Spar 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 Spar 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 Spar Lake on the board.

Fishing Spar Lake: what the data says

286-acre lake in Lincoln County, Montana. The lake tops out around 200 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 286 acres wrapped in 2.7 miles of bank. At index 1.1 the outline is almost a bowl — read the depth changes, not the shoreline. Littoral water — the productive band under ~15 ft — makes up 1% of this chart. Tip to tip the water measures near 1.1 mi with a 0.6-mi widest point. It sits in Lincoln County. Bull Lake (Lincoln) sits 4 mi east — the closest neighbouring chart.

Lake Trout fishing at Spar Lake

When the water first warms, lake trout slide up into 10 to 40 ft. By summer they slide out to 50 to 120 ft, and by winter most fish are in 20 to 80 ft. If you only fish one area, make it Main-lake point: a point around 21 ft that scores prime in spring. In summer the feeding windows fall in early morning. Keep a white tube jig (deep) or a magnum spoon on downrigger rigged through the warm months.

Season	Depth	Best window	Start at	Go-to baits
Spring	10 to 40 ft	dawn & dusk	Main-lake point (21 ft)	Casting spoon over shoals, Jerkbait (shallow)
Summer	50 to 120 ft	dawn	Deep basin (200 ft)	White tube jig (deep), Magnum spoon on downrigger
Fall	10 to 50 ft	dusk & dawn	Main-lake point (21 ft)	Heavy casting spoon, Jigging rap over reefs
Winter	20 to 80 ft	dawn	Deep basin (200 ft)	White tube jig, Airplane jig

Kokanee fishing at Spar Lake

Early season kokanee use the shallows, holding in 10 to 30 ft. Expect a summer slide to 30 to 70 ft, then a winter hold in 20 to 80 ft. Put Deep basin first on the milk run — a deep basin near 200 ft that grades good for spring. In summer the feeding windows fall in early morning. Tie on a dodger + pink/orange squid on downrigger or a kokanee bug + corn and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	10 to 30 ft	dawn	Deep basin (200 ft)	Small dodger + squid (pink), Wedding-ring spinner + corn
Summer	30 to 70 ft	dawn	Deep basin (200 ft)	Dodger + pink/orange squid on downrigger, Kokanee bug + corn
Fall	5 to 40 ft	dawn	open water	Dodger + squid (deeper red/purple), Small spoon
Winter	20 to 80 ft	dawn	Deep basin (200 ft)	Small glow jig + corn or maggot, Tiny spoon

Brook Trout fishing at Spar Lake

Early season brook trout use the shallows, holding in 2 to 15 ft. Expect a summer slide to 10 to 30 ft, then a winter hold in 3 to 20 ft. Put Back-bay flat first on the milk run — a feeding flat near 22 ft that grades good for winter. In summer the feeding windows fall in early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 15 ft	dawn & dusk	open water	Small inline spinner (gold), Tiny spoon
Summer	10 to 30 ft	dawn & dusk	open water	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	2 to 15 ft	midday & dawn	open water	Small spoon (orange), Spinner
Winter	3 to 20 ft	dawn	Back-bay flat (22 ft)	Small jigging spoon, Tungsten jig + plastic

Cutthroat Trout fishing at Spar 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 21 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	open water	Inline spinner (silver/gold), Small spoon
Summer	10 to 35 ft	dawn & dusk	Main-lake point (21 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (21 ft)	Casting spoon, Inline spinner
Winter	10 to 40 ft	dawn	Main-lake point (21 ft)	Small jigging spoon, Marabou jig

Rainbow Trout fishing at Spar Lake

Spring rainbow trout on Spar Lake hold shallow, usually 5 to 20 ft. By summer they slide out to 8 to 30 ft, and by winter most fish are in 8 to 40 ft. The chart's best answer is Main-lake point — point, 21 ft, prime for fall. Prime time lands in early morning and the evening. The summer box starts with a dodger + spoon (deep troll) or a flutter spoon.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Main-lake point (21 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Main-lake point (21 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Main-lake point (21 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 40 ft	dawn	Break off the point (160 ft)	Jigging spoon, Tube jig (white)

Notable structure

5 pieces of structure are mapped here — Deep basin, around 200 ft, is the deepest of them.

Deep basin: deep basin, around 200 ft
Break off the point: drop-off, around 160 ft
Shallow bay flat: feeding flat, around 23 ft
Back-bay flat: feeding flat, around 22 ft
Main-lake point: point, around 21 ft

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

Check the official Montana fishing regulations →

Common questions

How deep is Spar Lake?

Spar Lake is about 200 ft (61 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 Spar Lake?

Anglers target lake trout, kokanee, brook trout, cutthroat trout, rainbow trout on Spar Lake.

Where is the best fishing spot on Spar Lake?

Main-lake point is the top-rated area: a point in about 21 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 Spar Lake?

For lake trout, the summer bite is best in 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 Spar Lake?

Fishing on Spar 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

Bull Lake (Lincoln) 4 mi · Savage Lake 12 mi · Antelope Lake 13 mi, ID · Kootenai River 21 mi · Kilbrennan Lake 23 mi · Lake Pend Oreille 23 mi, ID · Loon Lake (Lincoln) 26 mi · Shepherd Lake 28 mi, ID · Round Lake 33 mi, ID · Perkins Lake 35 mi, ID · Little Loon Lake 37 mi · Leon Lake 37 mi

See how Spar Lake stacks up: best rainbow trout lakes in Montana · best lake trout lakes in Montana · best brook trout lakes in Montana · best kokanee 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.