Mile 14.5 - Sheer Wall Rapid and Tanner Wash

The U.S. Geological Survey Colonel Birdseye Expedition of 1923 named this rapid due to the sheer nature of the canyon walls abutting the river on both sides. The drainage is named after Seth B. Tanner, pioneer and canyon dweller who in the late 1800s followed the upper part of the drainage along the Echo Cliffs to Tuba City. Tanner also spent many years prospecting, mining, and trail building in parts of eastern Grand Canyon.