Lake Winnebago
Lake Winnebago in Winnebago County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 131995 acres.
- Area
- 131,995 acres
- Public access
- Yes
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Why Lake Winnebago has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Winnebago, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Winnebago is a 131,995-acre lake in Winnebago County, Wisconsin. 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, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Winnebago water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Winnebago
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay 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
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
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).
- 2025Lake Winnebago bottom trawling assessment report, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2025Winnebago System chironomid assessment report, 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2025Winnebago System sturgeon spawning and population assessment report 2025Fisheries Survey · WI DNR · 2025 (PDF)
- 2023Winnebago System lake sturgeon acoustic telemetry report 2023Fisheries Survey · WI DNR · 2023 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 131,995 acres |
| Public Access | Yes |
No bathymetric survey has been published for Lake Winnebago, so its depth is not documented here.
Recreation & 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
Fishing Lake Winnebago
Nearby Lakes in Winnebago County
Frequently asked questions about Lake Winnebago
Where is Lake Winnebago?
- Lake Winnebago is a lake in Winnebago County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Winnebago?
- Lake Winnebago in Winnebago County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 131995 acres.
Is Lake Winnebago safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Winnebago is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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.
Explore Lake Winnebago across LakeQuality
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Where this data comes from
Measurements for Lake Winnebago come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory