Idaho · Mixed · Rockies
Henry's Fork — upper/middle
Spring-creek and tailwater-influenced reaches; access varies.
Idaho · public-access reaches. This page is what the desk knows about the water itself. What it is doing today — flow, water temperature, weather, and the hazards those produce — is a reading with a date on it, and it lives in Trip Prep.
Plan a trip on Henry's Fork — upper/middleWho manages it
Idaho Department of Fish and Game
These links were checked against the live agency site on 2026-09-01. Rules for a water change inside a season, so the agency’s own page on the day you go is the only current answer — this desk does not hold one.
Directory review
Review provenance unavailable
No unique fleet-directory record matched this operational water by name and state, so the desk will not borrow another water’s review date. The agency links on this page were checked on 2026-09-01; check the agency’s own page the day you go.
How access works here
Mixed — some drive-to, some walk-in
This reach mixes drive-to and walk-in access. Some sections are road-adjacent, others need a walk from public ground.
Launch · Launch type varies by access point. Confirm on the agency map before you tow a boat to it.
Parking · Parking is at designated access points. A pullout that looks fine is not automatically legal or safe to leave a vehicle in.
Idaho publishes access points and boat ramps in the Fishing Planner map centre. Many reaches are reached from public road right-of-way or Forest Service land.
Gauge
A public gauge is mapped
Flow and water temperature for this water are read from USGS site 13046000, Henrys Fork near Ashton, ID. It is an official public gauge, not a fishing pin: it describes the river at one point, and the reach you stand in may be doing something else.
Species · reviewed
4 plausible here
Species commonly present in Henry's Fork — upper/middle. Seasons, slot limits and species-specific closures still come from Idaho Department of Fish and Game.
Rainbow trout
52–64°F published preference · handling becomes a conservation problem at 68°F
Brown trout
54–67°F published preference · handling becomes a conservation problem at 68°F
Cutthroat trout
48–62°F published preference · handling becomes a conservation problem at 66°F
Mountain whitefish
46–64°F published preference · handling becomes a conservation problem at 68°F