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Fishing Rock Lake: what the data says
34-acre lake near Montana. The lake tops out around 30 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. What follows comes from the same scoring engine that paints the spots above.
Rainbow Trout fishing at Rock Lake
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 6 to 30 ft. If you only fish one area, make it Break off the point: a drop-off around 24 ft that scores prime in winter. Plan around early morning and the evening in the warm months. 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 | 9 to 30 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 6 to 30 ft | dawn | Jigging spoon, Tube jig (white) |
Yellow Perch fishing at Rock Lake
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 9 to 30 ft. If you only fish one area, make it Deep basin: a deep basin around 30 ft that scores prime in fall. Plan around early morning in the warm months. 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 | 10 to 30 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 9 to 30 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 9 to 30 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Smallmouth Bass fishing at Rock Lake
Spring smallmouth bass on Rock Lake hold shallow, usually 3 to 12 ft. They move out to 10 to 30 ft in summer and finish the year down in 9 to 30 ft. The spot to know is Break off the point, a drop-off in about 24 ft of water that rates prime for smallmouth bass in winter. Plan around early morning and the evening in the warm months. 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 | 9 to 30 ft | midday | Blade bait, Hair jig |
Notable structure
- Deep basin: deep basin, around 30 ft
- Break off the point: drop-off, around 24 ft
- Main-lake point: point, around 6 ft
- Shallow bay flat: weed flat, around 2 ft
Common questions
How deep is Rock Lake?
Rock Lake is about 30 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 Rock Lake?
Anglers target smallmouth bass, rainbow trout, yellow perch on Rock Lake.
Where is the best fishing spot on Rock Lake?
Deep basin is the top-rated area: a deep basin in about 30 ft of water that rates prime for yellow perch in fall. Open the map above to see every rated spot for each species and season.
When is the best time to fish Rock Lake?
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
Long Lake (Lincoln) · Frank Lake · Glen Lake · Tetrault Lake · Moran Lake · Little Therriault Lake
See how Rock Lake 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.