Guides/Overland routes/Idaho
Overland route28.2 midifficulty: easy

Mesa Falls Scenic Byway

RegionIdahoAgencyU.S. Forest Service, Idaho Transportation DepartmentLast verified—
Mesa Falls Scenic Byway — overland route near Ashton, Idaho, Idaho
Brenton Cooper (CC BY 2.0)
Trail vitals6 facts
Length
28.2mi
Technical difficulty
Easy
Direction
Point to point
Vehicle
Any street-legal vehicle. The byway is paved end to end on Idaho 47 and Forest Road 294.
Best months
May, Jun, Jul, Aug, Sep, Oct
Cell coverage
Spotty between Ashton and Harriman; service returns near US 20 at Island Park.
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The Mesa Falls Scenic Byway is a 28-mile paved loop in eastern Idaho that connects Ashton to US 20 near Harriman State Park, passing both Lower and Upper Mesa Falls on the Henry's Fork of the Snake River. The byway uses Idaho 47 and Caribou-Targhee National Forest Road 294, both two-lane paved routes that the Caribou-Targhee maintains in summer and grooms as a snowmobile corridor in winter.

Upper Mesa Falls drops 114 feet over volcanic ash and tuff exposed by the Henry's Fork. A boardwalk and overlook system runs from the Big Falls Inn day-use area, and a $5 day-use fee applies during the summer season. Most drivers cover the byway in under an hour, but plan extra for the falls walk.

Hazards

Read before you go

  • Winter closure. Forest Road 294 closes to vehicles late November through mid-May for snowmobile grooming.
  • Wildlife. Elk, moose, and grizzly bears are present in the Island Park area. Drive cautiously and store food properly at campsites.
  • Crowds at Upper Mesa Falls. Summer weekends fill the parking lot. Arrive early or visit after 4pm.
  • Weather. Summer thunderstorms develop fast on the caldera rim.

Location

28.2 mi · Overland route

Approx. location 44.187, -111.334

Trail facts

5 fields
AgencyU.S. Forest Service, Idaho Transportation Department
Nearest townAshton, Idaho
Websitevisitidaho.org/things-to-do/road-trips/mesa-falls-scenic-byway
ClosedDec, Jan, Feb
Approx. location44.187, -111.334

Getting there

Directions

Western terminus (Ashton). From US 20 in Ashton, turn east on Idaho 47 (Mesa Falls Scenic Byway). The route climbs through forest to the falls.

Eastern terminus (Harriman). From US 20 between Last Chance and Harriman State Park, turn south on Forest Road 294 (signed Mesa Falls Scenic Byway). The Caribou-Targhee gates this end in winter.

Photos

2 photos

Photos · 2

Field notes

Getting Oriented

The byway sits in eastern Idaho between Ashton and the Island Park caldera, on the Caribou-Targhee National Forest's Ashton-Island Park Ranger District. The route begins on Idaho 47 in Ashton, climbs onto the southern rim of the Henry's Fork caldera, and rejoins US 20 near Harriman State Park. The Caribou-Targhee maintains the Forest Service segment (FR 294); the Idaho Transportation Department maintains the state highway portion.

Trail Overview

Twenty-eight miles of two-lane pavement, point-to-point. The Caribou-Targhee opens FR 294 to vehicles each spring after snowmelt, typically mid-May, and closes it in late November when grooming for snowmobile season starts. The state highway portion stays open year-round. Both falls have day-use parking and developed overlook trails. Drive time is under an hour without stops.

Points of Interest

  • Lower Mesa Falls Overlook. A vault-toilet day-use area with a viewing platform on the canyon rim. The falls themselves drop into the Henry's Fork canyon below.
  • Upper Mesa Falls and Big Falls Inn. A 114-foot waterfall reached by a boardwalk system from the historic Big Falls Inn (now an interpretive center). $5 day-use fee in summer; America the Beautiful pass accepted.
  • Bear Gulch Snow Park. Trailhead and parking at the Mesa Falls Tuff exposure on FR 294.
  • Warm River Campground. USFS developed campground on the Warm River near the Idaho 47 segment.
  • Harriman State Park. Trumpeter swan habitat on the Henry's Fork; western terminus access from US 20.

Where to Camp

Warm River, Pole Bridge, Riverside, and Big Springs Campgrounds on or near the byway accommodate developed camping in summer. Dispersed camping is permitted on Caribou-Targhee land with the standard 14-day stay limit.

Tips for a Safe and Enjoyable Trip

  • FR 294 closes to vehicles roughly late November through mid-May. Check the Caribou-Targhee road status page before driving in shoulder seasons.
  • Bring the $5 fee or America the Beautiful pass for Upper Mesa Falls.
  • The boardwalk to Upper Mesa Falls is short and ADA-accessible; the canyon overlook is fenced.
  • Watch for trumpeter swans, sandhill cranes, and elk along the Henry's Fork. Pull off, don't stop in lane.
  • Combine with the Teton Scenic Byway out of Ashton for a longer eastern Idaho loop.

Frequently asked

Common questions

How difficult is Mesa Falls Scenic Byway?
Mesa Falls Scenic Byway is rated easy. The route runs 28.2 miles.
What kind of vehicle do you need for Mesa Falls Scenic Byway?
Any street-legal vehicle. The byway is paved end to end on Idaho 47 and Forest Road 294.
When is the best time to visit Mesa Falls Scenic Byway?
The best months are May, Jun, Jul, Aug, Sep, Oct. Avoid Dec, Jan, Feb.
Is there cell service at Mesa Falls Scenic Byway?
Spotty between Ashton and Harriman; service returns near US 20 at Island Park.