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Fishing Rainbow Lake (Carbon): what the data says
88-acre lake near Montana. The lake tops out around 180 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. Below is the species-by-species picture, pulled from the same data the map uses.
Rainbow Trout fishing at Rainbow Lake (Carbon)
Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. By summer they slide out to 8 to 30 ft, and by winter most fish are in 8 to 40 ft. Whirlpool Creek inflow is the standout, a inflow / creek mouth at roughly 30 ft, rated prime for summer rainbow trout. Best bite is early morning and the evening. Tie on a dodger + spoon (deep troll) or a flutter spoon and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Jigging spoon, Tube jig (white) |
Yellow Perch fishing at Rainbow Lake (Carbon)
Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. They move out to 10 to 30 ft in summer and finish the year down in 15 to 35 ft. Shallow bay flat is the standout, a weed flat at roughly 15 ft, rated prime for summer yellow perch. Plan around early morning in the warm months. Tie on a drop-shot micro plastics or a small spoon tipped with worm and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Smallmouth Bass fishing at Rainbow Lake (Carbon)
Start shallow in spring: smallmouth bass sit in 3 to 12 ft that time of year. By summer they slide out to 10 to 30 ft, and by winter most fish are in 20 to 45 ft. Main-lake point is the standout, a point at roughly 26 ft, rated prime for fall smallmouth bass. Best bite is early morning and the evening. Summer baits: a drop shot (goby/minnow) or a ned rig gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Ned rig, Tube jig |
| Summer | 10 to 30 ft | dawn & dusk | Drop shot (goby/minnow), Ned rig |
| Fall | 8 to 25 ft | midday & dawn | Jerkbait, Blade bait |
| Winter | 20 to 45 ft | midday | Blade bait, Hair jig |
Notable structure
- Deep basin: deep basin, around 178 ft
- Break off the point: drop-off, around 95 ft
- Old creek channel: creek channel, around 48 ft
- Whirlpool Creek inflow: inflow / creek mouth, around 30 ft
- Secondary point: point, around 27 ft
- Main-lake point: point, around 26 ft
- Back-bay flat: weed flat, around 21 ft
- Shallow bay flat: weed flat, around 15 ft
Common questions
How deep is Rainbow Lake (Carbon)?
Rainbow Lake (Carbon) is about 180 ft 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 Rainbow Lake (Carbon)?
Anglers target smallmouth bass, rainbow trout, yellow perch on Rainbow Lake (Carbon).
Where is the best fishing spot on Rainbow Lake (Carbon)?
Whirlpool Creek inflow is the top-rated area: a inflow / creek mouth in about 30 ft of water that rates prime for rainbow trout in summer. Open the map above to see every rated spot for each species and season.
When is the best time to fish Rainbow Lake (Carbon)?
For rainbow 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.
Nearby waters
Rimrock Lake · Lake At Falls · Martin Lake (Carbon) · Summit Lake (Carbon) · Arch Lake · Bergschrund Lake
See how Rainbow Lake (Carbon) stacks up: best smallmouth bass lakes in Montana · best rainbow trout lakes in Montana · best yellow perch lakes in Montana
Browse all Montana fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.