What special fishing regulations apply at Henry's Fork of the Snake River?

Henry's Fork of the Snake River carries 2 special-regulation overlays that override Idaho's statewide 2026 rules, covering Rainbow trout. One of them reads: "Catch-and-release-only on Harriman State Park 'Railroad Ranch' fly-fishing-only reach; trout 6 / day combined elsewhere with 16-20 in min on Box Canyon + Last Chance quality-management reaches; rainbow trout self-sustaining wild fishery; one of country's premier dry-fly + technical-nymphing trout fisheries; IDFG Henrys Lake State Fish Hatchery facility upstream at Henrys Lake." Every overlay on this water body is listed in full above.

Do I need a fishing license to fish Henry's Fork of the Snake River?

Yes. Henry's Fork of the Snake River is in Idaho, so a valid Idaho fishing license is required just as it is anywhere else in the state, issued by Idaho Department of Fish and Game (IDFG). The special regulations on this page change the bag, size, slot, or gear rules for Henrys Fork; they do not waive the license requirement. Free-fishing days and youth exemptions follow the statewide Idaho rules.

Do Henry's Fork of the Snake River's special rules replace Idaho's statewide limits?

Only where they conflict. Idaho's statewide 2026 regulations apply on Henrys Fork by default; the overlays above replace the matching statewide rules for the species or gear they name, while everything not specifically overridden still follows the statewide rule. When a water-body rule and the statewide rule disagree, the water-body rule wins.

Which species have special rules on Henrys Fork?

Rainbow trout has a water-body-specific rule on Henry's Fork of the Snake River, each linking to its full Idaho regulations above. Species not listed here follow the statewide Idaho limits.

2026 regulation year

Henry's Fork of the Snake River 2026 — Idaho Fishing Regulations

Idaho statewide rules apply unless overridden below.

Last updated June 4, 2026

Henry's Fork of the Snake River carries 2 special-regulation overlays on top of Idaho's 2026 fishing rules — covering Rainbow trout. Verify the agency booklet before launching: in-season changes are not yet wired to this page.

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State-level special regulation

Catch-and-release-only on Harriman State Park 'Railroad Ranch' fly-fishing-only reach; trout 6 / day combined elsewhere with 16-20 in min on Box Canyon + Last Chance quality-management reaches; rainbow trout self-sustaining wild fishery; one of country's premier dry-fly + technical-nymphing trout fisheries; IDFG Henrys Lake State Fish Hatchery facility upstream at Henrys Lake
Source: Idaho special-water list

Per-species rules on Henry's Fork of the Snake River

Rainbow trout regulations →
6 / day combined elsewhere with 16-20 in min on Box Canyon + Last Chance quality-management; CATCH-AND-RELEASE-ONLY on Harriman State Park 'Railroad Ranch' fly-fishing-only reach

Official source

Idaho Department of Fish and Game (IDFG) publishes the authoritative 2026 Idaho fishing regulations. Special-regulation lakes and rivers are listed in the agency booklet — always verify before fishing.

Visit official Idaho fishing regulations →

Emergency-order channel

In-season closures, slot-limit changes, and run-count-driven harvest pauses are posted to Idaho Department of Fish and Game's emergency-order feed — check it before any Idaho trip during the active season.

Other special-regulation waters in Idaho

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Frequently asked questions

What special fishing regulations apply at Henry's Fork of the Snake River?: Henry's Fork of the Snake River carries 2 special-regulation overlays that override Idaho's statewide 2026 rules, covering Rainbow trout. One of them reads: "Catch-and-release-only on Harriman State Park 'Railroad Ranch' fly-fishing-only reach; trout 6 / day combined elsewhere with 16-20 in min on Box Canyon + Last Chance quality-management reaches; rainbow trout self-sustaining wild fishery; one of country's premier dry-fly + technical-nymphing trout fisheries; IDFG Henrys Lake State Fish Hatchery facility upstream at Henrys Lake." Every overlay on this water body is listed in full above.
Do I need a fishing license to fish Henry's Fork of the Snake River?: Yes. Henry's Fork of the Snake River is in Idaho, so a valid Idaho fishing license is required just as it is anywhere else in the state, issued by Idaho Department of Fish and Game (IDFG). The special regulations on this page change the bag, size, slot, or gear rules for Henrys Fork; they do not waive the license requirement. Free-fishing days and youth exemptions follow the statewide Idaho rules.
Do Henry's Fork of the Snake River's special rules replace Idaho's statewide limits?: Only where they conflict. Idaho's statewide 2026 regulations apply on Henrys Fork by default; the overlays above replace the matching statewide rules for the species or gear they name, while everything not specifically overridden still follows the statewide rule. When a water-body rule and the statewide rule disagree, the water-body rule wins.
Which species have special rules on Henrys Fork?: Rainbow trout has a water-body-specific rule on Henry's Fork of the Snake River, each linking to its full Idaho regulations above. Species not listed here follow the statewide Idaho limits.

← Back to Idaho regulations overview