 2025 (PDF)
2025
Winnebago System chironomid assessment report, 2025
Fisheries Survey · WI DNR · 2025 (PDF)
2025
Winnebago System sturgeon spawning and population assessment report 2025
Fisheries Survey · WI DNR · 2025 (PDF)
2023
Winnebago System lake sturgeon acoustic telemetry report 2023
Fisheries Survey · WI DNR · 2023 (PDF)

Lake Details

Max depth

21 ft

Surface area

131,995 acres

Shoreline

107.9 mi

Public access

Yes

Listed by Wisconsin DNR

Recreation & Access

Boat Landings

Yes

Public Access

Ecker Lakeland RoadPublic
Nagy Park / Black WolfPublic
24th AvenuePublic
Stockbridge HarborPublic
Brothertown HarborPublic
Fugleburg ParkPublic

Showing 6 of 7 documented landings from the USGS National Boat Ramps inventory.

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Lake Winnebago

Compare lakeside cabins, hotels, and vacation rentals near Lake Winnebago in Winnebago 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 Lake Winnebago

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow Lake Winnebago’s readings

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Fishing Lake Winnebago

→ Lake Winnebago fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Lake Winnebago is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)Turbidity

Designated uses not supporting: Aquatic life, Recreation.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit WI10026871 · Official waterbody report

Nearby Lakes in Winnebago County

Lake Butte des Morts2.3 ft clear9.4 miView →Little Lake Butte des Morts2 ft clear · Hypereutrophic14.9 miView →Lake Winneconne2.5 ft clear17.2 miView →Rush Lake3.2 ft clear · Eutrophic19.7 miView →Lake Poygan2.5 ft clear—View →

Frequently asked questions about Lake Winnebago

Where is Lake Winnebago?: Lake Winnebago is a lake in Winnebago County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Lake Winnebago?: Lake Winnebago in Winnebago County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 21 ft. Surface area: 131995 acres.
Is Lake Winnebago safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Winnebago is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), turbidity. Check local advisories before you swim.
How deep is Lake Winnebago?: Lake Winnebago has a maximum depth of 21 feet. The lake covers 131995 acres.
Are there boat ramps on Lake Winnebago?: Lake Winnebago has 7 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Ecker Lakeland Road, Nagy Park / Black Wolf, 24th Avenue, Stockbridge Harbor, among others. Public access is listed as yes.
Can I fish at Lake Winnebago?: Lake Winnebago has 7 documented boat landings 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.