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Rating depth structure for rainbow trout.
Shared by DepthScout anglers. Exact spots stay private, always.
232-acre reservoir near Gem. The lake tops out around 27 ft. This chart interpolates between a real shoreline and a known maximum depth. It will point you at likely water, but it is not a navigation product. Below is the species-by-species picture, pulled from the same data the map uses.
Sage Hen Reservoir maps at 230 acres behind 3.5 miles of shoreline. A middling shoreline index (1.7) gives it some bays to work without being a maze. 71% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. The basin spans about 1.2 mi end to end and 0.7 mi across at its widest. It sits in Gem County. Cascade Reservoir sits 20 mi north — the closest neighbouring chart.
Come spring, look for rainbow trout tight to the bank in 5 to 20 ft. Expect a summer slide to 7 to 27 ft, then a winter hold in 5 to 27 ft. Start at Break off the point. It's a drop-off holding about 12 ft of water and rates prime come winter. Prime time lands in early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (8 ft) | Inline spinner (silver), Small spoon |
| Summer | 7 to 27 ft | dawn & dusk | Break off the point (12 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 8 to 27 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 5 to 27 ft | dawn | Break off the point (12 ft) | Jigging spoon, Tube jig (white) |
Sage Hen Reservoir carries 7 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 23 ft down.
| Date | Species | Count | Size |
|---|---|---|---|
| Jul 1 | Rainbow Trout | — | ~13" |
| Jun 8 | Rainbow Trout | — | ~13" |
| May 13 | 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 Sage Hen Reservoir specifically, so confirm the current rules before you fish.
Check the official Idaho fishing regulations →
Sage Hen Reservoir is about 27 ft (8 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 rainbow trout on Sage Hen Reservoir.
Break off the point is the top-rated area: a drop-off in about 12 ft of water that rates prime for rainbow trout in winter. The interactive chart above rates every spot for each species and season.
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.
Yes — per Idaho Fish & Game stocking records records, Sage Hen Reservoir was most recently stocked Jul 1 with rainbow trout. The full stocking history is listed above.
Fishing on Sage Hen 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.
Cascade Reservoir 20 mi · Deadwood Reservoir 26 mi · Mann Creek Reservoir 36 mi · Payette Lake 41 mi · Hornet Reservoir 42 mi · Blackwell Lake 45 mi · Bull Trout Lake 46 mi · Lost Valley Reservoir 46 mi · Brownlee Reservoir 47 mi, ID/OR · Goose Lake 52 mi · Cape Horn Lake #1 52 mi · Lucky Peak Lake 53 mi
See how Sage Hen Reservoir stacks up: best rainbow 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.