Lake Koshkonong

Jefferson, Dane, Rock County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)10,595
Maximum Depth (ft)7
Mean Depth (ft)5
Shoreline (miles)
Bottom Composition10% sand, 10% gravel, 0% rock, 80% muck
Water Clarity — Secchi Depth (ft)
Trophic Status
Drainage BasinDRAINAGE
Lake Classlake
Public Access
Township
GPS Coordinates42.87240° N, 88.96120° W
WBIC (DNR ID)808700

Fish Species

7 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
PanfishCommon
CatfishPresent
Largemouth BassPresent
MuskyPresent
Northern PikePresent
Smallmouth BassPresent
WalleyePresent

Boat Landings

4 landings

NameTypeRampTrailersFee
Bingham Road Boat RampRAMP1-5NoNo
Vinne HaHa LandingRAMP11-15NoNo
Lake Koshkonong AccessRAMP6-10NoNo
Royce-Dallman County Park Boat RampRAMP21-25NoNo

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
Curly-Leaf PondweedConfirmed
Zebra MusselConfirmed

Data sourced from Wisconsin DNR lake surveys. Last scraped: 4/30/2026.