Boulder Lake

Oconto, Langlade County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)370
Maximum Depth (ft)11
Mean Depth (ft)7
Shoreline (miles)—
Bottom Composition60% sand, 20% gravel, 3% rock, 17% muck
Water Clarity — Secchi Depth (ft)—
Trophic Status—
Drainage BasinSPRING
Lake Classlake
Public Access—
Township—
GPS Coordinates45.14900° N, 88.63540° W
WBIC (DNR ID)491800

Fish Species

5 species documented

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

Boat Landings

1 landing

NameTypeRampTrailersFee♿
Boulder Lake Campground Boat RampRAMP—16-20NoYes

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
Banded Mystery SnailConfirmed—
Eurasian Water-MilfoilConfirmed—

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

Boulder Lake — Facts & Figures | Stay Northern