I-82 and US 395 travel southward and ascend the Horse Heaven Hills to an intersection with SR 397, a highway that provides an alternate truck route for Kennewick and Finley. The freeway continues southwestward along Bofer and Fourmile canyons, descending from the hills and passing irrigated farmland while approaching the Columbia River. Northeast of Plymouth, it intersects the eastern terminus of SR 14, a cross-state highway that follows the Columbia River westward to Vancouver, and crosses the BNSF Fallbridge Subdivision, which carries Amtrak's Empire Builder passenger trains. I-82 and US 395 cross the Columbia River west of McNary Dam on Umatilla Bridge, which consists of a unique, multiple cantilever, steel truss bridge carrying the eastbound lanes, a newer concrete segmental bridge that carries the westbound lanes, and a multi-use trail for bicyclists and pedestrians.