RCW 47.47.060
RCW 47.47.060: Project cost threshold for evaluation.
Any eligible transportation project with an estimated cost to the state of less than $500,000,000, or any project on a United States route that is not an interstate route and includes replacement of a seismically vulnerable elevated structure at least one and one-half miles long that crosses a river, may be evaluated for delivery under a public-private partnership model as prescribed under this chapter.