2012
Northern PikeMud Lake - Madison Chain Of Lakes · Large Fingerling
2507.7 in average
LakeList
FavoritesStateWisconsin
Big Dummy Lake
Enhanced dataInteractive depth contours
Big Dummy LakeBarron 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 98% of the lake. Small gaps between recordings are smoothly connected; larger unrecorded areas follow the lake's depth model calibrated to the DNR-documented 54-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 Dummy Lake.
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Fishing
Fishing at Big Dummy Lake
Fishery
Notable species
Largemouth BassNorthern PikePanfishWalleye
Angler reports · Fishbrain
What anglers catch here
Anglers have logged 18 catches on Big Dummy Lake via Fishbrain — 1 in the last 30 days, most recently on Jul 5, 2026.
Most-reported species
- Largemouth bass
- Northern pike
2 of the 18 logged catches didn’t name a species and aren’t listed above.
Counts reflect reporting activity, not fish populations. Waterbody location is provider-level; exact spots and angler details aren’t shown.
Fishery details for this lakeExplore this area on FishbrainWisconsin DNR stocking
Fish stocking history
The latest published year is 2012, when 250 fish were recorded across 1 entry.
2010
Northern PikeUnspecified · Large Fingerling
3338.6 in average
NWS weather
Weather windows
Weather-based planning from the National Weather Service hourly forecast near this lake — not a catch forecast.
Loading latest forecast…
Checking wind, precipitation, and near-term weather windows.
Water temperature
Big Dummy Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
69°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 record
NAPollutants: Total Phosphorus
- Status
- Delist
- Public health
- General Advice
- Recreation
- Full Body Contact
- Aquatic life
- Not specified
Proposed for removal from impaired waters during assessment period.
Review DNR water quality Check consumption advice Source updated 2026-03-12 · LakeList verified 2026-07-12
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Big Dummy Lake - Deep Hole.
Sampled Aug 2025Volunteer monitoring since 1988
Clear, low-algae water — summer clarity of 12 ft is clearer than most monitored Wisconsin lakes.
Based on July–August volunteer averages from 2023–2025; each value shows its own year.44Mesotrophic5-yr summer TSI
Moderately clear with moderate nutrients — some algae and plant growth through the season.
Water claritySecchi disk depth
12 ftJul–Aug 2023 avg (2 readings)
ClearStable since 2017
Clearer than 68% of 593 monitored Wisconsin lakes with current readings.
AlgaeChlorophyll-a
3 µg/LJul–Aug 2025 avg (2 readings)
LowImproving — down ~19% vs earlier years
NutrientsTotal phosphorus — fuels plant & algae growth
19 µg/LLatest single sample · 2025-06-29
LowLow 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 | 11.0 ft (1) | 3.0 µg/L (2) | — |
| 2024 | 12.0 ft (1) | 5.5 µg/L (2) | 15.0 µg/L (1) |
| 2023 | 12.0 ft (2) | 4.0 µg/L (2) | — |
| 2022 | 12.0 ft (1) | 5.0 µg/L (2) | — |
| 2021 | 10.9 ft (2) | 2.5 µg/L (2) | — |
| 2019 | 8.5 ft (2) | 8.0 µg/L (2) | 22.0 µg/L (1) |
| 2018 | 9.0 ft (2) | 2.5 µg/L (2) | — |
| 2017 | 11.0 ft (2) | 3.5 µg/L (2) | — |
| 2016 | 9.0 ft (2) | 3.5 µg/L (2) | — |
| 2015 | 8.5 ft (2) | 5.0 µg/L (2) | — |
Latest individual samples: Secchi 11 ft (2025-07-27), chlorophyll-a 3 µg/L (2025-08-27), and total phosphorus 19 µg/L (2025-06-29).
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 Dummy Lake - Deep HoleStation 033171 · 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 Dummy Lake depth maps
1 converted map sheet. These historical surveys are not for navigation.
Navigable depth map
Big Dummy 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 1835100 · 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.
114surface acres
54max depth feet
1public access points
45.5721, -91.9837latitude, longitude
Access
Public access points
Boat launchAccess45.57583, -91.97977Managed by Wisconsin DNR
DNR verifiedDirections
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Trip-planning places
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Depth FAQ
How deep is Big Dummy Lake?
Big Dummy Lake is 54 feet deep at its deepest point and averages about 12 feet, according to Wisconsin DNR records.
Is there a free depth map of Big Dummy Lake?
Yes. LakeList publishes a free interactive depth contour map of Big Dummy 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 Dummy 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 2026-05-25
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