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10-acre lake in Carbon County, Montana. The lake tops out around 25 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. Species by species, here's what the data says the year looks like.
The chart traces 0.9 miles of shoreline here. A middling shoreline index (1.7) gives it some bays to work without being a maze. About 86% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. End to end it runs roughly 0.4 mi. It sits in Carbon County. Its nearest charted neighbour, Black Canyon Lake, is 2 mi to the southwest.
Come spring, look for arctic grayling tight to the bank in 2 to 10 ft. Expect a summer slide to 3 to 15 ft, then a winter hold in 8 to 25 ft. Start at Deep basin. It's a deep basin holding about 24 ft of water and rates prime come winter. Prime time lands in the evening and early morning. A dry fly (parachute adams, elk hair caddis) or a small inline spinner is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dusk | Shallow bay flat (3 ft) | 1/16 oz spinner (silver), Small dry fly (Adams, Griffith's) |
| Summer | 3 to 15 ft | dusk & dawn | Break off the point (5 ft) | Dry fly (parachute Adams, elk hair caddis), Small inline spinner |
| Fall | 6 to 20 ft | midday | Break off the point (5 ft) | Small spoon, Beadhead nymph under indicator |
| Winter | 8 to 25 ft | midday & dawn | Deep basin (24 ft) | Tungsten jig + waxworm, Small jigging spoon (gold) |
The spring pattern is a shallow one: cutthroat trout in 3 to 15 ft. Midsummer fish sit out in 7 to 25 ft before dropping to 6 to 25 ft for winter. The spot to know is Break off the point, a drop-off in about 5 ft of water that rates prime for cutthroat trout in summer. 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 (3 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 7 to 25 ft | dawn & dusk | Break off the point (5 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (3 ft) | Casting spoon, Inline spinner |
| Winter | 6 to 25 ft | dawn | Break off the point (5 ft) | Small jigging spoon, Marabou jig |
4 pieces of structure are mapped here — Deep basin, around 24 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 Lost Lake (Carbon) specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Lost Lake (Carbon) is about 25 ft (8 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 arctic grayling, cutthroat trout on Lost Lake (Carbon).
Deep basin is the top-rated area: a deep basin in about 24 ft of water that rates prime for arctic grayling in winter. The interactive chart above rates every spot for each species and season.
For arctic grayling, 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.
Fishing on Lost Lake (Carbon) 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.
Black Canyon Lake 2 mi · First Rock Lake 2 mi · September Morn Lake 2 mi · Crescent Lake (Hellroaring Lake #8) 3 mi · Sliderock Lake 3 mi · Second Rock Lake 3 mi · Moon Lake 3 mi · Shelf Lake 4 mi · Timberline Lake 4 mi · Triangle Lake (Carbon) 5 mi · Ship Lake 5 mi · Two Bits Lake 5 mi
See how Lost Lake (Carbon) stacks up: best arctic grayling lakes in Montana · 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.