Bull Trout Distribution, Movements and Habitat Use in the Walla Walla and Umatilla River Basins

A better understanding of Endangered Species Act-listed bull trout life history strategies

is necessary to identify corrective actions that will make progress toward recovery in the Walla

Walla and Umatilla basins. This report describes studies conducted by the U.S. Fish and

Wildlife Service in 2004 on the lower South Fork Walla Walla River, mainstem Walla Walla

River, and Umatilla River with the goal of providing detailed information to assist with

development of recovery actions. These studies were designed to describe seasonal distribution

and movements, and to determine the physical conditions that comprise suitable habitat for bull

trout.