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Fishing Gollaher Reservoir: what the data says
40-acre reservoir near Montana. The lake tops out around 18 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 Gollaher Reservoir
Start shallow in spring: rainbow trout sit in 5 to 18 ft that time of year. Summer fish stay in 5 to 18 ft, and winter fish hold in 4 to 18 ft. The spot to know is Break off the point, a drop-off in about 5 ft of water that rates prime for rainbow trout in winter. 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 18 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 5 to 18 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 5 to 18 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 4 to 18 ft | dawn | Jigging spoon, Tube jig (white) |
Yellow Perch fishing at Gollaher Reservoir
In spring, yellow perch run shallow here, mostly 3 to 12 ft. Summer pushes them deeper, 5 to 18 ft, and winter fish settle into 5 to 18 ft. Shallow bay flat is the standout, a weed flat at roughly 6 ft, rated prime for spring yellow perch. Best bite is early morning. A drop-shot micro plastics or a small spoon tipped with worm covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 5 to 18 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 5 to 18 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 5 to 18 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Smallmouth Bass fishing at Gollaher Reservoir
In spring, smallmouth bass run shallow here, mostly 3 to 12 ft. Summer pushes them deeper, 5 to 18 ft, and winter fish settle into 5 to 18 ft. Break off the point is the standout, a drop-off at roughly 5 ft, rated prime for winter smallmouth bass. Best bite is early morning and the evening. Tie on a drop shot (goby/minnow) or a ned rig and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Ned rig, Tube jig |
| Summer | 5 to 18 ft | dawn & dusk | Drop shot (goby/minnow), Ned rig |
| Fall | 5 to 18 ft | midday & dawn | Jerkbait, Blade bait |
| Winter | 5 to 18 ft | midday | Blade bait, Hair jig |
Notable structure
- Deep basin: deep basin, around 18 ft
- Shallow bay flat: weed flat, around 6 ft
- Break off the point: drop-off, around 5 ft
- Main-lake point: point, around 3 ft
Common questions
How deep is Gollaher Reservoir?
Gollaher Reservoir is about 18 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 Gollaher Reservoir?
Anglers target smallmouth bass, rainbow trout, yellow perch on Gollaher Reservoir.
Where is the best fishing spot on Gollaher Reservoir?
Shallow bay flat is the top-rated area: a weed flat in about 6 ft of water that rates prime for yellow perch in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Gollaher Reservoir?
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
Missouri River · Hound Creek Reservoir · Lewis Pond South · Wadsworth Lake · Hauser Lake · Lake Helena
See how Gollaher Reservoir 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.