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17-acre lake in Stillwater County, Montana. The lake tops out around 50 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. Every species below gets its seasonal read from the same numbers driving the chart.
Shoreline on the chart totals 1.2 miles. Nearly circular (index 1.4), so the story is the bottom, not the bank. About 38% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. End to end it runs roughly 0.5 mi, about 0.2 mi across. You'll find it in Stillwater County. For a second option, Lightning Lake lies 2 mi southwest.
Early season cutthroat trout use the shallows, holding in 3 to 15 ft. Expect a summer slide to 10 to 35 ft, then a winter hold in 10 to 40 ft. Put Break off the point first on the milk run — a drop-off near 27 ft that grades prime for summer. In summer the feeding windows fall in early morning and the evening. Tie on a trolled spoon (small) or an inline spinner and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Main-lake point (7 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Break off the point (27 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (7 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Break off the point (27 ft) | Small jigging spoon, Marabou jig |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 50 ft.
Season dates, license requirements, and size and bag limits for Montana waters are set by the Montana Fish, Wildlife & Parks — and special regulations can apply to Jasper Lake (Tumble Lake) specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Jasper Lake (Tumble Lake) is about 50 ft (15 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target cutthroat trout on Jasper Lake (Tumble Lake).
Break off the point is the top-rated area: a drop-off in about 27 ft of water that rates prime for cutthroat trout in summer. Scroll up to the map for the complete spot list by species and season.
For cutthroat 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.
Fishing on Jasper Lake (Tumble Lake) is regulated by the Montana Fish, Wildlife & Parks. Check the official Montana regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Lightning Lake 2 mi · Lake Surrender 3 mi · Cimmerian Lake 4 mi · Wounded Man Lake 6 mi · Owl Lake (Sweet Grass) 6 mi · Narrow Escape Lake 6 mi · Sienna Lake 6 mi · Rainbow Lake, Upper (Rainbow #2) 7 mi · Mirror Lake 7 mi · Fish Lake (Sweet Grass) 7 mi · Jordan Lake (Sweet Grass) 8 mi · Cataract Lake 8 mi
See how Jasper Lake (Tumble Lake) stacks up: best cutthroat trout lakes in Montana
More water nearby: Stillwater County fishing maps (8 charts). Browse all Montana fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.