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Fishing Triangle Lake (Carbon): what the data says
12-acre lake near Montana. The lake tops out around 35 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. Here is how the season plays out for each species, straight from the data behind the map.
Walleye fishing at Triangle Lake (Carbon)
Spring walleye on Triangle Lake (Carbon) hold shallow, usually 4 to 15 ft. They move out to 15 to 35 ft in summer and finish the year down in 11 to 35 ft. The spot to know is Deep basin, a deep basin in about 33 ft of water that rates prime for walleye in winter. Plan around the evening and early morning in the warm months. Summer baits: a crawler harness on bottom bouncer or a deep crankbait (trolled) gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | 1/8 oz jig + minnow, Hair jig |
| Summer | 15 to 35 ft | dusk & dawn | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 11 to 35 ft | dusk & night | Jigging rap, Jig + big minnow |
| Winter | 11 to 35 ft | dusk & dawn | Jigging spoon + minnow head, Rattle bait |
Northern Pike fishing at Triangle Lake (Carbon)
Spring northern pike on Triangle Lake (Carbon) hold shallow, usually 2 to 8 ft. They move out to 8 to 20 ft in summer and finish the year down in 5 to 15 ft. Shallow bay flat is the standout, a weed flat at roughly 4 ft, rated prime for spring northern pike. Best bite is early morning and the evening. Tie on a bucktail or a weedless spoon over cabbage and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Tip-ups, Large jigging spoon |
Yellow Perch fishing at Triangle Lake (Carbon)
In spring, yellow perch run shallow here, mostly 3 to 12 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 15 to 35 ft. The spot to know is Shallow bay flat, a weed flat in about 4 ft of water that rates prime for yellow perch in spring. In summer the feeding windows fall in early morning. Summer baits: a drop-shot micro plastics or a small spoon tipped with worm gets it done.
| 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 Triangle Lake (Carbon)
In spring, smallmouth bass run shallow here, mostly 3 to 12 ft. They move out to 10 to 30 ft in summer and finish the year down in 11 to 35 ft. Deep basin is the standout, a deep basin at roughly 33 ft, rated good for winter smallmouth bass. Plan around early morning and the evening in the warm months. A drop shot (goby/minnow) or a ned rig covers the summer program.
| 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 | 11 to 35 ft | midday | Blade bait, Hair jig |
Rainbow Trout fishing at Triangle Lake (Carbon)
Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. They move out to 8 to 30 ft in summer and finish the year down in 7 to 35 ft. Deep basin is the standout, a deep basin at roughly 33 ft, rated prime for winter rainbow trout. In summer the feeding windows fall in early morning and the evening. Summer baits: a dodger + spoon (deep troll) or a flutter spoon gets it done.
| 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 | 7 to 35 ft | dawn | Jigging spoon, Tube jig (white) |
Lake Trout fishing at Triangle Lake (Carbon)
Start shallow in spring: lake trout sit in 9 to 35 ft that time of year. Summer fish stay in 11 to 35 ft, and winter fish hold in 9 to 35 ft. If you only fish one area, make it Deep basin: a deep basin around 33 ft that scores prime in summer. In summer the feeding windows fall in early morning. A white tube jig (deep) or a magnum spoon on downrigger covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 9 to 35 ft | dawn & dusk | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 11 to 35 ft | dawn | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 7 to 35 ft | dusk & dawn | Heavy casting spoon, Jigging rap over reefs |
| Winter | 9 to 35 ft | dawn | White tube jig, Airplane jig |
Triangle Lake (Carbon) also holds crappie (10 to 25 ft in summer), channel catfish (8 to 25 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Notable structure
- Deep basin: deep basin, around 33 ft
- Shallow bay flat: weed flat, around 4 ft
- Back-bay flat: weed flat, around 3 ft
Common questions
How deep is Triangle Lake (Carbon)?
Triangle Lake (Carbon) is about 35 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 Triangle Lake (Carbon)?
Anglers target smallmouth bass, walleye, northern pike, crappie, channel catfish, rainbow trout, yellow perch, lake trout on Triangle Lake (Carbon).
Where is the best fishing spot on Triangle Lake (Carbon)?
Deep basin is the top-rated area: a deep basin in about 33 ft of water that rates prime for walleye in winter. Open the map above to see every rated spot for each species and season.
When is the best time to fish Triangle Lake (Carbon)?
For walleye, 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.
Nearby waters
Albino Lake · Moon Lake · Shelf Lake · Sliderock Lake · Golden Lake · Black Canyon Lake
See how Triangle Lake (Carbon) stacks up: best smallmouth bass lakes in Montana · best walleye lakes in Montana · best northern pike lakes in Montana · best crappie 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.