Jackson's Hole, is the Snake River.
Along this river, Lake Umatilla can be found behind the John Day Dam. Flowing past Longview and Revelstoke, this river's tributaries include the Kettle and Pend-Oreille Rivers. This river's largest tributary, which contains the Shoshone Falls and flows through(*) Jackson's Hole, is the Snake River. This river, the site of the Bonneville Dam, also includes Lake Roosevelt, which is formed by the Grand Coulee Dam, and it receives the Willamette. For 10 points, identify this Pacific Northwest river that forms much of the border between Washington and Oregon.
Along this river, Lake Umatilla can be found behind the John Day Dam.
{Columbia} River