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Lake Wisconsin
Enhanced dataInteractive depth contours
Lake WisconsinColumbia County, WI
Contours load with map Access
Interactive depth contours5-foot typical interval · Sonar-derived depth (C-MAP Genesis) · Gaps interpolated · Not for navigation
Source: C-MAP Genesis community sonar (derived)high confidence · QA passed · Select a contour to inspect its mapped depthDepths decoded from C-MAP Genesis Social Map community sonar recordings (used with permission), covering 62% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 24-ft maximum depth. More accurate than a pure model, but still an estimate. Not for navigation.LakeList assistant
Plan your lake day
Fishing spots, food, lodging, marinas, and rentals around Lake Wisconsin.
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Fishing forecast
Best windows for Lake Wisconsin
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
Lake Wisconsin water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
76°FPeak summer
Seasonal estimate. Checking current National Weather Service air temperatures…
Warmest water of the year. Fish hold deeper or feed in low light; swimming and watersports are at their best.
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
Public-health advice and impairment listed
The DNR assessment indicates specific public-health advice for this waterbody. Review current official guidance before your trip or eating your catch.
303(d) / impairment recordSpecific public-health adviceRecreation restrictions noted
Mercury Contaminated Fish Tissue, Low DO, Recreational Restrictions - Blue Green Algae, PCBs Contaminated Fish Tissue, EutrophicationPollutants: Mercury, Total Phosphorus, PCBs
- Status
- TMDL Approved, 303d Listed
- Public health
- Specific 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 Lake Wisconsin Columbia Co. - Turtle Bay.
Sampled May 2026Volunteer monitoring since 1993
Murky water — summer clarity of 2.2 ft ranks among the lowest of monitored Wisconsin lakes.
Based on July–August 2025 averages across 3 volunteer readings.70Eutrophic5-yr summer TSI
Nutrient-rich, greener water — more algae and plant growth, common in shallower lakes.
Water claritySecchi disk depth
2.2 ftJul–Aug 2025 avg (3 readings)
MurkyStable since 2018
Clearer than 14% of 596 monitored Wisconsin lakes with current readings.
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 | 2.2 ft (3) | — | — |
| 2024 | 2.3 ft (4) | — | — |
| 2023 | 1.8 ft (3) | — | — |
| 2022 | 2.2 ft (1) | — | — |
| 2021 | 2.4 ft (1) | — | — |
| 2020 | 2.2 ft (2) | — | — |
| 2019 | 2.0 ft (2) | — | — |
| 2018 | 2.0 ft (1) | — | — |
| 2017 | 1.9 ft (4) | — | — |
Latest individual samples: Secchi 4 ft (2026-05-26).
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.
Lake Wisconsin Columbia Co. - Turtle BayStation 10007595 · 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.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 sheetsFishing 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
Lake Wisconsin depth maps
4 converted map sheets. These historical surveys are not for navigation.
Navigable depth map
Lake Wisconsin · 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 1260600 · 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 fisheries survey
Fish population survey
Structured LakeList extraction from the 2025 DNR fisheries survey. Population estimates, density, and catch-rate indices use different units, methods, and scopes, so each value is presented in its original form rather than normalized against a different measure.
Survey indicatorsValues keep their source unit and method; unlike measures are not scaled or compared.
Management contextOnly observations from the six Lake Wisconsin fall-electrofishing stations are promoted as metrics. Separate Kilbourn Dam tailwater observations and comparison-waterbody values in the same report are excluded.
The 2025 fall electrofishing assessment sampled 14.3 miles at six Lake Wisconsin stations to evaluate walleye and sauger recruitment and monitor other gamefish. Lake-specific catches included 253 walleye and 467 sauger; young-of-year catch rates were below their long-term medians but improved from 2024. Smallmouth bass abundance ranked in the upper quartile of the Lake Wisconsin fall-survey series.
- The report recommends conducting the fall survey one to two weeks later in October to improve temperature and visibility conditions.
- The 2025 Lake Wisconsin young-of-year walleye and sauger catch rates were below their 1993-2025 medians but increased from the record-low or low 2024 values.
- Spring surveys or summer hoop netting remain the preferred assessment methods for northern pike, muskellunge and catfish; their fall catches should be interpreted cautiously.
