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Big Eau Pleine Reservoir
Enhanced dataHistorical depth chart
Big Eau Pleine ReservoirMarathon County, WI
Historical source depth chart available8 converted source DNR map sheets can be panned and zoomed in the browser. Interactive contours stay hidden until visual QA passes. Historical survey — not for navigation.
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Fishing spots, food, lodging, marinas, and rentals around Big Eau Pleine Reservoir.
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Fishing
Fishing at Big Eau Pleine Reservoir
Fishery
Notable species
WalleyeNorthern PikeMuskySmallmouth Bass
NWS weather
Weather windows
Weather-based planning from the National Weather Service hourly forecast near this lake — not a catch forecast.
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Checking wind, precipitation, and near-term weather windows.
Water temperature
Big Eau Pleine Reservoir 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.
DNR water check
Water quality quick take
From Wisconsin DNR / Citizen Lake Monitoring readings at Big Eau Pleine Lake - Deep Hole.
Sampled Jul 2026Volunteer monitoring since 2006
Murky water — summer clarity of 1.3 ft ranks among the lowest of monitored Wisconsin lakes.
Based on July–August 2025 averages across 8 volunteer readings.74Hypereutrophic5-yr summer TSI
Very nutrient-rich water — heavy algae and plant growth pressure.
Water claritySecchi disk depth
1.3 ftJul–Aug 2025 avg (8 readings)
MurkyImproving — up ~22% vs earlier years
Clearer than 1% of 591 monitored Wisconsin lakes with current readings.
No recent algae readings — last measured 1992. No recent nutrient readings — last measured 1992.
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 |
|---|---|---|---|
| 2026 | 1.0 ft (1) | — | — |
| 2025 | 1.3 ft (8) | — | — |
| 2024 | 1.5 ft (6) | — | — |
| 2023 | 1.3 ft (4) | — | — |
| 2022 | 0.8 ft (1) | — | — |
| 2020 | 1.1 ft (7) | — | — |
| 2019 | 1.4 ft (8) | — | — |
| 2018 | 0.9 ft (7) | — | — |
| 2006 | 3.1 ft (4) | — | — |
| 1992 | 1.6 ft (2) | 28.7 µg/L (3) | 125.0 µg/L (3) |
Latest individual samples: Secchi 1 ft (2026-07-04), chlorophyll-a 28 µg/L (1992-10-05), and total phosphorus 158 µg/L (1992-10-05).
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 Eau Pleine Lake - Deep HoleStation 373123 · TSI based on Secchi
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 maps8 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
Big Eau Pleine Reservoir depth maps
8 converted map sheets. These historical surveys are not for navigation.
Navigable depth map
Big Eau Pleine Reservoir · 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 1427400 · 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.
6,348surface acres
46max depth feet
12public access points
44.7507, -89.8743latitude, longitude
Access
Public access points
Boat launchAccess at Austin Ln And Oxbo Rd44.76588, -89.94647Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at End Of Rd To South Off Big Eau Pleine Park Road44.73559, -89.83521Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at Near County Hwy O44.72523, -89.78737Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at Near Eau Pleine Park Rd44.74049, -89.85190Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at Near Fisherman Cv Off Cth S44.75280, -89.89361Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at Near Maryel Dr And Ruth Dr44.77931, -89.98209Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at Near Sandy Shore Rd44.73510, -89.78952Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at Paradise Dr Nr Cth C44.73802, -89.86927Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess at South Of Big Eau Pleine Park Rd44.73699, -89.83340Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchAccess Off Eau Pleine Park Rd44.76195, -89.86987Managed by Wisconsin DNR
DNR verifiedDirections
Boat launchGeorge's Landing44.73519, -89.85933Managed by STATE(DNR)TOWN OF GREEN VALLEYRamp surface: Concrete PlankADA-accessible feature: NoNorth of Hwy. C on Mead Wildlife AreaVerified 2026-07-12
Boat launchLisa's Landing44.74687, -89.89889Managed by OTHERTOWN OF GREEN VALLEYRamp surface: PavedADA-accessible feature: YesVerified 2026-07-12
Nearby
Trip-planning places
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Depth FAQ
How deep is Big Eau Pleine Reservoir?
Big Eau Pleine Reservoir is 46 feet deep at its deepest point and averages about 16 feet, according to Wisconsin DNR records.
Is there a free depth map of Big Eau Pleine Reservoir?
Yes. 8 scanned Wisconsin DNR lake survey map sheets are free to view and zoom on LakeList. These historical surveys are not for navigation.
Where does the Big Eau Pleine Reservoir depth map come from?
The map sheets are converted from official Wisconsin DNR lake survey documents, with the source URL, checksum, and retrieval date retained for every sheet. Historical surveys are 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