Birch Lake Depth Map & Fishing Spots (MT)

Hatch outlook

Grasshoppers (east-side summer)Active window

Typical here: Jul 1 – Oct 15 · until the hard frosts of mid-October; on the Missouri, August hoppers fish mid-river, not the banks

adultall day in high summer, best when afternoon wind knocks bugs onto the water

Pulls fish to the windward grassy banks and edges for months — fish the bank the wind blows ONTO.

The friendliest crossover of the summer: on lakes, drift the windward bank with a bubble-and-foam-hopper — the bubble's splash doesn't hurt a hopper presentation. On rivers, the same rig dead-drifted along the undercut grass banks, or small gold spinners under the banks between rises.

The event happens over grassy banks, undercut edges and windward shorelines

Spruce MothActive window

Typical here: Jul 20 – Aug 31 · a conifer-forest event — it needs fir and lodgepole on the banks, so it's a Rock Creek / Blackfoot / upper Bitterroot specialty

adultmorning through midday — moths don't enter the water willingly — landings are sporadic and near the conifer banks; fish the imitation LOW in the film with minimal floatant, even fully drowned, with a little movement

When the moths show, just about every run produces — large trout key on them so hard that one pattern carries the whole box for two weeks.

Honest limit: a small drowned-surface moth has no lure analog. The workable rig is a casting bubble with a drowned moth pattern along the timbered banks in the morning; otherwise fish spinners early and late and leave the moth window to the film.

2–3 weeks at best, and day-to-day — fish key on the moths when they show and vanish with them

The event happens over banks under conifers — the moths rarely reach mid-river

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours here are interpolated from real agency depth surveys (state DNR / USACE). Never use for navigation. Always check local regulations.

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Recent catches at Birch Lake

Shared by DepthScout anglers. Exact spots stay private, always.

No shared catches here yet — be the first.Log a catch from the map above and share it to put Birch Lake on the board.

Fishing Birch Lake: what the data says

32-acre lake in Flathead County, Montana. The lake tops out around 110 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. What follows comes from the same scoring engine that paints the spots above.

Birch Lake maps at 31 acres behind 1.3 miles of shoreline. With a 1.6 development index there's bank structure worth casting at, in moderation. The shallow band under 15 ft claims about 18% of the surface — that's where the groceries are. Call it 0.5 mi long by 0.2 mi wide at the broadest reach. Flathead County claims this one. Its nearest charted neighbour, Black Lake, is 2 mi to the north.

Cutthroat Trout fishing at Birch Lake

In spring, cutthroat trout run shallow here, mostly 3 to 15 ft. Summer pushes them deeper, 10 to 35 ft, and winter fish settle into 10 to 40 ft. Break off the point is the standout, a drop-off at roughly 28 ft, rated prime for summer cutthroat trout. Time it for early morning and the evening. You won't need more than a trolled spoon (small) or an inline spinner most summer days.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 15 ft	dawn & dusk	Main-lake point (10 ft)	Inline spinner (silver/gold), Small spoon
Summer	10 to 35 ft	dawn & dusk	Break off the point (28 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (10 ft)	Casting spoon, Inline spinner
Winter	10 to 40 ft	dawn	Break off the point (28 ft)	Small jigging spoon, Marabou jig

Notable structure

Structure-wise the chart holds 4 features, led in depth by Deep basin at roughly 110 ft.

Deep basin: deep basin, around 110 ft
Break off the point: drop-off, around 28 ft
Shallow bay flat: feeding flat, around 15 ft
Main-lake point: point, around 10 ft

Birch Lake fishing regulations

Season dates, license requirements, and size and bag limits for Montana waters are set by the Montana Fish, Wildlife & Parks — and special regulations can apply to Birch Lake specifically, so confirm the current rules before you fish.

Check the official Montana fishing regulations →

Common questions

How deep is Birch Lake?

Birch Lake is about 110 ft (34 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.

What fish are in Birch Lake?

Anglers target cutthroat trout on Birch Lake.

Where is the best fishing spot on Birch Lake?

Break off the point is the top-rated area: a drop-off in about 28 ft of water that rates prime for cutthroat trout in summer. The map above holds the full rated-spot list for every species and season.

When is the best time to fish Birch Lake?

For cutthroat trout, 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.

What are the fishing regulations for Birch Lake?

Fishing on Birch Lake is regulated by the Montana Fish, Wildlife & Parks. Check the official Montana regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Black Lake 2 mi · Cliff Lake (Flathead) 2 mi · Pilgrim Lake 3 mi · Big Hawk Lake 4 mi · Handkerchief Lake 4 mi · Wildcat Lake 4 mi · Strawberry Lake 6 mi · Echo Lake (Flathead) 6 mi · Hungry Horse Reservoir 6 mi · Margaret Lake (Flathead) 6 mi · Abbot Lake 6 mi · Peterson Lake 7 mi

See how Birch Lake stacks up: best cutthroat trout lakes in Montana

More water nearby: Flathead County fishing maps (55 charts). Browse all Montana fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.