O'Brien Lake

Iron County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)76
Maximum Depth (ft)12
Mean Depth (ft)7
Shoreline (miles)
Bottom Composition15% sand, 30% gravel, 40% rock, 15% muck
Water Clarity — Secchi Depth (ft)
Trophic Status
Drainage BasinDRAINAGE
Lake Classflowage
Public Access
Township
GPS Coordinates46.29770° N, 90.39790° W
WBIC (DNR ID)2928400

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
Chinese Mystery SnailConfirmed

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

O'Brien Lake — Facts & Figures | Stay Northern