Ottawa Lake

Waukesha County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)17
Maximum Depth (ft)16
Mean Depth (ft)7
Shoreline (miles)—
Bottom Composition10% sand, 0% gravel, 0% rock, 90% muck
Water Clarity — Secchi Depth (ft)—
Trophic Status—
Drainage BasinSPRING
Lake Classlake
Public Access—
Township—
GPS Coordinates42.93900° N, 88.48110° W
WBIC (DNR ID)822200

Fish Species

4 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
PanfishCommon—
Largemouth BassPresent—
Northern PikePresent—
WalleyePresent—

Boat Landings

1 landing

NameTypeRampTrailersFee♿
Ottawa LakeRAMP—UnknownNo—

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—
Purple LoosestrifeConfirmed—
Spiny NaiadConfirmed—

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

Ottawa Lake — Facts & Figures | Stay Northern