Dworshak Dam is a dam in Clearwater County , Idaho . The North Fork of the Clearwater River runs 2 m downstream from the base of the dam , where it joins the main Clearwater , which flows into the Snake River at Lewiston , and into the Columbia at Burbank , Washington . The Dworshak Dam and Reservoir civil works project includes Dworshak Dam , the reservoir and surrounding Corps-managed lands , powerhouse , recreation facilities , wildlife mitigation and Dworshak National Fish Hatchery .