 Because US 101 forms the main street of almost all of the coastal towns in Oregon (with the exception of Cannon Beach, Pacific City and a few others), traffic is often congested and slow in the summer months.The highway crosses the mouth of the Columbia River over the Astoria-Megler Bridge at Astoria into Washington, and follows the Columbia downstream to Ilwaco.Oregon Route 42 (OR 42 and OR 42S) have taken over old portions of US 101 around Coquille following a bypass.