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
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
Banded Mystery SnailConfirmed
Phragmites (non-native)Confirmed

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

Mary Lake — Facts & Figures | Stay Northern