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45-acre reservoir in Beaverhead County, Montana. The lake tops out around 50 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 season-by-season read for each species follows, from the map's own numbers.
Traced from the shoreline, Reservoir Lake runs 40 acres with 1.3 miles of edge. A shoreline index of 1.4 says round and simple: fish relate to depth changes here, not shoreline features. About 24% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Tip to tip the water measures near 0.5 mi with a 0.2-mi widest point. The water lies in Beaverhead County. For a second option, Van Houten Lake lies 8 mi north.
The spring pattern is a shallow one: brook trout in 2 to 15 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 3 to 20 ft for winter. The spot to know is Break off the point, a drop-off in about 31 ft of water that rates prime for brook trout in summer. Plan around early morning and the evening in the warm months. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (10 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (31 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (10 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (7 ft) | Small jigging spoon, Tungsten jig + plastic |
Spring cutthroat trout on Reservoir Lake hold shallow, usually 3 to 15 ft. They move out to 10 to 35 ft in summer and finish the year down in 10 to 40 ft. Put Break off the point first on the milk run — a drop-off near 31 ft that grades prime for summer. The feeding windows run 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 | Main-lake point (10 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Break off the point (31 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (10 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Break off the point (31 ft) | Small jigging spoon, Marabou jig |
5 pieces of structure are mapped here — Deep basin, around 50 ft, is the deepest of them.
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 Reservoir Lake specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Reservoir Lake is about 50 ft (15 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target brook trout, cutthroat trout on Reservoir Lake.
Break off the point is the top-rated area: a drop-off in about 31 ft of water that rates prime for cutthroat trout in summer. Every other rated spot, per species and season, is on the map above.
For brook 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.
Fishing on Reservoir 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.
Van Houten Lake 8 mi · Lower Miner Lakes 15 mi · Twin Lakes (Beaverhead) 23 mi · Bear Lake (Beaverhead) 28 mi · Kelly Reservioir 29 mi · Sawtooth Lake 30 mi · Clark Canyon Reservoir 30 mi · Minneopa Lake 30 mi · Deerhead Lake 34 mi · Baldy Lake 34 mi · Lily Lake (Beaverhead) 35 mi · Sand Lake 35 mi
See how Reservoir Lake stacks up: best brook trout lakes in Montana · best cutthroat trout 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.