henrys-fork

Henrys Fork is a fork in Idaho.

It ranks #1 among the 28 waters of Idaho in the registry, and is of national prominence.

Also called Henry's Fork, Henrys Fork of the Snake River, Henry's Fork of the Snake River, North Fork Snake River, North Fork of the Snake River, Henrys and Graduate School of Fly-Fishing for Ph.D. Trout.

Fished for trout (inferred from the species listed).

Species: rainbow trout, brown trout, cutthroat trout and brook trout.

USGS GNIS record: 1892144.

Stretches: Box Canyon, Cardiac Canyon, Harriman State Park, Last Chance, Ashton Tailwater, Canyon Country, Upper Henry's Fork, Warm River to Ashton and Lower Henry's Fork.

Access points: Osborne Bridge, Railroad Ranch Access, Riverside Campground, East Hatchery Ford, Mack's Inn Bridge, McCrea Bridge, Ora Bridge, Stone Bridge, Vernon Bridge, Wood Road, Fun Farm Bridge, Upper Coffee Pot Campground and Warm River Campground.

Holes: Bonefish Flats, Coffee Pot Rapids and Millionaires Pool.

Features: Island Park Dam, Ashton Dam, Big Springs, Chester Dam and Lower Mesa Falls.

Box Canyon Boat Ramp (access). It is fishable and launchable. Concrete ramp; put-in for the Box float: 4 mi to Last Chance, 7 mi to Osborne Bridge (HFF). Also called Box Canyon Put-In.

It is on the stretch Box Canyon.

It is part of Box Canyon.

It is upstream of Box Canyon Campground.

It is downstream of Island Park Dam.

Last Chance Boat Ramp (access). It is fishable and launchable. Put-in and take-out; 6.5 mi float to Osborne Bridge (HFF). Also called Last Chance Access.

It is on the stretch Last Chance.

It is part of Last Chance.

It is upstream of Angler's Parking / Log Jam.

Angler's Parking / Log Jam (access). It is fishable. USFS (Caribou-Targhee) parking above the Harriman boundary; wading. Also called Log Jam.

It is on the stretch Last Chance.

It is upstream of Mailbox.

It is downstream of Last Chance Boat Ramp.

Big Springs Water Trail (access). It is launchable. Put-in for canoes/kayaks/rafts only; 4 mi float to Mack's Inn Bridge (HFF).

It is on the stretch Upper Henry's Fork.

It is upstream of Mack's Inn Bridge.

It is downstream of Big Springs.

Box Canyon Campground (access). It is fishable. Hike-in wading access (HFF). Perfect Fly Store also lists Box Canyon access 'along the old highway'.

It is on the stretch Box Canyon.

It is part of Box Canyon.

It is downstream of Box Canyon Boat Ramp.

Del Rio Bridge (access). It is fishable. Name appears only on the Henry's Fork Foundation access map.

It is on the stretch Lower Henry's Fork.

It is downstream of Fun Farm Bridge.

Grandview Campground (access). It is launchable. Listed on the Henry's Fork Foundation access map as 'Put-in/Rafts only' below Mesa Falls.

It is on the stretch Canyon Country.

It is downstream of Lower Mesa Falls.

Jumpoff Canyon (access). It is fishable. Listed as an access site on the Henry's Fork Foundation angler-access map (above Ashton Reservoir). Name appears only on that map -- single source.

It is on the stretch Warm River to Ashton.

It is downstream of Stone Bridge.

Mailbox (access). It is fishable. Hike-in wading access just above Harriman State Park (USFS land per HFF).

It is on the stretch Last Chance.

It is downstream of Angler's Parking / Log Jam.

Ranchview (access). It is fishable and wade only. Harriman State Park access with restroom (HFF).

It is on the stretch Harriman State Park.

It is upstream of Sage Flats.

It is downstream of Railroad Ranch Access.

Sage Flats (access). It is fishable and wade only. Harriman State Park access (HFF). Name is an access label, not a documented pool.

It is on the stretch Harriman State Park.

It is upstream of Osborne Bridge.

It is downstream of Ranchview.

Pinehaven (feature). Private property — no public access. Private subdivision, not a public access point. Also called Pine Haven.

Float: Box Canyon, from Box Canyon Boat Ramp to Last Chance Boat Ramp, 4 miles.

Float: Big Springs Water Trail, from Big Springs Water Trail to Mack's Inn Bridge, 4 miles.

Float: Wood Road to Hatchery Ford, from Wood Road to East Hatchery Ford, 8 miles.

Float: Box Canyon to Osborne Bridge, from Box Canyon Boat Ramp to Osborne Bridge, 7 miles.

Float: Osborne Bridge to Riverside, from Osborne Bridge to Riverside Campground, 6 miles.

Float: Osborne Bridge to Pine Haven.

Float: Riverside to Hatchery Ford (Cardiac Canyon, def. A), from Riverside Campground to East Hatchery Ford, 5 miles.

Float: Last Chance to Osborne Bridge (the Ranch), from Last Chance Boat Ramp to Osborne Bridge, 6.5 miles.

Float: Osborne Bridge to Wood Road, from Osborne Bridge to Wood Road, 2.5 miles.

Float: Wood Road to Riverside, from Wood Road to Riverside Campground, 3 miles.

Sourced from 10 independent fly sites.

Sources: bigskyanglers.com, bigskyanglers.com (2), cdn.orvis.com (retrieved 2026-10-20), edits.nationalmap.gov, Henry's Fork Foundation, Henry's Fork Foundation (2), henrysforkanglers.com, howtoflyfish.orvis.com, islandparkidaho.com, kenlockwood.tu.org, The Perfect Fly Store (retrieved 2026-10-20), sportingclassicsdaily.com, threeriversranch.com (retrieved 2026-10-20), trroutfitters.com and worldcastanglers.com.

Access, closures and rules change; check with the state agency before you go.