Surveyor 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 Surveyor 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 Surveyor Lake on the board.

Fishing Surveyor Lake: what the data says

20-acre lake in Mineral County, Montana. The lake tops out around 45 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.

Drawn out, this is 20 acres of water rimmed by 0.6 miles of bank. A shoreline index of 1 says round and simple: fish relate to depth changes here, not shoreline features. Littoral water — the productive band under ~15 ft — makes up 24% of this chart. You'll find it in Mineral County. Closest neighbour on DepthScout: Cedar Log Lake, South, 4 mi southwest of here.

Cutthroat Trout fishing at Surveyor Lake

Spring cutthroat trout on Surveyor Lake hold shallow, usually 3 to 15 ft. By summer they slide out to 10 to 35 ft, and by winter most fish are in 10 to 40 ft. The chart's best answer is Main-lake point — point, 22 ft, prime for fall. Prime time lands in early morning and the evening. The summer box starts with a trolled spoon (small) or an inline spinner.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 15 ft	dawn & dusk	open water	Inline spinner (silver/gold), Small spoon
Summer	10 to 35 ft	dawn & dusk	Main-lake point (22 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (22 ft)	Casting spoon, Inline spinner
Winter	10 to 40 ft	dawn	Break off the point (44 ft)	Small jigging spoon, Marabou jig

Rainbow Trout fishing at Surveyor Lake

Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. Summer pushes them deeper, 8 to 30 ft, and winter fish settle into 8 to 40 ft. The spot to know is Main-lake point, a point in about 22 ft of water that rates prime for rainbow trout in fall. Warm-month bites cluster around early morning and the evening. Throw a dodger + spoon (deep troll) or a flutter spoon until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Main-lake point (22 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Main-lake point (22 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Main-lake point (22 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 40 ft	dawn	Break off the point (44 ft)	Jigging spoon, Tube jig (white)

Notable structure

3 pieces of structure are mapped here — Deep basin, around 45 ft, is the deepest of them.

Deep basin: deep basin, around 45 ft
Break off the point: drop-off, around 44 ft
Main-lake point: point, around 22 ft

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

Check the official Montana fishing regulations →

Common questions

How deep is Surveyor Lake?

Surveyor Lake is about 45 ft (14 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 Surveyor Lake?

Anglers target cutthroat trout, rainbow trout on Surveyor Lake.

Where is the best fishing spot on Surveyor Lake?

Main-lake point is the top-rated area: a point in about 22 ft of water that rates prime for cutthroat trout in fall. The interactive chart above rates every spot for each species and season.

When is the best time to fish Surveyor 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 Surveyor Lake?

Fishing on Surveyor 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

Cedar Log Lake, South 4 mi · Cedar Log Lake, North 4 mi · Siamese Lake, Lower 8 mi · Siamese Lake, Upper 8 mi · Crater Lake 9 mi · Trio Lakes 12 mi · Pearl Lake 13 mi · French Lake 13 mi · Hidden Lake (Mineral) 13 mi · Hoodoo Lake 16 mi · Oregon Lake, Middle 22 mi · Bonanza Lake, Upper 26 mi

See how Surveyor Lake stacks up: best rainbow trout lakes in Montana · best cutthroat trout lakes in Montana

More water nearby: Mineral County fishing maps (19 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.