Washington / Oregon State Line South to city of Astoria, Oregon 4.2 miles. North side of the Astoria-Megler Bridge crossing the Columbia River. North to city of Aberdeen, Washington. NOTE: For highway travel south, via Oregon U.S. Highway #101 See Milebymile.com Road Map Highway Travel Guide - Oregon U.S. Highway #101 - Oregon / Washington State Line to California / Oregon State Line, for driving directions. Pacific Coast Scenic Byway From Oregon to Olympia this highway runs along the Pacific coast turning inland along the Olympic Mountains then returning along the coastline of the interior straights.