Upper Mesa Falls
A 114-foot waterfall on the Henry's Fork of the Snake River — one of the largest undisturbed waterfalls in the American West and the centerpiece of the Mesa Falls Scenic Byway (ID-47). A 0.4-mile ADA-accessible boardwalk leads from the parking area to elevated platforms with unobstructed canyon views. $5 Forest Service day-use fee. The historic Big Falls Inn (1906) sits adjacent to the overlook.
Upper Mesa Falls drops 114 feet on the Henry's Fork of the Snake River — and what makes it stand out is its status as one of the last major waterfalls in Idaho untouched by irrigation or hydroelectric development. The water pours over volcanic rock laid down by an ancient super-eruption, and that geological backstory is part of what the site's visitor center, housed in the historic Big Falls Inn, is set up to explain.
Getting to the overlook takes almost no effort. A short ADA-accessible boardwalk leads from the parking area to elevated viewing platforms at the canyon rim, close enough that mist reaches you on high-flow days. The byway itself — ID-47, running from Ashton northeast through the Caribou-Targhee National Forest before looping back to US-20 — is a two-lane paved road that carries a fraction of the traffic US-20 sees. Plan on the byway being open from mid-spring through fall; the Forest Service road section closes with the first plowable snowfall each autumn and typically doesn't reopen until mid-May. There's a $5 Forest Service day-use fee per vehicle at the falls.
Anchor stop on the Mesa Falls Scenic Byway, a smooth, lightly-traveled alternative to US-20 that loops through dense lodgepole forest near the Yellowstone plateau. The falls rival anything in Yellowstone without the park-entrance crowds.
Shot by the riders who've run it.
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