Boulder Lake
By Boulder Junction. 516 acres, 23 feet at the deepest.
Ice on Boulder Lake
No ice reports from Boulder Lake in the last two weeks.
What folks saw out there, not the DNR. No ice is safe ice; check it yourself.
Fish
- Plenty of: walleye
- Common: musky and panfish
- Also there: largemouth bass, smallmouth bass and northern pike
How the DNR lists them. It doesn't say how the fishing is.
Boat landings
- Boat Ramp 1Map · DNR details
- Boat Ramp 2Map · DNR details
Water and bottom
- Bottom: 60% sand, 20% gravel, 20% rock
- Kind of lake: a drainage lake: a stream runs in and out
Invasive species
The DNR has found banded mystery snail, Chinese mystery snail, purple loosestrife and rusty crayfish here.
State law: before you leave the landing, pull off any plants and critters, drain all the water out of your boat, motor, livewell and buckets, and never move live fish away from the lake.
Depth map
Wisconsin DNR lake survey map, mapped June 1975. Mind the north arrow; some of these old maps are turned sideways. It's old and not for navigation; shorelines and depths change. The DNR lists the lake at 516 acres today. The DNR's original (PDF)
Lake facts from the Wisconsin DNR's page for Boulder Lake, checked October 24, 2026.