Between Gibbon and Cayuse, three creeks—Squaw, Buckaroo, and Coonskin—enter the river from the left.
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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.
Winans arrived in Umatilla River, Oregon in September 1859, and he worked as a warehouseman and a school teacher there until 1861.
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