Grandmother Flowage

Lincoln County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)208
Maximum Depth (ft)22
Mean Depth (ft)
Shoreline (miles)
Bottom Composition50% sand, 15% gravel, 5% rock, 30% muck
Water Clarity — Secchi Depth (ft)
Trophic Status
Drainage BasinDRAINAGE
Lake Classflowage
Public Access
Township
GPS Coordinates45.38010° N, 89.72250° W
WBIC (DNR ID)1503000

Fish Species

6 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
Largemouth BassPresent
MuskyPresent
Northern PikePresent
PanfishPresent
Smallmouth BassPresent
WalleyePresent

Boat Landings

1 landing

NameTypeRampTrailersFee
Public Boat LandingPublic

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
Eurasian Water-MilfoilConfirmed
Rusty CrayfishConfirmed

Data sourced from Wisconsin DNR lake surveys. Last scraped: 3/24/2026.

Grandmother Flowage — Facts & Figures | Stay Northern