Interstate 82 (I-82) is a 143.58-mile (231.07 km) Interstate Highway that extends from I-90 in Ellensburg, Washington, to I-84 near Umatilla, Oregon, in the United States. In the state of Washington, it serves the cities of Ellensburg, Yakima, and the Tri Cities (via I-182), and in Oregon, it serves Umatilla and Hermiston. It is the major route westwards to Seattle and eastwards to Boise and Salt Lake City (via I-84 and I-15).