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448-acre reservoir in Marathon County, Wisconsin. The lake tops out around 12 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. Here's the year, species by species, as the scoring engine sees it.
On the chart, Berkhahn Flowage (Townline) draws 451 acres inside 8.1 miles of shoreline. An index of 2.7 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. Every acre of it sits shallower than ~15 ft: one big littoral zone, cover and forage throughout. The basin spans about 2.5 mi end to end and 0.6 mi across at its widest. The water lies in Marathon County. For a second option, Townline Reservoir* lies 1 mi south.
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Summer pushes them deeper, 4 to 12 ft, and winter fish settle into 4 to 12 ft. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for northern pike in spring. Warm-month bites cluster around early morning and the evening. Throw a bucktail or a weedless spoon over cabbage until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 4 to 12 ft | dawn & dusk | Shallow bay flat (3 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 4 to 12 ft | midday & dawn | Main-lake point (8 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 4 to 12 ft | midday | Shallow bay flat (3 ft) | Tip-ups, Large jigging spoon |
Berkhahn Flowage (Townline) carries 5 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 10 ft down.
Season dates, license requirements, and size and bag limits for Wisconsin waters are set by the Wisconsin DNR — and special regulations can apply to Berkhahn Flowage (Townline) specifically, so confirm the current rules before you fish.
Check the official Wisconsin fishing regulations →
Berkhahn Flowage (Townline) is about 12 ft (4 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target northern pike on Berkhahn Flowage (Townline). These come from the Wisconsin DNR's per-lake fish listing; where the DNR lists a group (panfish, catfish, trout) the specific species are resolved from Wisconsin's fish distribution by the lake's location, depth and habitat.
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for northern pike in spring. The map above holds the full rated-spot list for every species and season.
For northern pike, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Berkhahn Flowage (Townline) is regulated by the Wisconsin DNR. Check the official Wisconsin regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Townline Reservoir* 1 mi · Honey Island Flowage 2 mi · Honey Island Flowage, West 4 mi · Big Eau Pleine Reservoir 4 mi · Smoky Hill Flowage, North 4 mi · North Rice Lake 5 mi · Lake Du Bay 7 mi · Mosinee Flowage 9 mi · Anderson Lake 10 mi · Wisconsin R Fl C3-Stevens Pt 15 mi · Lake Wausau 18 mi · Bentley Pond (Dana Pond) 19 mi
See how Berkhahn Flowage (Townline) stacks up: best northern pike lakes in Wisconsin
More water nearby: Marathon County fishing maps (27 charts). Browse all Wisconsin fishing maps or see every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.