WSDOT owns and operates much of the state's transportation system.
State Highways
WSDOT owns and operates more than 7,043 centerline miles of state highways that link all parts of the state including crossings of six mountain passes. WSDOT is responsible for the entire system, which includes more than 3,000 bridges, 34 tunnels, 43 safety rest areas, 54 weigh stations and 97,500 acres of roadside land. Water drainage on the system is managed through more than 42,500 culverts and outfalls and 33,500 catch basins. This system connects with an additional 75,127 centerline miles of county roads, city streets and other state and federal roads, providing access to and from all locations in the state.
Washington State and Interstate Highways
2006 Miles of Road and Vehicle Miles Traveled
Source: WSDOT Key Facts and Transportation Data Office