What You'll Find at Fishtrap Lake

Fishtrap Lake is a 1,400-acre impoundment in Vilas County, about fifteen minutes south of Boulder Junction. It's a classic northern Wisconsin warmwater lake—shallow in places, with weedy bays and deeper holes that hold walleye and northern pike year-round. The lake sits in the heart of the Northwoods, surrounded by state forest and accessible from Highway 51, which makes it less crowded than some of the famous Boulder Junction chain lakes but still well-developed with public boat landings and resorts.

The character of Fishtrap is its structure. Weed beds dominate the shallower sections, particularly along the eastern and northern shorelines. The lake bottom transitions from muck and sand in the bays to firmer substrate in the deeper basins. These depth changes and vegetation patterns are what make the lake hold fish consistently through the seasons—walleye move between shallow feeding areas and deeper daytime sanctuaries, and pike hunt the weed edges year-round.

Key Takeaways

  • Fishtrap Lake holds walleye and northern pike in a 1,400-acre impoundment with shallow weed bays and deeper basins typical of Vilas County.
  • Spring and fall are peak seasons for walleye; summer requires deeper presentations and night fishing; winter ice fishing focuses on the basin areas and weed-line transitions.
  • Public boat landings are available on the south shore, and the lake is surrounded by state forest with minimal residential development on much of the shoreline.
  • Fishtrap connects to the Trout River system, which influences water levels and fish movement, particularly in spring and after heavy rain.

Spring Walleye: The Shallow-Water Window

Spring on Fishtrap begins in late April and runs through May. Walleye move shallow to feed after spawning, and the weed beds are just beginning to green up—not so thick that you can't work a jig or crankbait through them. The northern and eastern bays warm first because they face the sun and receive runoff from the surrounding forest. Fish these areas in 4 to 8 feet of water, working the weed edges and the transition zones where sand meets muck.

Live bait works well in spring: shiners or small crawfish on a jig, or a simple slip-sinker rig with a live shiner drifted along the weed line. Early morning and late evening are most productive, but spring walleye will bite through midday if you're working the right depth. The water is still cool—in the 45 to 55 degree range—so fish move slowly and don't chase lures far. Patience and a slow presentation matter more than speed.

Summer: Deeper Water and Night Fishing

By June, the weed beds have thickened and the lake stratifies. Walleye retreat to deeper water during the day, typically 15 to 25 feet, and move shallow only at night to feed. Summer fishing on Fishtrap means either fishing deep structure during the day with live bait or vertical jigging, or fishing shallow at night with crankbaits and soft plastics.

Night fishing is often more productive in summer. Work the shallow bays and weed edges after dark with a headlamp and a 5 to 7-foot crankbait or a soft plastic on a jig. The walleye move into 3 to 6 feet of water to hunt, and the reduced light makes them less cautious. Northern pike are also active at night, so be ready for aggressive strikes. If you prefer daytime fishing, focus on the deeper basins in the center of the lake and the drop-offs along the eastern shore, where the lake bottom falls away sharply.

Fall: The Second Peak Season

Fall—September through October—mirrors spring in many ways. Water temperatures drop, walleye move back into the shallows to feed heavily before winter, and the weed beds begin to die back, making them easier to fish. The difference is that fall fish are more aggressive and feed longer into the day. You can catch walleye from sunrise to sunset, particularly in the first two weeks of September.

Work the same shallow bays and weed edges you fished in spring, but with more confidence. Crankbaits that mimic baitfish—shad patterns or perch patterns—work well. So do jigs tipped with live bait or soft plastics. The water is clearing as the summer algae blooms fade, so fish can see your lure from farther away. This is also when northern pike are most active, so if you're targeting walleye and a pike hits, don't be surprised—it's part of the fall pattern on Fishtrap.

Winter Ice Fishing

Fishtrap freezes solid by late December and stays frozen through February. Ice fishing focuses on two areas: the deeper basins in the center of the lake, where walleye suspend in 20 to 30 feet of water, and the transition zones where shallow weed beds drop off into deeper water. The weed-line areas are particularly productive because they concentrate both walleye and pike.

Jigging with live minnows—shiners or chubs—is the standard approach. Drop your jig to the bottom, then work it slowly, pausing frequently to let the minnow's movement attract fish. Many anglers set tip-ups as well, particularly for pike. The ice is typically safe by early January, but check with local resorts or the Wisconsin DNR before heading out. Winter can be slow compared to spring and fall, but the fish are there if you're patient and willing to drill multiple holes to find them.

Public Access and Boat Landings

Fishtrap Lake has a public boat landing on the south shore, accessible from County Road M. The landing has a paved ramp, parking for trailers, and a small pier. This is the primary public access point and is maintained by Vilas County. The lake is surrounded by state forest on much of its shoreline, which means less residential development and more natural habitat than some of the more crowded Boulder Junction chain lakes.

Several resorts and private cottages line the western and southern shores, but they don't dominate the lake. If you're launching from the public landing, you'll have plenty of room to fish without feeling crowded. The lake is large enough that you can find quiet water even on busy weekends, particularly if you're willing to fish the northern bays or the deeper basins away from the main shoreline.

Trout River Connection and Water Levels

Fishtrap Lake is part of the Trout River system, which flows south toward the Wisconsin River. This connection means that water levels can fluctuate with spring snowmelt and heavy rain. In wet springs, the lake can rise several feet, which pushes walleye into the flooded timber and brush along the shoreline—excellent habitat for feeding fish. In dry summers, water levels can drop, concentrating fish in the deeper basins.

Understanding these seasonal water-level changes helps you adjust your fishing strategy. In high-water springs, fish the shallow, newly flooded areas. In low-water summers, focus on the deeper holes and the main-lake structure. The Trout River outlet, on the southern end of the lake, is worth exploring in spring when water is flowing—walleye often stage near the outlet before moving upstream to spawn.

Frequently Asked Questions

What's the best time of year to fish Fishtrap Lake?

Spring (late April through May) and fall (September through October) are the most productive seasons. Walleye are shallow and aggressive during both periods. Summer can be good if you're willing to fish at night or work deeper water during the day. Winter ice fishing is possible but slower than the other seasons.

Do I need a boat to fish Fishtrap Lake?

A boat gives you access to the deeper structure and the weed-line transitions that hold the most fish. However, you can fish from shore along the public landing and the state forest shoreline. Shore fishing is best in spring and fall when walleye are shallow, and at night in summer when they move into the shallows to feed.

What size northern pike can I expect?

Fishtrap holds pike ranging from 18 inches to over 30 inches. The lake has a healthy pike population, and they're often caught incidentally while targeting walleye. Pike are most active in fall and winter, and they hunt the weed edges throughout the year.

Is Fishtrap Lake less crowded than the Boulder Junction chain lakes?

Yes. While it's a well-known lake with public access and resorts, it doesn't draw the same volume of anglers as some of the more famous Boulder Junction lakes. The 1,400-acre size and the state forest shoreline mean you can find quiet water, particularly if you're fishing early morning or late evening.

What should I know about the Trout River outlet?

The outlet on the southern end of the lake is worth fishing in spring when water is flowing. Walleye stage near the outlet before moving upstream to spawn, and it's a natural concentration point. The outlet area is shallow and weedy, so work jigs and live bait carefully to avoid snagging.