Washington State Route 401

State Route 401
SR 401 is highlighted in red.
Route information
Maintained by WSDOT
Length	12.13 mi[1] (19.52 km)
Existed	1964[2]–present
Tourist routes	Lewis and Clark Trail
Major junctions
South end	US 101 in Megler
North end	SR 4 in Naselle
Location
Country	United States
State	Washington
Counties	Pacific
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 397 → I-405

State Route 401 (SR 401) is a 12.13-mile (19.52 km) long state highway in Pacific County within the U.S. state of Washington. The highway originates at the north end of the Astoria–Megler Bridge west of Megler at an intersection with U.S. Route 101 (US 101). The roadway travels northeast, paralleling cliffs, the Columbia River and the South Fork of the Naselle River to Naselle, ending at SR 4. The road was designated Secondary State Highway 12B (SSH 12) between 1937 and 1964, when SR 401 was created to replace SSH 12B. The Astoria–Megler Bridge, completed in 1966, replaced a ferry east of the bridge, where the highway originally ended, and is known locally as Kingston Ferry Road. The roadway was extended west to the north end of the bridge, where it currently terminates. The former ferry terminal became the Dismal Nitch rest area, named after the Lewis and Clark Expedition's description of the place.