Middle Fork of the Salmon River
One hundred miles through the largest wilderness in the lower 48 — the Middle Fork of the Salmon is the benchmark multi-day river expedition, from technical upper canyon to deep lower gorge. · ID
The Middle Fork of the Salmon River is widely regarded as the finest multi-day river trip in the lower 48 states. One hundred miles from Boundary Creek to its confluence with the Main Salmon at Cache Bar, the Middle Fork descends through the Frank Church River of No Return Wilderness — the largest contiguous wilderness in the continental United States — with over 100 rapids, natural hot springs on the riverbank, ancient pictograph panels, pristine sandy beaches, and a gradient that starts steep and fast in the upper canyon and gradually eases as the river grows. The upper section drops at 30 feet per mile through tight, technical Class IV water in a narrow forested canyon. By the middle section, the river has gathered tributaries and volume, and the rapids become big-water Class III with long pools between them. The lower canyon opens into the deepest river gorge in North America — deeper than the Grand Canyon when measured from the surrounding peaks. The Middle Fork is the trip that serious river people put at the top of their list. The permit lottery reflects this: thousands apply for a few hundred launch dates each summer. Those who draw a permit rarely waste it.
Signature Experiences
- 100-mile expedition through the largest wilderness in the lower 48
- Hot springs soaks at Sunflower, Loon Creek, and other riverside thermal features
- Upper canyon technical Class IV — steep, fast, narrow
- Lower canyon — deepest river gorge in North America
- Sandy beach camping with no other groups in sight
- Ancient pictograph panels from the Tukudika (Sheepeater) Shoshone
1 sections, 104 miles
The Middle Fork cuts through the heart of the Idaho Batholith — the massive Cretaceous-age granitic intrusion that forms the core of central Idaho. The upper canyon is narrow and steep where the river cuts through hard granodiorite. The lower canyon deepens dramatically as the river descends into older rock, creating a gorge that rivals the Grand Canyon in depth when measured from the surrounding peaks of the Salmon River Mountains. Hot springs throughout the corridor indicate ongoing geothermal activity related to the batholith.
Age range: Proterozoic through Cenozoic
The Middle Fork is one of the most important remaining spawning corridors for ESA-listed chinook salmon and steelhead in the Columbia River Basin. The undammed river and its pristine tributaries provide the cold, clean spawning habitat these species require. The Frank Church Wilderness protects the entire watershed from development.