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Rating depth structure for rainbow trout.
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152-acre reservoir near Franklin. The lake tops out around 13 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. Here's the year, species by species, as the scoring engine sees it.
The outline encloses 130 acres, worked by 2.9 miles of shoreline. With a 1.8 development index there's bank structure worth casting at, in moderation. All of it is shallow-zone water — under ~15 ft across the entire basin, so the food chain has the run of the place. End to end it runs roughly 1.1 mi, about 0.5 mi across. It sits in Franklin County. If the bite dies, Oneida Narrows Reservoir is 7 mi to the northeast.
Spring puts cutthroat trout in skinny water — 3 to 13 ft is the zone. Summer fish stay in 4 to 13 ft, and winter fish hold in 3 to 13 ft. Break off the point is the standout, a drop-off at roughly 6 ft, rated prime for summer cutthroat trout. Plan around early morning and the evening in the warm months. A trolled spoon (small) or an inline spinner covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 13 ft | dawn & dusk | Main-lake point (8 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 4 to 13 ft | dawn & dusk | Break off the point (6 ft) | Trolled spoon (small), Inline spinner |
| Fall | 3 to 13 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Inline spinner |
| Winter | 3 to 13 ft | dawn | Break off the point (6 ft) | Small jigging spoon, Marabou jig |
Spring brook trout on Treasureton Reservoir hold shallow, usually 2 to 13 ft. Depth-wise the year is flat: 4 to 13 ft in summer, 2 to 13 ft once it turns cold. The chart's best answer is Deep basin — deep basin, 11 ft, prime for summer. Prime time lands in early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 13 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 4 to 13 ft | dawn & dusk | Deep basin (11 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 13 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 2 to 13 ft | dawn | Deep basin (11 ft) | Small jigging spoon, Tungsten jig + plastic |
Early season rainbow trout use the shallows, holding in 3 to 13 ft. Even in summer they hold at 3 to 13 ft; winter keeps them in 3 to 13 ft. Put Break off the point first on the milk run — a drop-off near 6 ft that grades prime for 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 | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 13 ft | dawn & dusk | Main-lake point (8 ft) | Inline spinner (silver), Small spoon |
| Summer | 3 to 13 ft | dawn & dusk | Break off the point (6 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 4 to 13 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 3 to 13 ft | dawn | Break off the point (6 ft) | Jigging spoon, Tube jig (white) |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 11 ft.
| Date | Species | Count | Size |
|---|---|---|---|
| Jun 18 | Cutbow - Cutthroat x Rainbow Trout | — | ~1.5" |
| May 20 | Rainbow Trout | — | ~4.5" |
| Oct 20, 2025 | Rainbow Trout | — | ~13" |
Source: Idaho Fish & Game stocking records, retrieved 2026-09-03.
Season dates, license requirements, and size and bag limits for Idaho waters are set by the Idaho Fish and Game — and special regulations can apply to Treasureton Reservoir specifically, so confirm the current rules before you fish.
Check the official Idaho fishing regulations →
Treasureton Reservoir is about 13 ft (4 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target cutthroat trout, brook trout, rainbow trout on Treasureton Reservoir.
Break off the point is the top-rated area: a drop-off in about 6 ft of water that rates prime for cutthroat trout in summer. The interactive chart above rates every spot for each 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.
Yes — per Idaho Fish & Game stocking records records, Treasureton Reservoir was most recently stocked Jun 18 with cutbow - cutthroat x rainbow trout. The full stocking history is listed above.
Fishing on Treasureton Reservoir is regulated by the Idaho Fish and Game. Check the official Idaho regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Oneida Narrows Reservoir 7 mi · Foster Reservoir 8 mi · Lamont Reservoir 9 mi · Newton Reservoir 24 mi, UT · Bear Lake 32 mi, UT/ID · Hyrum Reservoir 43 mi, UT · Stone Reservoir 44 mi · Chesterfield Reservoir 46 mi · Porcupine Reservoir 50 mi, UT · Mantua Reservoir 51 mi, UT · Birch Creek Reservoir 57 mi, UT · Alice Lake 58 mi, WY
See how Treasureton Reservoir stacks up: best rainbow trout lakes in Idaho · best brook trout lakes in Idaho · best cutthroat trout lakes in Idaho
Browse all Idaho fishing maps or see every water on DepthScout. 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.