What Rhinelander Flowage is and why it matters

Rhinelander Flowage is a shallow, 4,400-acre impoundment in Oneida County that sits at the heart of central Wisconsin's walleye country. It was created in the early 1900s when a dam was built on the Wisconsin River, and it has become one of the region's most productive walleye fisheries. The lake averages 8 to 10 feet deep, with a maximum depth around 25 feet—a profile that keeps the water warm and supports dense weed growth, both of which walleye love.

What makes Rhinelander Flowage distinct from other Northwoods lakes is its character as a working flowage. The water level fluctuates seasonally to serve hydroelectric and flood-control purposes, which means the shoreline and shallow bays change throughout the year. That same fluctuation, though, creates ideal conditions for walleye: rising water in spring floods the weeds and brush, and falling water in late summer concentrates fish in deeper holes. If you understand how the water level moves, you understand where the walleye will be.

Key Takeaways

  • Rhinelander Flowage holds walleye year-round, with spring and fall offering the most consistent action in shallow weeds and along structure.
  • The lake's shallow profile and heavy weed growth mean jigging and live-bait rigging work better than casting, and you need to fish slowly.
  • Water-level changes tied to dam operations shift where fish hold, so checking the current level before you launch saves time on the water.
  • Summer can be productive early and late in the day, but midday heat pushes walleye deep; winter ice fishing on the flowage is popular and can be excellent.

Spring walleye: timing the spawn and post-spawn bite

Spring on Rhinelander Flowage begins in late April or early May, when water temperatures climb into the upper 40s and walleye move shallow to spawn. The best fishing happens just before and just after the spawn—roughly the two weeks on either side of peak spawning, which usually falls in early to mid-May. During this window, walleye are aggressive and predictable: they stage in 4 to 8 feet of water along the weed edges and in the shallow bays where current flows from the dam.

Fish the edges of emergent weeds—cattails and rushes that stick above the water—with live shiners or crawlers on a jig-and-minnow rig. Cast parallel to the weed line rather than into it; walleye hunt along the edge, not buried in the vegetation. If the water level is rising (which it often is in spring), the fish will move shallower as the week progresses, so don't be afraid to fish 2 to 4 feet of water on the last few days before the level stabilizes.

Summer: early mornings, late evenings, and deep structure

By mid-June, surface water temperatures on Rhinelander Flowage climb into the low 70s, and walleye retreat from the shallows. The bite doesn't disappear—it just moves and compresses into narrow windows. Fish hard from sunrise until about 9 a.m., then again from 7 p.m. until dark. During the middle of the day, walleye drop to 12 to 18 feet, where they hold tight to deeper weed edges, rock piles, and the channel of the old Wisconsin River that runs through the flowage.

If you want to fish midday, focus on structure: use your sounder to find the deepest holes and the sharpest weed edges, then work them with a vertical jig tipped with a minnow or crawler. Drop straight down, lift slowly, and repeat. It's not glamorous, but it works. Early and late, return to the shallow bays and weed edges with live bait and patience—the fish are there, and they're feeding.

Fall: the second-best season on the flowage

September and October bring the year's second-best walleye bite. Water temperatures drop back into the 60s, and walleye move shallow again to feed heavily before winter. The weed edges that were productive in spring come alive again, and the fish are less picky about presentation. Jig-and-minnow rigs, live-bait rigs, and even crankbaits that mimic shiners all work.

Fall also brings lower water levels as the dam operators prepare for winter. This concentration effect—fish pushed into smaller areas as the lake shrinks—can make fishing even better. Pay attention to the water level; if it drops a foot or more in a week, the fish will be in the deepest holes and along the steepest drop-offs. Fish these spots hard for the first few days after a drop, then adjust as the fish redistribute.

Winter ice fishing and the frozen-over season

Rhinelander Flowage freezes solid by late December and stays frozen through early April. Ice fishing is popular here, and for good reason: walleye remain active under the ice, and the shallow profile means you don't have to drill in 30 feet of water to find them. Most anglers fish 6 to 12 feet of water along weed edges and in the deeper bays, using small jigging spoons tipped with minnow heads or live shiners.

The bite is steadiest in early winter (December and early January) and again in late winter (late February through March), when walleye are most active. Mid-winter can be slow, but it's not dead—you'll catch fish if you're patient and mobile. Move frequently, drill multiple holes, and don't stay in one spot longer than 15 or 20 minutes if you're not getting bites. The ice road across the flowage is well-traveled, and local bait shops in Rhinelander can tell you which areas are producing.

Reading the water level and planning your trip

The Wisconsin River dam that creates Rhinelander Flowage is operated by Rhinelander Paper Company (now part of Domtar), and water levels are managed for power generation and flood control. The level can rise or fall by 2 to 4 feet over the course of a few weeks, which dramatically changes where walleye hold. Before you launch, check the current level and compare it to historical norms for that time of year.

You can find current water-level information through the U.S. Geological Survey's real-time streamflow data for the Wisconsin River at Rhinelander, or by calling the Rhinelander Paper Company dam office. Local bait and tackle shops—including several in Rhinelander itself—also track the level and can tell you whether it's rising, falling, or stable. A rising level means fish are moving shallow and spreading out; a falling level concentrates them in the deepest available water. Plan your fishing accordingly.

Access points and where to launch

Rhinelander Flowage has several public boat launches. The main launch is at Boom Lake Access, located on the south side of the flowage near Highway 8. This is a full-service ramp with parking and is the most popular entry point. Smaller launches exist on the north side of the flowage, though they can be tight and are better suited to smaller boats or canoes.

The flowage is also accessible by canoe or kayak from several points along the Wisconsin River above the dam. If you're exploring the upper end of the flowage or fishing the river channel, a smaller boat or paddle craft gives you more flexibility. Bait and tackle shops in Rhinelander can point you to secondary launches and tell you which areas are easiest to reach from each one.

Frequently Asked Questions

What's the best bait for walleye on Rhinelander Flowage?

Live shiners and crawlers work best, especially in spring and fall. In summer, when fish are deeper and less aggressive, a live shiner on a jig often outperforms other options. Leeches work too, but they're less common on this lake than on others in the region.

Can I fish Rhinelander Flowage in winter without a shelter?

Yes, but it's cold and exposed. Many anglers use portable shelters or fish from the shoreline in protected bays. The ice is typically safe by mid-January, but always check local conditions and never fish alone on unfamiliar ice.

How deep should I fish if I don't know where the walleye are?

Start in 6 to 10 feet of water along weed edges. This depth range holds walleye in most seasons on Rhinelander Flowage. If you're not getting bites after 20 minutes, move to a different weed edge or drop to 12 to 15 feet.

What happens to the fishing when the water level drops?

Fish concentrate in the deepest holes and along the steepest drop-offs. The first few days after a significant drop are often excellent because walleye are crowded into smaller areas. After a week or so, they redistribute, and fishing normalizes.

Is Rhinelander Flowage better than other Northwoods lakes for walleye?

It's consistently productive and shallow enough that you can fish it effectively without a deep-water sounder. Other lakes in the region hold walleye too, but Rhinelander Flowage's weed growth and structure make it a reliable choice for anglers who like to work shallow water and live bait.