 Between Gibbon and Cayuse, three creeks—Squaw, Buckaroo, and Coonskin—enter the river from the left.Downstream of Cayuse, Moonshine, Cottonwood, and Mission creeks also enter from the left.The river flows by Mission at about river mile (RM) 61 or river kilometer (RK) 98, leaves the Indian reservation, and reaches the city of Pendleton at about RM 56 (RK 90), passing under Oregon Route 11.