What is the length of the River which has Wild Horse Creek as a tributary ?
Powder River (Wyoming and Montana) Powder River is a tributary of the Yellowstone River, approximately 375 mi long in northeastern Wyoming and southeastern Montana in the United States. It drains an area historically known as the Powder River Country on the high plains east of the Bighorn Mountains.
Little White River (South Dakota) The Little White River (Lakota: 'Makhízita Čík'ala' ; formerly known as the South Fork of the White River) is a tributary of the White River, approximately 234 miles (377 km) long, in south central South Dakota in the United States.