Lake Agnes 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.

Loading depth chart…

Recent catches at Lake Agnes

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 Lake Agnes on the board.

Fishing Lake Agnes: what the data says

129-acre lake in Beaverhead County, Montana. The lake tops out around 59 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. The rest of this page walks each species through its year, using the map's own scoring.

The outline encloses 129 acres, worked by 1.9 miles of shoreline. The basin is a simple one (shoreline index 1.2) — close to a bowl, so the structure on the chart matters more than the bank. About 12% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. End to end it runs roughly 0.8 mi, about 0.4 mi across. Beaverhead County claims this one. Brownes Lake sits 1 mi northeast — the closest neighbouring chart.

Walleye fishing at Lake Agnes

Spring puts walleye in skinny water — 4 to 15 ft is the zone. As the season builds they drop to 15 to 35 ft, wintering in 20 to 40 ft. Fall walleye concentrate at Secondary point, a prime-rated point around 8 ft. Warm-month bites cluster around the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) covers the summer program.

Season	Depth	Best window	Start at	Go-to baits
Spring	4 to 15 ft	dusk & dawn	Secondary point (8 ft)	1/8 oz jig + minnow, Hair jig
Summer	15 to 35 ft	dusk & dawn	Secondary point (8 ft)	Crawler harness on bottom bouncer, Deep crankbait (trolled)
Fall	12 to 40 ft	dusk & night	Secondary point (8 ft)	Jigging rap, Jig + big minnow
Winter	20 to 40 ft	dusk & dawn	Deep basin (59 ft)	Jigging spoon + minnow head, Rattle bait

Northern Pike fishing at Lake Agnes

Come spring, look for northern pike tight to the bank in 2 to 8 ft. Expect a summer slide to 8 to 20 ft, then a winter hold in 5 to 15 ft. Start at Shallow bay flat. It's a feeding flat holding about 4 ft of water and rates prime come spring. Prime time lands in early morning and the evening. A bucktail or a weedless spoon over cabbage is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 8 ft	midday & dawn	Shallow bay flat (4 ft)	#5 inline spinner, Spoon (red/white)
Summer	8 to 20 ft	dawn & dusk	Back-bay flat (11 ft)	Bucktail, Weedless spoon over cabbage
Fall	6 to 18 ft	midday & dawn	Secondary point (8 ft)	Big rubber (Bull Dawg style), Husky-style jerkbait
Winter	5 to 15 ft	midday	Back-bay flat (11 ft)	Tip-ups, Large jigging spoon

Yellow Perch fishing at Lake Agnes

Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 15 to 35 ft. The spot to know is Shallow bay flat, a feeding flat in about 4 ft of water that rates prime for yellow perch in spring. Warm-month bites cluster around early morning. Throw a drop-shot micro plastics or a small spoon tipped with worm until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (4 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	10 to 30 ft	dawn	Back-bay flat (11 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	12 to 35 ft	midday	Deep basin (59 ft)	Jigging spoon (small), Perch rig / spreader
Winter	15 to 35 ft	midday & dawn	Deep basin (59 ft)	Tungsten jig + spikes, Rattle spoon (small)

Smallmouth Bass fishing at Lake Agnes

Come spring, look for smallmouth bass tight to the bank in 3 to 12 ft. Expect a summer slide to 10 to 30 ft, then a winter hold in 20 to 45 ft. Start at Secondary point. It's a point holding about 8 ft of water and rates prime come fall. Prime time lands in early morning and the evening. A drop shot (goby/minnow) or a ned rig is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	dawn & dusk	Secondary point (8 ft)	Ned rig, Tube jig
Summer	10 to 30 ft	dawn & dusk	Secondary point (8 ft)	Drop shot (goby/minnow), Ned rig
Fall	8 to 25 ft	midday & dawn	Secondary point (8 ft)	Jerkbait, Blade bait
Winter	20 to 45 ft	midday	Break off the point (59 ft)	Blade bait, Hair jig

Rainbow Trout fishing at Lake Agnes

Early season rainbow trout use the shallows, holding in 5 to 20 ft. Summer is an 8 to 30 ft game here, winter an 8 to 40 ft one. The chart's best answer is Secondary point — point, 8 ft, prime for spring. Best bite is early morning and the evening. Tie on a dodger + spoon (deep troll) or a flutter spoon and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Secondary point (8 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Secondary point (8 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Secondary point (8 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 40 ft	dawn	Break off the point (59 ft)	Jigging spoon, Tube jig (white)

Lake Trout fishing at Lake Agnes

Come spring, look for lake trout tight to the bank in 10 to 40 ft. They move out to 18 to 59 ft in summer and finish the year down in 15 to 59 ft. If you only fish one area, make it Deep basin: a deep basin around 59 ft that scores prime in summer. Best bite is early morning. A white tube jig (deep) or a magnum spoon on downrigger is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	10 to 40 ft	dawn & dusk	Secondary point (8 ft)	Casting spoon over shoals, Jerkbait (shallow)
Summer	18 to 59 ft	dawn	Deep basin (59 ft)	White tube jig (deep), Magnum spoon on downrigger
Fall	10 to 50 ft	dusk & dawn	Secondary point (8 ft)	Heavy casting spoon, Jigging rap over reefs
Winter	15 to 59 ft	dawn	Deep basin (59 ft)	White tube jig, Airplane jig

Lake Agnes also holds crappie (10 to 25 ft in summer), channel catfish (8 to 25 ft in summer). Pick any of them on the map above for rated spots and bait picks.

Notable structure

6 pieces of structure are mapped here — Deep basin, around 59 ft, is the deepest of them.

Deep basin: deep basin, around 59 ft
Break off the point: drop-off, around 59 ft
Back-bay flat: feeding flat, around 11 ft
Secondary point: point, around 8 ft
Shallow bay flat: feeding flat, around 4 ft
Main-lake point: point, around 2 ft

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

Check the official Montana fishing regulations →

Common questions

How deep is Lake Agnes?

Lake Agnes is about 59 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 Lake Agnes?

Anglers target walleye, northern pike, yellow perch, smallmouth bass, rainbow trout, lake trout, crappie, channel catfish on Lake Agnes. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.

Where is the best fishing spot on Lake Agnes?

Secondary point is the top-rated area: a point in about 8 ft of water that rates prime for smallmouth bass in fall. The interactive chart above rates every spot for each species and season.

When is the best time to fish Lake Agnes?

For walleye, the summer bite is best in the evening and early morning. 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 Lake Agnes?

Fishing on Lake Agnes 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

Brownes Lake 1 mi · Rainbow Lake (Beaverhead) 2 mi · Tendoy Lake 6 mi · Deerhead Lake 6 mi · Minneopa Lake 10 mi · Sawtooth Lake 11 mi · Kelly Reservioir 14 mi · Bear Lake (Beaverhead) 19 mi · Beaverhead River 20 mi · Baldy Lake 22 mi · Sand Lake 23 mi · Lily Lake (Beaverhead) 25 mi

See how Lake Agnes stacks up: best smallmouth bass lakes in Montana · best walleye lakes in Montana · best northern pike lakes in Montana · best crappie lakes in Montana

More water nearby: Beaverhead County fishing maps (24 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.