The Umatilla River is an 89-mile tributary of the Columbia River in northern Umatilla County, Oregon, United States. Draining a basin of 2,450 square miles, it enters the Columbia near the city of Umatilla in the northeastern part of the state. In downstream order, beginning at the headwaters, major tributaries of the Umatilla River are the North Fork Umatilla River an…The Umatilla River is an 89-mile tributary of the Columbia River in northern Umatilla County, Oregon, United States. Draining a basin of 2,450 square miles, it enters the Columbia near the city of Umatilla in the northeastern part of the state. In downstream order, beginning at the headwaters, major tributaries of the Umatilla River are the North Fork Umatilla River and the South Fork Umatilla River, then Meacham, McKay, Birch, and Butter creeks.
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