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Fishing Gibson Reservoir: what the data says
3,070-acre reservoir near Montana. The lake tops out around 165 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.
Brook Trout fishing at Gibson Reservoir
Spring brook trout on Gibson Reservoir hold shallow, usually 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. The spot to know is Main-lake point, a point in about 7 ft of water that rates prime for brook trout in spring. Plan around early morning and the evening in the warm months. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Small jigging spoon, Tungsten jig + plastic |
Arctic Grayling fishing at Gibson Reservoir
Spring arctic grayling on Gibson Reservoir hold shallow, usually 2 to 10 ft. By summer they slide out to 3 to 15 ft, and by winter most fish are in 8 to 25 ft. The spot to know is Rock reef, a rock pile in about 2 ft of water that rates prime for arctic grayling in spring. Best bite is the evening and early morning. Summer baits: a dry fly (parachute adams, elk hair caddis) or a small inline spinner gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 10 ft | midday & dusk | 1/16 oz spinner (silver), Small dry fly (Adams, Griffith's) |
| Summer | 3 to 15 ft | dusk & dawn | Dry fly (parachute Adams, elk hair caddis), Small inline spinner |
| Fall | 6 to 20 ft | midday | Small spoon, Beadhead nymph under indicator |
| Winter | 8 to 25 ft | midday & dawn | Tungsten jig + waxworm, Small jigging spoon (gold) |
Cutthroat Trout fishing at Gibson Reservoir
Start shallow in spring: cutthroat trout sit in 3 to 15 ft that time of year. Summer pushes them deeper, 10 to 35 ft, and winter fish settle into 10 to 40 ft. If you only fish one area, make it Main-lake point: a point around 7 ft that scores prime in fall. Best bite is early morning and the evening. A trolled spoon (small) or a inline spinner covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Small jigging spoon, Marabou jig |
Rainbow Trout fishing at Gibson Reservoir
In spring, rainbow trout run shallow here, mostly 5 to 20 ft. By summer they slide out to 8 to 30 ft, and by winter most fish are in 8 to 40 ft. Main-lake point is the standout, a point at roughly 7 ft, rated prime for spring rainbow trout. In summer the feeding windows fall in 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) |
Notable structure
- Deep basin: deep basin, around 159 ft
- Feeding flat: feeding flat, around 43 ft
- Feeding flat: feeding flat, around 43 ft
- Feeding flat: feeding flat, around 43 ft
- Shallow bay flat: weed flat, around 8 ft
- Main-lake point: point, around 7 ft
- Secondary point: point, around 5 ft
- Back-bay flat: weed flat, around 5 ft
- Weed flat: weed flat, around 5 ft
- Break off the point: drop-off, around 4 ft
- Rock reef: rock pile, around 2 ft
Common questions
How deep is Gibson Reservoir?
Gibson Reservoir is about 165 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 Gibson Reservoir?
Anglers target rainbow trout, brook trout, arctic grayling, cutthroat trout on Gibson Reservoir.
Where is the best fishing spot on Gibson Reservoir?
Rock reef is the top-rated area: a rock pile in about 2 ft of water that rates prime for arctic grayling in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Gibson Reservoir?
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.
Nearby waters
Tunnel Lake · Split Rock Lake · Pishkun Reservoir · Willow Creek Reservoir · Ostle Reservoir · Parker Lake
See how Gibson Reservoir stacks up: best rainbow trout lakes in Montana · best brook trout lakes in Montana · best arctic grayling lakes in Montana · best cutthroat trout 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.