Mary Lake

Oconto, Langlade County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)154
Maximum Depth (ft)20
Mean Depth (ft)—
Shoreline (miles)—
Bottom Composition40% sand, 0% gravel, 0% rock, 60% muck
Water Clarity — Secchi Depth (ft)—
Trophic Status—
Drainage BasinDRAINAGE
Lake Classlake
Public Access—
Township—
GPS Coordinates45.29200° N, 88.68430° W
WBIC (DNR ID)496300

Fish Species

2 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
Largemouth BassCommon—
PanfishPresent—

Boat Landings

1 landing

NameTypeRampTrailersFee♿
Mary Lake AccessCARRY-IN—0NoNo

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—
Phragmites (non-native)Confirmed—

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