Sign inSign up free Sign inSign up free Sign inSign up freeShared by DepthScout anglers. Exact spots stay private, always.
39-acre lake in Carbon County, Montana. The lake tops out around 80 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.
The drawn water covers 47 acres wrapped in 1.5 miles of bank. A middling shoreline index (1.6) gives it some bays to work without being a maze. 13% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Figure 0.5 mi of water from one end to the other, 0.2 mi at the beam. It sits in Carbon County. If the bite dies, Medicine Lake is 1 mi to the northwest.
The spring pattern is a shallow one: cutthroat trout in 3 to 15 ft. Midsummer fish sit out in 10 to 35 ft before dropping to 10 to 40 ft for winter. The spot to know is Main-lake point, a point in about 16 ft of water that rates prime for cutthroat trout in fall. Plan around early morning and the evening in the warm months. Summer baits: a trolled spoon (small) or an inline spinner gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Main-lake point (16 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Main-lake point (16 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (16 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Main-lake point (16 ft) | Small jigging spoon, Marabou jig |
Count 5 structure marks on this chart. The deepest, Deep basin, sits near 80 ft.
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 Dewey Lake specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Dewey Lake is about 80 ft (24 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 cutthroat trout on Dewey Lake.
Main-lake point is the top-rated area: a point in about 16 ft of water that rates prime for cutthroat trout in fall. Open the map above to see every rated spot for each species and season.
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.
Fishing on Dewey 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.
Medicine Lake 1 mi · Vogel Lake 1 mi · Echo Lake (Carbon) 2 mi · Fossil Lake (Carbon) 2 mi · Martin Lake (Carbon) 2 mi · Cairn Lake 2 mi · Stephanie Lake 3 mi · Bergschrund Lake 3 mi · Lake At Falls 3 mi · Fizzle Lake (Windy Lake/Dead Horse Lake) 3 mi · Lake Of The Clouds 3 mi · Lake Of The Winds 3 mi
See how Dewey Lake stacks up: best cutthroat trout lakes in Montana
More water nearby: Carbon County fishing maps (65 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.