Glenns 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 on this water are approximations. Never use for navigation. Always check local regulations.

Loading depth chart…

Recent catches at Glenns 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 Glenns Lake on the board.

Fishing Glenns Lake: what the data says

254-acre lake in Montana. The lake tops out around 28 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. Here is how the season plays out for each species, straight from the data behind the map.

Traced from the shoreline, Glenns Lake runs 253 acres with 6.1 miles of edge. An index of 2.8 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. Littoral water — the productive band under ~15 ft — makes up 85% of this chart, as modeled. End to end it runs roughly 2.6 mi, about 0.3 mi across. The nearest mapped water is Redrock Lake, 8 mi to the southeast.

Rainbow Trout fishing at Glenns Lake

Spring puts rainbow trout in skinny water — 5 to 20 ft is the zone. Warm water sends them out to 7 to 28 ft; cold water stacks them in 6 to 28 ft. Break off the point is the standout, a drop-off at roughly 13 ft, rated prime for winter rainbow trout. Plan around early morning and the evening in the warm months. A dodger + spoon (deep troll) or a flutter spoon covers the summer program.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Main-lake point (8 ft)	Inline spinner (silver), Small spoon
Summer	7 to 28 ft	dawn & dusk	Break off the point (13 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	8 to 28 ft	dawn & dusk	Main-lake point (8 ft)	Casting spoon, Jerkbait over shoals
Winter	6 to 28 ft	dawn	Break off the point (13 ft)	Jigging spoon, Tube jig (white)

Brown Trout fishing at Glenns Lake

Come spring, look for brown trout tight to the bank in 3 to 25 ft. They move out to 8 to 28 ft in summer and finish the year down in 4 to 28 ft. If you only fish one area, make it Break off the point: a drop-off around 13 ft that scores prime in summer. Best bite is after dark and early morning. A spoon at the thermocline or a deep stickbait (night) is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 25 ft	dawn & dusk	Main-lake point (8 ft)	Stickbait off planer boards (shallow), Small spoon along mud lines
Summer	8 to 28 ft	night & dawn	Break off the point (13 ft)	Spoon at the thermocline, Deep stickbait (night)
Fall	5 to 28 ft	dusk & dawn	Main-lake point (8 ft)	Jerkbait over gravel, Casting spoon
Winter	4 to 28 ft	dawn	Break off the point (13 ft)	Jigging spoon, Small stickbait (slow)

Brook Trout fishing at Glenns Lake

In spring, brook trout run shallow here, mostly 2 to 15 ft. Midsummer fish sit out in 8 to 28 ft before dropping to 3 to 20 ft for winter. Summer brook trout concentrate at Deep basin, a prime-rated deep basin around 24 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 15 ft	dawn & dusk	Main-lake point (8 ft)	Small inline spinner (gold), Tiny spoon
Summer	8 to 28 ft	dawn & dusk	Deep basin (24 ft)	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	2 to 15 ft	midday & dawn	Main-lake point (8 ft)	Small spoon (orange), Spinner
Winter	3 to 20 ft	dawn	Break off the point (13 ft)	Small jigging spoon, Tungsten jig + plastic

Yellow Perch fishing at Glenns Lake

Come spring, look for yellow perch tight to the bank in 3 to 12 ft. Expect a summer slide to 8 to 28 ft, then a winter hold in 8 to 28 ft. Start at Shallow bay flat. It's a weed flat holding about 3 ft of water and rates prime come spring. Prime time lands in early morning. A drop-shot micro plastics or a small spoon tipped with worm is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (3 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	8 to 28 ft	dawn	Deep basin (24 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	8 to 28 ft	midday	Deep basin (24 ft)	Jigging spoon (small), Perch rig / spreader
Winter	8 to 28 ft	midday & dawn	Deep basin (24 ft)	Tungsten jig + spikes, Rattle spoon (small)

Notable structure

The chart marks 6 structure features on Glenns Lake; the deepest is Deep basin at about 24 ft.

Deep basin: deep basin, around 24 ft
Break off the point: drop-off, around 13 ft
Main-lake point: point, around 8 ft
Secondary point: point, around 8 ft
Shallow bay flat: weed flat, around 3 ft
Back-bay flat: weed flat, around 3 ft

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

Check the official Montana fishing regulations →

Common questions

How deep is Glenns Lake?

Glenns Lake is about 28 ft (9 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.

What fish are in Glenns Lake?

Anglers target rainbow trout, brown trout, brook trout, yellow perch on Glenns Lake.

Where is the best fishing spot on Glenns Lake?

Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for yellow perch in spring. The interactive chart above rates every spot for each species and season.

When is the best time to fish Glenns Lake?

For rainbow 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 Glenns Lake?

Fishing on Glenns 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

Redrock Lake 8 mi · Lake Sherburne 11 mi · Lake Wurdeman 12 mi · Evangeline Lake 12 mi · Camas Lake 12 mi · Forum Lake 15 mi, BC · Wall Lake 16 mi, BC · Payne Lake 16 mi, AB · Outpost Lake 17 mi, AB · Ashman Lake 19 mi, BC · Gunsight Lake 19 mi · Lake McDonald 23 mi

See how Glenns Lake stacks up: best rainbow trout lakes in Montana · best yellow perch lakes in Montana · best brown trout lakes in Montana · best brook trout lakes in Montana

Browse all Montana 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.