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Green Lake
Enhanced dataInteractive depth contours
Green LakeGreen Lake County, WI
Contours load with map Access
Interactive depth contours10-foot typical interval · Modeled depth estimate · Not a survey · Not for navigation
Source: LakeList depth modelmedium confidence · QA passed · Select a contour to inspect its mapped depthModeled depth estimate: contours computed from the lake's shoreline shape and its documented 236-ft maximum depth (depth grows with distance from shore, calibrated to the documented mean depth where available). This is a smooth mathematical model, not a survey - real holes, bars, and drop-offs will differ. Community sonar (C-MAP Genesis) overlays where recorded. Not for navigation.LakeList assistant
Plan your lake day
Fishing spots, food, lodging, marinas, and rentals around Green Lake.
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Fishing forecast
Best windows for Green Lake
Weather-based planning built from the National Weather Service hourly forecast near this lake.
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Checking wind, precipitation, and near-term weather windows.
Water temperature
Green Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
73°FWarm
Seasonal estimate. Checking current National Weather Service air temperatures…
Comfortable summer pattern. Bass and panfish are active; early and late hours beat the midday heat.
Estimates are modeled, not measured. Actual temperatures vary with depth, wind mixing, and recent weather — verify conditions before swimming, boating, or heading onto ice.
Wisconsin DNR water assessment
Impaired waterbody listed
The DNR lists this waterbody as impaired. This notice is not itself a closure; review the official assessment and current guidance before your trip.
303(d) / impairment recordRecreation restrictions noted
Low DOPollutants: Total Phosphorus, PCBs
- Status
- TMDL Approved, Pollutant Removed
- Public health
- General Advice
- Recreation
- Recreational Restrictions
- Aquatic life
- Not specified
Water is impaired due to one or more pollutants and associated quality impacts.
Review DNR water quality Check consumption advice Source updated 2026-03-25 · LakeList verified 2026-07-12
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Silver Creek Estuary at CTH A (USGS 04073468).
Sampled Apr 2026
High nutrients in the most recent monitored summers.
Based on July–August 2025 averages across 3 volunteer readings.42Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — a typical profile for good swimming lakes.
NutrientsTotal phosphorus — fuels plant & algae growth
181 µg/LJul–Aug 2025 avg (3 readings)
HighHigh phosphorus points to heavy plant/algae growth pressure.
All readings by year · station details · methodology
Summer averages (July/August)
July/August means; counts in parentheses show how many samples went into each average.
| Year | Secchi | Chlorophyll-a | Total phosphorus |
|---|---|---|---|
| 2025 | — | — | 181.0 µg/L (3) |
Latest individual samples: total phosphorus 175 µg/L (2026-04-15).
Secchi clarity is how deep a black-and-white disk stays visible from the surface — more feet means clearer water.
Chlorophyll-a is an algae pigment; higher values signal more algae in the water column.
Total phosphorus is a nutrient that feeds algae and aquatic plants. It is not a weed survey — depth, bottom type, water movement, and management change the actual lake experience.
Silver Creek Estuary at CTH A (USGS 04073468)Station 10059527 · TSI based on chlorophyll
Modeled from DNR/CLMN monitoring — not a safety or swim-condition report. Verify current conditions locally. LakeList verified 2026-07-12.What visitors and local sources report
Lake experiences
Dated, source-linked observations about swimming and other lake activities. These are historical reports, not live conditions or a safety grade.
SwimmingSwimmer's itch
County received swimmer's itch reports
Green Lake County reported several suspected cases around the July 4 holiday and advised swimmers on ways to reduce exposure. The notice is historical, not a statement about today's conditions.
Green Lake County: Swimmer's ItchRead reports in context.
Conditions can change by date and shoreline. A report does not establish a lake-wide or current hazard, and no indexed report does not mean an issue has never occurred. Check current official notices before entering the water.
Official Wisconsin information
Plan with DNR sources
LakeList links to the authoritative record so you can verify maps, rules, and current notices before leaving.
Historical DNR depth maps4 converted map sheetsView DNR depth mapHistorical map · not for navigationFishing regulationsVerify current seasons, limits, and restrictionsOfficial DNR lake pageFacts, advisories, boating, and water qualityWater quality reportsMonitoring stations, clarity, and DNR reportsInvasive speciesVerified, observed, and historical AIS recordsBoating ordinancesLocal slow-no-wake and water-use restrictionsFish consumption advisoriesStatewide and waterbody-specific health guidance
Historical depth maps are not for navigation. Verify regulations and access at the official source before your trip.
