Washington State Route 100
SR 100 highlighted in red | ||||
| Route information | ||||
| Auxiliary route of US 101 | ||||
| Maintained by WSDOT | ||||
| Length | 4.68 mi (7.53 km) | |||
| Existed | 1991–present | |||
| Tourist routes | Lewis and Clark Trail | |||
| Major junctions | ||||
| CCW end | US 101 in Ilwaco | |||
| CW end | SR 100 in Ilwaco | |||
| Location | ||||
| Country | United States | |||
| State | Washington | |||
| County | Pacific | |||
| Highway system | ||||
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State Route 100 (SR 100) is a 4.68-mile-long (7.53 km) state highway in the U.S. state of Washington, serving Cape Disappointment State Park in Pacific County. The highway travels counterclockwise from U.S. Route 101 (US 101) in Ilwaco south to Cape Disappointment and north to an intersection with itself in Ilwaco. SR 100, part of the Lewis and Clark Trail Scenic Byway, serves as a loop route and has a spur route that serves the state park and a Coast Guard station. SR 100 was established in 1991 on the existing North Head Road, which was a paved county road by the late 1950s. The highway was washed away during a 1994 winter storm and had its spur route shortened in 2006.