Dietrich River
The Dietrich River is a long braided river in the Yukon-Koyukuk Census Area of Alaska. The headwaters originate in the Brooks Range. It flows south to join the Bettles River and to form the Middle Fork Koyukuk River.
The river forms a broad floodplain. Common species of fish found in the river include Arctic grayling, burbot, Dolly Varden trout, and whitefish.
The Dalton Highway ascends the Dietrich River valley and follows the river for 25 miles.