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Fishing Ostle Reservoir: what the data says
27-acre reservoir near Montana. The lake tops out around 4 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.
Rainbow Trout fishing at Ostle Reservoir
Start shallow in spring: rainbow trout sit in 1 to 4 ft that time of year. Summer fish stay in 1 to 4 ft, and winter fish hold in 1 to 4 ft. The spot to know is Break off the point, a drop-off in about 4 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 | 1 to 4 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 1 to 4 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 1 to 4 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 1 to 4 ft | dawn | Jigging spoon, Tube jig (white) |
Muskellunge fishing at Ostle Reservoir
Spring muskellunge on Ostle Reservoir hold shallow, usually 1 to 4 ft. Summer fish stay in 1 to 4 ft, and winter fish hold in 1 to 4 ft. The spot to know is Break off the point, a drop-off in about 4 ft of water that rates prime for muskellunge in fall. In summer the feeding windows fall in the evening and early morning. Summer baits: a double-10 bucktail or a topwater (walk-the-dog / creeper) gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 1 to 4 ft | dusk | Smaller bucktail (#8 blades), 6" glide bait |
| Summer | 1 to 4 ft | dusk & dawn | Double-10 bucktail, Topwater (walk-the-dog / creeper) |
| Fall | 1 to 4 ft | midday & dusk | Big rubber (Bull Dawg style), 10"+ glide bait |
| Winter | 1 to 4 ft | midday | Large rubber, crawled slow |
Notable structure
- Deep basin: deep basin, around 4 ft
- Break off the point: drop-off, around 4 ft
- Main-lake point: point, around 2 ft
- Secondary point: point, around 2 ft
Common questions
How deep is Ostle Reservoir?
Ostle Reservoir is about 4 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 Ostle Reservoir?
Anglers target rainbow trout, muskellunge on Ostle Reservoir.
Where is the best fishing spot on Ostle Reservoir?
Break off the point is the top-rated area: a drop-off in about 4 ft of water that rates prime for muskellunge in fall. Open the map above to see every rated spot for each species and season.
When is the best time to fish Ostle 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
Tunnel Lake · Pishkun Reservoir · Split Rock Lake · Gibson Reservoir · Willow Creek Reservoir · Lake Frances
See how Ostle Reservoir stacks up: best rainbow trout lakes in Montana · best muskellunge 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.