Rainbow Flowage
By Lake Tomahawk. 3,153 acres, 28 feet at the deepest.
Ice on Rainbow Flowage
No ice reports from Rainbow Flowage in the last two weeks.
What folks saw out there, not the DNR. No ice is safe ice; check it yourself.
Fish
- Plenty of: panfish
- Common: northern pike and walleye
- Also there: musky, largemouth bass and smallmouth bass
How the DNR lists them. It doesn't say how the fishing is.
Boat landings
- Near South Rainbow DrMap · DNR details
- Cth DMap · DNR details
- Off Cth JMap · DNR details
- Near Rainbow Lake RdMap · DNR details
Water and bottom
- Bottom: 65% sand, 10% gravel, 25% muck
- Kind of lake: a drainage lake: a stream runs in and out
Invasive species
The DNR has found banded mystery snail, Chinese mystery snail, curly-leaf pondweed, Eurasian water-milfoil 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. 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 3,153 acres today. The DNR's original (PDF)
Lake facts from the Wisconsin DNR's page for Rainbow Flowage, checked October 26, 2026.