Little Therriault 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 Little Therriault 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 Little Therriault Lake on the board.

Fishing Little Therriault Lake: what the data says

18-acre lake in Lincoln County, Montana. The lake tops out around 25 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.

There are 0.8 miles of drawn shoreline to work. At index 1.1 the outline is almost a bowl — read the depth changes, not the shoreline. 74% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Call it 0.3 mi long by 0.2 mi wide at the broadest reach. The water lies in Lincoln County. For a second option, BIG THERRIAULT LAKE lies 1 mi southeast.

Cutthroat Trout fishing at Little Therriault Lake

Early season cutthroat trout use the shallows, holding in 3 to 15 ft. Summer is a 7 to 25 ft game here, winter a 6 to 25 ft one. The chart's best answer is Break off the point — drop-off, 9 ft, prime for summer. Best bite is early morning and the evening. Tie on a trolled spoon (small) or an inline spinner and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 15 ft	dawn & dusk	Main-lake point (4 ft)	Inline spinner (silver/gold), Small spoon
Summer	7 to 25 ft	dawn & dusk	Break off the point (9 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (4 ft)	Casting spoon, Inline spinner
Winter	6 to 25 ft	dawn	Break off the point (9 ft)	Small jigging spoon, Marabou jig

Notable structure

4 pieces of structure are mapped here — Deep basin, around 25 ft, is the deepest of them.

Deep basin: deep basin, around 25 ft
Break off the point: drop-off, around 9 ft
Shallow bay flat: weed flat, around 5 ft
Main-lake point: point, around 4 ft

Little Therriault 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 Little Therriault Lake specifically, so confirm the current rules before you fish.

Check the official Montana fishing regulations →

Common questions

How deep is Little Therriault Lake?

Little Therriault Lake is about 25 ft (8 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 Little Therriault Lake?

Anglers target cutthroat trout on Little Therriault Lake.

Where is the best fishing spot on Little Therriault Lake?

Break off the point is the top-rated area: a drop-off in about 9 ft of water that rates prime for cutthroat trout in summer. Every other rated spot, per species and season, is on the map above.

When is the best time to fish Little Therriault 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 Little Therriault Lake?

Fishing on Little Therriault 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

BIG THERRIAULT LAKE 1 mi · Glen Lake 6 mi · Rock Lake 10 mi · Long Lake (Lincoln) 10 mi · Moran Lake 10 mi · Tetrault Lake 10 mi · Sophie Lake 10 mi · Shotnana Lake 11 mi, BC · Frank Lake 11 mi · Martin Lake (Lincoln) 14 mi · Murphy Lake 14 mi · Edwards Lakes 15 mi, BC

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

More water nearby: Lincoln County fishing maps (28 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.