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
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
Curly-Leaf PondweedConfirmed
Purple LoosestrifeConfirmed
Spiny NaiadConfirmed

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

Ottawa Lake — Facts & Figures | Stay Northern