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Fishing First Rock Lake: what the data says
10-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.
Brook Trout fishing at First Rock Lake
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. By summer they slide out to 10 to 30 ft, and by winter most fish are in 3 to 20 ft. If you only fish one area, make it Break off the point: a drop-off around 19 ft that scores prime in summer. In summer the feeding windows fall in early morning and the evening. A small spoon fished deep or a trolled lake-clear wobbler + worm covers the summer program.
| 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 |
Cutthroat Trout fishing at First Rock Lake
Spring cutthroat trout on First Rock Lake hold shallow, usually 3 to 15 ft. They move out to 10 to 35 ft in summer and finish the year down in 9 to 35 ft. The spot to know is Break off the point, a drop-off in about 19 ft of water that rates prime for cutthroat trout in summer. Best bite is early morning and the evening. Tie on a trolled spoon (small) or a inline spinner and you're in the game.
| 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 | 9 to 35 ft | dawn | Small jigging spoon, Marabou jig |
Notable structure
- Deep basin: deep basin, around 34 ft
- Break off the point: drop-off, around 19 ft
- Main-lake point: point, around 4 ft
Common questions
How deep is First Rock Lake?
First Rock Lake 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 First Rock Lake?
Anglers target brook trout, cutthroat trout on First Rock Lake.
Where is the best fishing spot on First Rock Lake?
Break off the point is the top-rated area: a drop-off in about 19 ft of water that rates prime for cutthroat trout in summer. Open the map above to see every rated spot for each species and season.
When is the best time to fish First Rock Lake?
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
September Morn Lake · Second Rock Lake · Black Canyon Lake · Lost Lake (Carbon) · Moon Lake · Ship Lake
See how First Rock Lake stacks up: best brook trout 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.