Upper Martin 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 Upper Martin 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 Upper Martin Lake on the board.

Fishing Upper Martin Lake: what the data says

12-acre lake in Flathead County, Montana. The lake tops out around 60 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. Every species below gets its seasonal read from the same numbers driving the chart.

The drawn water covers 12 acres wrapped in 1 miles of bank. With a 1.9 development index there's bank structure worth casting at, in moderation. The shallow band under 15 ft claims about 11% of the surface — that's where the groceries are. The basin spans about 0.5 mi end to end. It sits in Flathead County. Lower Stillwater Lake sits 4 mi southeast — the closest neighbouring chart.

Cutthroat Trout fishing at Upper Martin Lake

In spring, cutthroat trout run shallow here, mostly 3 to 15 ft. Midsummer fish sit out in 10 to 35 ft before dropping to 10 to 40 ft for winter. Fall cutthroat trout concentrate at Main-lake point, a prime-rated point around 13 ft. Fish it in early morning and the evening and you'll meet the bite. 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 (13 ft)	Inline spinner (silver/gold), Small spoon
Summer	10 to 35 ft	dawn & dusk	Main-lake point (13 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (13 ft)	Casting spoon, Inline spinner
Winter	10 to 40 ft	dawn	Break off the point (42 ft)	Small jigging spoon, Marabou jig

Notable structure

Count 4 structure marks on this chart. The deepest, Deep basin, sits near 49 ft.

Deep basin: deep basin, around 49 ft
Break off the point: drop-off, around 42 ft
Secondary point: point, around 17 ft
Main-lake point: point, around 13 ft

Upper Martin 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 Upper Martin Lake specifically, so confirm the current rules before you fish.

Check the official Montana fishing regulations →

Common questions

How deep is Upper Martin Lake?

Upper Martin Lake is about 60 ft (18 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 Upper Martin Lake?

Anglers target cutthroat trout on Upper Martin Lake.

Where is the best fishing spot on Upper Martin Lake?

Main-lake point is the top-rated area: a point in about 13 ft of water that rates prime for cutthroat trout in fall. Scroll up to the map for the complete spot list by species and season.

When is the best time to fish Upper Martin 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 Upper Martin Lake?

Fishing on Upper Martin 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

Lower Stillwater Lake 4 mi · Big Fire Lake 6 mi · Fish Lake (Lincoln) 9 mi · Blue Lake (Flathead) 9 mi · Upper Whitefish Lake 10 mi · Bootjack Lake (Flathead) 11 mi · Tally Lake 11 mi · Murray Lake 11 mi · Woods Lake 12 mi · Moose Lake 12 mi · Little Beaver Lake 12 mi · Beaver Lake 13 mi

See how Upper Martin 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.