U.S. Route 101
U.S. Route 101, or U.S. Highway 101 (US 101) is a north–south United States Numbered Highway that runs through the states of California, Oregon, and Washington, on the West Coast of the United States. It is also known as (The Royal Road) where its route along the southern and central California coast approximates the old trail which linked the Spanish missions, pueblos, and presidios. It merges at some points with California State Route 1 (SR 1).
U.S. Route 101 in Washington
US 101 enters Washington from Oregon on the Astoria–Megler Bridge, a bridge that carries vehicles across the Columbia River near its mouth; it is the longest continuous truss bridge in North America and among the longest of its kind in the world. At the north end of the bridge is an intersection with State Route 401 (SR 401), where US 101 turns west to follow the north bank of the river, forming part of the Lewis and Clark Trail Scenic Byway. The highway passes under Fort Columbia State Park in a tunnel and continues along the Willapa Hills through Chinook towards Baker Bay. At the head of the bay, near Port of Ilwaco Airport, US 101 intersects a short alternate route that bypasses the coastal section of the highway. US 101 then dives southwesterly along the Wallacut River into Ilwaco, where it runs through town as Spruce Street before turning north onto 1st Avenue after an intersection with SR 100.