Thornapple Flowage

Rusk County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)266
Maximum Depth (ft)19
Mean Depth (ft)9
Shoreline (miles)
Bottom Composition35% sand, 50% gravel, 10% rock, 5% muck
Water Clarity — Secchi Depth (ft)
Trophic Status
Drainage BasinDRAINAGE
Lake Classflowage
Public Access
Township
GPS Coordinates45.41700° N, 91.19010° W
WBIC (DNR ID)2227500

Fish Species

8 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
Smallmouth BassCommon
WalleyeCommon
CatfishPresent
Largemouth BassPresent
MuskyPresent
Northern PikePresent
PanfishPresent
SturgeonPresent

Boat Landings

2 landings

NameTypeRampTrailersFee
Boat Landing 1Public
Boat Landing 2Public

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
Purple LoosestrifeConfirmed
Rusty CrayfishConfirmed

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

Thornapple Flowage — Facts & Figures | Stay Northern