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Box Canyon to Ashton. The world's most famous dry-fly rainbow water. The river tops out around 8 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. The rest of this page walks each species through its year, using the map's own scoring.
The outline encloses 1,597 acres, worked by 84.9 miles of shoreline — 2 islands included. A development index of 15.2 means a maze of bays and points: far more casting targets than a round bowl of the same size. The whole water is littoral — nothing here runs deeper than ~15 ft, so it's all weed-and-bait territory. Call it 22 mi long by 9.1 mi wide at the broadest reach. Fremont County claims this one. Ashton Reservoir sits 12 mi southwest — the closest neighbouring chart.
Come spring, look for rainbow trout tight to the bank in 2 to 8 ft. Through summer count on 2 to 8 ft; the winter hold is 2 to 8 ft. If you only fish one area, make it Current seam (mile 18.6): a current seam around 4 ft that scores prime in spring. Best bite is 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 | 2 to 8 ft | dawn & dusk | Current seam (mile 18.6) (4 ft) | Inline spinner (silver), Small spoon |
| Summer | 2 to 8 ft | dawn & dusk | Current seam (mile 18.6) (4 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 2 to 8 ft | dawn & dusk | Current seam (mile 18.6) (4 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 2 to 8 ft | dawn | Current seam (mile 18.6) (4 ft) | Jigging spoon, Tube jig (white) |
Start shallow in spring: brown trout sit in 1 to 8 ft that time of year. They don't go far with the seasons — 2 to 8 ft covers summer, 1 to 8 ft covers winter. The spot to know is Current seam (mile 18.6), a current seam in about 4 ft of water that rates prime for brown trout in summer. Warm-month bites cluster around after dark and early morning. Throw a spoon at the thermocline or a deep stickbait (night) until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 8 ft | dawn & dusk | Island Park Dam tailrace (7 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 2 to 8 ft | night & dawn | Current seam (mile 18.6) (4 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 1 to 8 ft | dusk & dawn | Island Park Dam tailrace (7 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 1 to 8 ft | dawn | Island Park Dam tailrace (7 ft) | Jigging spoon, Small stickbait (slow) |
Henrys Fork carries 30 mapped structure features, topping out (or rather bottoming out) at Island Park Dam tailrace, about 7 ft down.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
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 Henrys Fork specifically, so confirm the current rules before you fish.
Check the official Idaho fishing regulations →
Henrys Fork is about 8 ft (2 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, brown trout on Henrys Fork.
Current seam (mile 18.6) is the top-rated area: a current seam in about 4 ft of water that rates prime for rainbow trout in spring. Every other rated spot, per species and season, is on the map above.
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.
Fishing on Henrys Fork 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.
Ashton Reservoir 12 mi · Fish Lake 24 mi, WY · Henrys Lake 26 mi · Tillery Lake 29 mi, WY · Red Rock Lake, Upper 30 mi, MT · Widgeon Pond 30 mi, MT · Grassy Lake Reservoir 30 mi, WY · Elk Lake (Beaverhead) 31 mi, MT · Feather Lake 33 mi, WY · Hidden Lake (Madison) 34 mi, MT · Lewis Lake 37 mi, WY · Hebgen Lake 38 mi, MT
See how Henrys Fork stacks up: best rainbow trout lakes in Idaho · best brown 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.