Lake Winneconne
Lake Winneconne in Winnebago County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility. Maximum depth: 9 ft. Surface area: 4553 acres.
Wisconsin DNR rates Panfish, Northern Pike, Sturgeon, and Catfish as abundant on Lake Winneconne. DNR survey details →
- Clarity
- 2.5 ft
- Typical in August
- 74°F
- Max depth
- 9 ft
- Area
- 4,553 acres
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Winnebago County
Swipe left or right on this bar to open the next or previous lake.
Why Lake Winneconne 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 Winneconne, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
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 Winneconne is a 4,553-acre lake in Winnebago County, Wisconsin with a maximum depth of 9 feet. Overall water quality is improving over recent sampling years. The lake supports 8 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-06. Grade methodology: LakeQuality methodology.
Watch Lake Winneconne water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Winneconne
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.5 ft of visibility. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Winneconne
Compare lakeside cabins, hotels, and vacation rentals near Lake Winneconne 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 Winneconne
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 trip? Cabins and lodging at Lake Winneconne → · more Wisconsin lake trips
Water Temperature
Lake Winneconne typically sits around 74°F at the surface in August. Summer average is about 75°F. Usually warmest in Jul (about 77°F) and coldest in Oct (about 52°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 47 field readings (2024–2026) via the EPA Water Quality Portal. See the full Lake Winneconne water temperature breakdown →
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Lake Winneconne — clouds, ice, or an off-season gap in coverage. The most recent reading was high (772,681 cells/mL) on July 18, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Wisconsin DNR rates Panfish, Northern Pike, Sturgeon, and Catfish as abundant on Lake Winneconne.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lake Winneconne — official chemistry is on file, not a letter, and the water-quality trend over 7 years of monitoring is improving. 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. 16 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 9 ft |
| Surface Area | 4,553 acres |
| Public Access | Yes |
Recreation & Access
- Indian Shore RoadPublic
- North First StreetPublic
- Lake Winneconne ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Winneconne
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: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.143 m/yr | 7 |
EPA Impairment Status
Lake Winneconne is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit WI10000776 · Official waterbody report
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Lake Winneconne under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Winneconne Wastewater TreatmenWinneconne · 1.3 mi away · NPDES WI0021938Recent violation
- Cross Farms LlcWinneconne, Town Of · 3.6 mi away · NPDES WI0059226
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Lake Winneconne
Lake Winneconne has no grade, but these lakes within a short drive do.
Nearby Lakes in Winnebago County
Frequently asked questions about Lake Winneconne
Where is Lake Winneconne?
- Lake Winneconne is a lake in Winnebago County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Lake Winneconne?
- Lake Winneconne in Winnebago County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility. Maximum depth: 9 ft. Surface area: 4553 acres.
Is Lake Winneconne safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Winneconne is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Lake Winneconne?
- Lake Winneconne typically sits around 74°F at the surface in August, from 47 EPA Water Quality Portal field readings (2024–2026). That is a typical value for the month, not a live reading.
How deep is Lake Winneconne?
- Lake Winneconne has a maximum depth of 9 feet. The lake covers 4553 acres.
What fish are in Lake Winneconne?
- Fish species found in Lake Winneconne include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye, Sturgeon, Catfish. Lake Winneconne is located in Winnebago County, Wisconsin.
What did the DNR fisheries survey find at Lake Winneconne?
- Wisconsin DNR rates Panfish, Northern Pike, Sturgeon, and Catfish as abundant on Lake Winneconne. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lake Winneconne — official chemistry is on file, not a letter, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Does Lake Winneconne have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Lake Winneconne (clouds, ice, or an off-season gap). The most recent reading was high (772,681 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Lake Winneconne?
- Lake Winneconne has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Indian Shore Road, North First Street, Lake Winneconne Park. Public access is listed as yes.
Explore Lake Winneconne across LakeQuality
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Winnebago County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Wolf River Watershed, ranked by water quality
Lakes in the Lower Fox-Wolf (Lake Winnebago Pool), ranked by water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
State Parks Near Lake Winneconne
Other Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Where this data comes from
60 measurements from 2 monitoring stations, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX60 samples · 2020–2026
Monitoring station identifiers (2)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
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