Lake Du Bay

Marathon, Portage County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)4,649
Maximum Depth (ft)30
Mean Depth (ft)
Shoreline (miles)
Bottom Composition0% sand, 0% gravel, 0% rock, 25% muck
Water Clarity — Secchi Depth (ft)
Trophic Status
Drainage BasinDRAINAGE
Lake Classflowage
Public Access
Township
GPS Coordinates44.69660° N, 89.68700° W
WBIC (DNR ID)1412200

Fish Species

6 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
WalleyeAbundant
Northern PikeCommon
PanfishCommon
Smallmouth BassCommon
Largemouth BassPresent
MuskyPresent

Boat Landings

4 landings

NameTypeRampTrailersFee
Lake Du Bay AccessRAMP16-20NoNo
Seagull RampRAMP6-10NoNo
Lake Du Bay AccessRAMP1-5NoNo
Big Eau Pleine River AccessRAMPUnknownNo

Invasive Species

Invasive species have been documented in or near this lake. Please clean, drain, and dry all watercraft and equipment before leaving to prevent spread.

SpeciesStatusFirst Detected
Chinese Mystery SnailConfirmed
Curly-Leaf PondweedConfirmed
Eurasian Water-MilfoilConfirmed
Japanese knotweed (Fallopia japonica)Confirmed
Purple LoosestrifeConfirmed
Rusty CrayfishConfirmed

Data sourced from Wisconsin DNR lake surveys. Last scraped: 4/29/2026.