Powder River
Tributary in Montana
Powder River is a tributary of the Yellowstone River, approximately 375 miles long in northeastern Wyoming and southeastern Montana in the United States. Combined with its tributary, the South Fork Powder River, it is 550 miles long. Wikipedia
Mouth: Yellowstone River
Source: Bighorn Mountains
Length: 375 mi
Discharge: 558 ft³/s
Bridges: Powder River Bridge