Blass Lake

Sauk County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)33
Maximum Depth (ft)16
Mean Depth (ft)8
Shoreline (miles)—
Bottom Composition25% sand, 10% gravel, 0% rock, 65% muck
Water Clarity — Secchi Depth (ft)—
Trophic Status—
Drainage BasinDRAINAGE
Lake Classflowage
Public Access—
Township—
GPS Coordinates43.59570° N, 89.80830° W
WBIC (DNR ID)1295800

Fish Species

3 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
Largemouth BassCommon—
Northern PikeCommon—
PanfishCommon—

Boat Landings

1 landing

NameTypeRampTrailersFee♿
Lake Blass AccessCARRY-IN—0—No

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—
Eurasian Water-MilfoilConfirmed—

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