Historical Wisconsin DNR maps
Green Lake depth maps
4 converted map sheets. These historical surveys are not for navigation.
Navigable depth map
Green Lake · sheet 1
Pan, zoom, and inspect the converted Wisconsin DNR historical map image in the browser. Historical survey — not for navigation.
Source: Wisconsin DNR · WBIC 146100 · image navigation only; spatial alignment pending · Historical lake maps are not for navigation.
Source: Wisconsin Department of Natural Resources. Converted for browser access with source URLs, checksums, and retrieval dates retained. Historical lake maps are not for navigation.
Wisconsin DNR · 2026–2027 season
Lake-specific fishing regulations
Rule text published by the DNR for this waterbody, cached by WBIC and verified 2026-07-12.
All species
Catch and release fishing for largemouth and smallmouth bass is open year round unless otherwise noted. Motor Trolling is allowed with up to 3 hooks, baits, or lures, per angler.
Catfish
Season Dates: Open All Year. See specific species regulations in this group.
Cisco and whitefish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Lake sturgeon
Season Dates: Closed. No fishing allowed.
Largemouth and smallmouth bass
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 14" and the daily bag limit is 5.
Muskellunge and hybrids
Season Dates: May 2, 2026 to December 31, 2026 on open water. The minimum length limit is 40" and the daily bag limit is 1.
Northern pike
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 26" and the daily bag limit is 2.
Paddlefish
Season Dates: Closed. No fishing allowed.
Panfish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is 10.
Rock, yellow, and white bass
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Rough fish
Season Dates: Open All Year. No minimum length limit and the daily bag limit is unlimited.
Shovelnose sturgeon
Season Dates: Closed. No fishing allowed.
Trout and salmon
See Trout regulations layer.
Urban waters gamefish
This waterbody is not considered an urban water, Urban Waters Gamefish regulations do not apply.
Walleye, sauger, and hybrids
Season Dates: May 2, 2026 to March 7, 2027. The minimum length limit is 15" and the daily bag limit is 3.
Regulations can change. The official DNR page controls; verify seasons, boundaries, bag limits, and emergency rules before fishing.
7,920surface acres
236max depth feet
8public access points
43.8125, -89.0050latitude, longitude
Access
Public access points
Boat launchBeyers Cove Boat Launch43.80558, -89.06772Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchCanal Street Launch43.84799, -88.96266Managed by CITYCITY OF GREEN LAKERamp surface: Concrete PlankADA-accessible feature: NoVerified 2026-07-12
Boat launchDeacon Mills Park Boat Ramp43.84332, -88.96121Managed by CITYCITY OF GREEN LAKERamp surface: OtherADA-accessible feature: NoVerified 2026-07-12
Boat launchDodge Memorial Park Access43.77835, -89.05055Managed by COUNTYTOWN OF BROOKLYNRamp surface: Concrete PanelsVerified 2026-07-12
Boat launchDuerings Landing43.83612, -88.93631Managed by CITYTOWN OF BROOKLYNRamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Boat launchHattie Sherwood Park Boat Launch43.84337, -88.96697Managed by CITYCITY OF GREEN LAKERamp surface: GravelADA-accessible feature: NoVerified 2026-07-12
Boat launchHorners Landing43.81733, -88.95632Managed by COUNTYTOWN OF GREEN LAKERamp surface: ConcreteADA-accessible feature: NoVerified 2026-07-12
Boat launchSunset Park Boat Ramp43.82625, -88.92737Managed by COUNTYTOWN OF BROOKLYNRamp surface: Concrete PanelsADA-accessible feature: YesVerified 2026-07-12
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
CatfishSmallmouth BassTroutLargemouth BassNorthern PikePanfishWalleye
Depth FAQ
How deep is Green Lake?
Green Lake is 236 feet deep at its deepest point and averages about 104 feet, according to Wisconsin DNR records.
Is there a free depth map of Green Lake?
Yes. LakeList publishes a free interactive depth contour map of Green Lake at a typical 10-foot interval, with an optional 3D underwater view, derived from LakeList depth model survey data.
Where does the Green Lake depth map come from?
The interactive depth contours are derived from LakeList depth model. Each contour set passes a visual QA review against the source document before it is published. The depths are a modeled estimate calibrated to the lake's documented maximum depth - not a survey, and not for navigation.
Trust and freshness
Where this lake data comes from
Wisconsin DNR Lake Mapsname, coordinates, county, source identifiers
LakeList record updated 2026-07-12
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