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Big Bass Lake
Enhanced dataInteractive depth contours
Big Bass LakeMarathon 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 42% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 13-ft maximum depth. More accurate than a pure model, but still an estimate. Not for navigation.LakeList assistant
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Fishing spots, food, lodging, marinas, and rentals around Big Bass Lake.
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Fishing forecast
Best windows for Big Bass 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
Big Bass Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
77°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.
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Big Bass Lake - Deep Hole.
Sampled Sep 2025Volunteer monitoring since 1994
Somewhat hazy water — summer clarity of 9.3 ft sits near the middle of monitored Wisconsin lakes.
Based on July–August volunteer averages from 2022–2025; each value shows its own year.45Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — a typical profile for good swimming lakes.
Water claritySecchi disk depth
9.3 ftJul–Aug 2025 avg (3 readings)
Slight hazeImproving — up ~46% vs earlier years
Clearer than 52% of 596 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
14 µg/LJul–Aug 2025 avg (2 readings)
ElevatedStable since 2018
NutrientsTotal phosphorus — fuels plant & algae growth
18 µg/LJul–Aug 2022 avg (2 readings)
Low2016–2022
Low phosphorus means light 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 | 9.3 ft (3) | 14.0 µg/L (2) | — |
| 2024 | 7.3 ft (2) | 2.0 µg/L (1) | — |
| 2023 | 7.1 ft (4) | 5.5 µg/L (2) | — |
| 2022 | 6.4 ft (5) | 5.0 µg/L (4) | 18.0 µg/L (2) |
| 2021 | 5.0 ft (4) | 6.5 µg/L (4) | 20.0 µg/L (1) |
| 2020 | 4.8 ft (3) | 8.5 µg/L (2) | — |
| 2019 | 6.7 ft (3) | 6.0 µg/L (1) | — |
| 2018 | 4.7 ft (5) | 5.5 µg/L (2) | 19.0 µg/L (1) |
| 2017 | 6.8 ft (4) | 2.5 µg/L (2) | — |
| 2016 | 8.3 ft (3) | 1.0 µg/L (2) | 20.0 µg/L (1) |
Latest individual samples: Secchi 9 ft (2025-09-11), chlorophyll-a 2 µg/L (2025-09-11), and total phosphorus 15 µg/L (2024-04-14).
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.
Big Bass Lake - Deep HoleStation 373416 · 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 maps1 converted map sheetFishing 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
Big Bass Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Big Bass 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 1405200 · 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.
177surface acres
13max depth feet
1public access points
44.7230, -89.4330latitude, longitude
Access
Public access points
Boat launchAccess44.71792, -89.43666Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
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Fishery
Notable species
PanfishLargemouth BassNorthern Pike
Depth FAQ
How deep is Big Bass Lake?
Big Bass Lake is 13 feet deep at its deepest point and averages about 5 feet, according to Wisconsin DNR records.
Is there a free depth map of Big Bass Lake?
Yes. LakeList publishes a free interactive depth contour map of Big Bass Lake 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 Big Bass Lake 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