Grand Portage Lake

Iron County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)148
Maximum Depth (ft)33
Mean Depth (ft)15
Shoreline (miles)—
Bottom Composition20% sand, 30% gravel, 0% rock, 50% muck
Water Clarity — Secchi Depth (ft)—
Trophic Status—
Drainage BasinDRAINAGE
Lake Classlake
Public Access—
Township—
GPS Coordinates46.17310° N, 90.04940° W
WBIC (DNR ID)2314100

Fish Species

6 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
Largemouth BassCommon—
MuskyCommon—
Northern PikeCommon—
PanfishCommon—
WalleyeCommon—
Smallmouth BassPresent—

Boat Landings

1 landing

NameTypeRampTrailersFee♿
Grand Portage Lake RampRAMP—1-5NoNo

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—
Yellow IrisConfirmed—

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