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22-acre lake in Carbon County, Montana. The lake tops out around 6 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 rest of this page walks each species through its year, using the map's own scoring.
There are 1.4 miles of drawn shoreline to work. An index of 2.8 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. The whole water is littoral — nothing here runs deeper than ~15 ft, so it's all weed-and-bait territory. Call it 0.4 mi long by 0.2 mi wide at the broadest reach. Carbon County claims this one. If the bite dies, Till Lake is 1 mi to the northwest.
When the water first warms, brook trout slide up into 1 to 6 ft. There's no big seasonal slide here — summer means 2 to 6 ft, winter 1 to 6 ft. Start at Deep basin. It's a deep basin holding about 6 ft of water and rates prime come summer. The feeding windows run early morning and the evening. Keep a small spoon fished deep or a trolled lake-clear wobbler + worm rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | dawn & dusk | Main-lake point (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 2 to 6 ft | dawn & dusk | Deep basin (6 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 1 to 6 ft | midday & dawn | Main-lake point (3 ft) | Small spoon (orange), Spinner |
| Winter | 1 to 6 ft | dawn | Deep basin (6 ft) | Small jigging spoon, Tungsten jig + plastic |
Come spring, look for rainbow trout tight to the bank in 2 to 6 ft. Through summer count on 2 to 6 ft; the winter hold is 1 to 6 ft. If you only fish one area, make it Break off the point: a drop-off around 4 ft that scores prime in winter. Best bite is early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 6 ft | dawn & dusk | Main-lake point (3 ft) | Inline spinner (silver), Small spoon |
| Summer | 2 to 6 ft | dawn & dusk | Break off the point (4 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 2 to 6 ft | dawn & dusk | Main-lake point (3 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 1 to 6 ft | dawn | Break off the point (4 ft) | Jigging spoon, Tube jig (white) |
Start shallow in spring: cutthroat trout sit in 1 to 6 ft that time of year. They don't go far with the seasons — 2 to 6 ft covers summer, 2 to 6 ft covers winter. The spot to know is Break off the point, a drop-off in about 4 ft of water that rates prime for cutthroat trout in summer. Warm-month bites cluster around early morning and the evening. Throw a trolled spoon (small) or an inline spinner until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | dawn & dusk | Main-lake point (3 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 2 to 6 ft | dawn & dusk | Break off the point (4 ft) | Trolled spoon (small), Inline spinner |
| Fall | 1 to 6 ft | dawn & dusk | Main-lake point (3 ft) | Casting spoon, Inline spinner |
| Winter | 2 to 6 ft | dawn | Break off the point (4 ft) | Small jigging spoon, Marabou jig |
The chart marks 3 structure features on Erratic Lake (Carbon); the deepest is Deep basin at about 6 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 Erratic Lake (Carbon) specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Erratic Lake (Carbon) is about 6 ft (2 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, rainbow trout, cutthroat trout on Erratic Lake (Carbon). This isn't a survey of the lake — none is on record for it — but an informed estimate from the species listed for the nearest surveyed lakes in the region, filtered to this lake's depth and habitat.
Break off the point is the top-rated area: a drop-off in about 4 ft of water that rates prime for cutthroat trout in summer. The interactive chart above rates every spot for each species and season.
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 Erratic 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.
Till Lake 1 mi · Castle Lake 1 mi · Big Butte Lake 2 mi · Crystal Lake (Carbon) 2 mi · Green Lake (Carbon) 2 mi · Lake Elaine (Carbon) 2 mi · Anchor Lake 2 mi · Flat Rock Lake 2 mi · Estelle Lake (Carbon) 2 mi · Desolation Lake 2 mi · Jordan Lake (Carbon) 2 mi · Farley Lake (Carbon) 2 mi
See how Erratic Lake (Carbon) stacks up: best rainbow trout lakes in Montana · best brook trout 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.