U.S. Route 101
The nearly highway's northern terminus is in Tumwater, Washington: the route remains along the Olympic Peninsula's coastal perimeter west, north, and east; the northernmost point on the highway is in Port Angeles. The southern terminus of US 101 is in Los Angeles at the East Los Angeles Interchange, the world's busiest freeway interchange.
U.S. Route 101 in Oregon
North of Seaside, US 101 follows the coastal plain through cities such as Gearhart; a spur route (Oregon Route 104) provides access to Fort Stevens State Park. US 101 soon enters the city of Warrenton, Oregon (where Business 101, which is more of a scenic route, providing access to the Astoria-Warrenton Airport, Fort Clatsop, and Miles Crossing) and then crosses Youngs Bay into Astoria, Oregon. 101 passes through the northwestern edge of Astoria, until an intersection with U.S. Route 30. At this intersection, 101 climbs an access road onto the Astoria-Megler Bridge over the Columbia River, and crosses into the state of Washington.