Flathead catfish
0.3 fish/mile2025 Lake Wisconsin fall CPUE · p. 5
Largemouth bass
8.4 fish/mile2025 Lake Wisconsin fall CPUE · p. 5
Muskellunge
0.1 fish/mile2025 Lake Wisconsin fall CPUE · p. 5
Northern pike
0.6 fish/mile2025 Lake Wisconsin fall CPUE · p. 5
Sauger
467 fish2025 Lake Wisconsin fall catch · p. 432.7 fish/mile2025 Lake Wisconsin fall CPUE · p. 410.6 inches2025 Lake Wisconsin average length · p. 4138 fish2025 young-of-year catch · p. 4
Smallmouth bass
13.1 fish/mile2025 Lake Wisconsin fall CPUE · p. 41.6 fish/mile2025 CPUE over 14 inches · p. 40.6 fish/mile2025 CPUE over 17 inches · p. 4
Walleye
253 fish2025 Lake Wisconsin fall catch · p. 417.7 fish/mile2025 Lake Wisconsin fall CPUE · p. 49.9 inches2025 Lake Wisconsin average length · p. 4183 fish2025 young-of-year catch · p. 4
2025 Lake Wisconsin and Wisconsin River Fall Walleye and Sauger Recruitment AssessmentMatched by exact wbic and name county · WBICs 1260600 · verified 2026-07-18Wisconsin DNR fisheries survey report; LakeList operator documented permission to leverage this report with source attribution.
7,197surface acres
24max depth feet
15public access points
43.3571, -89.6374latitude, longitude
Access
Public access points
Boat launchAccess - Corning Street-Town of Dekorra43.38695, -89.54532Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Lake Drive off Highway 18843.35717, -89.65452Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Moon Valley Landing43.37225, -89.66946Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Okee Landing43.35779, -89.58243Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Pine Bluff on Bay Drive43.36732, -89.56857Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Pleasantview Road off Highway 18843.35888, -89.63158Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Red Cedar Road-Town Of Lodi43.35401, -89.56286Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Summer Oaks Resort off Highway 7843.35064, -89.69206Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Sunset Bay off Highway 18843.35210, -89.63139Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess -- Whalen Grade43.39163, -89.52196Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess - Willow Road-Town of Dekorra - Google MapLake Wisconsin -- Access - Palisade Street-Village of Merrimac43.37189, -89.62891Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchCamp Perry Park Carry-in43.38783, -89.54375Managed by TOWNSHIPTOWN OF DEKORRARamp surface: DirtLanding type: CARRY-INADA-accessible feature: NoVerified 2026-07-12
Boat launchEagle Drive Boat Launch43.36844, -89.54200Managed by TOWNSHIPTOWN OF LODIRamp surface: Concrete PanelsADA-accessible feature: NoVerified 2026-07-12
Boat launchLake Wisconsin Access - Linda Circle43.37411, -89.55269Managed by TOWNSHIPTOWN OF LODIRamp surface: PavedADA-accessible feature: NoVerified 2026-07-12
Boat launchLinda Circle Access - Google MapLake Wisconsin -- Access - Middle Channel-Harmony Grove43.37116, -89.54779Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
No nearby trip-planning places yet
Fishery
Notable species
Largemouth BassNorthern PikeSmallmouth BassWalleyeCatfishPanfishTrout
Depth FAQ
How deep is Lake Wisconsin?
Lake Wisconsin is 24 feet deep at its deepest point, according to Wisconsin DNR records.
Is there a free depth map of Lake Wisconsin?
Yes. LakeList publishes a free interactive depth contour map of Lake Wisconsin at a typical 5-foot interval, with an optional 3D underwater view, derived from C-MAP Genesis community sonar (derived) survey data.
Where does the Lake Wisconsin depth map come from?
The interactive depth contours are derived from C-MAP Genesis community sonar (derived). Each contour set passes a visual QA review against the source document before it is published. The depths are derived from community sonar recordings (C-MAP Genesis Social Map, used with permission), with gaps between recordings interpolated; not for navigation.
Trust and freshness
Where this lake data comes from
Wisconsin DNR Lake Pagesname, coordinates, county, source identifiers
LakeList record updated 2026-07-12
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