Wash. Rev. Code § 47.26.185
The transportation improvement board may adopt rules establishing qualifications for cities and counties administering and supervising the design and construction of projects financed in part from funds administered by the board. The rules establishing qualification shall take into account the resources and population of the city or county, its permanent engineering staff, its design and construction supervision experience, and other factors the board deems appropriate. Any city or county failing to meet the qualifications established by the board for administering and supervising a project shall contract with a qualified city or county or the department for the administration and supervision of the design and construction of any approved project as a condition for receiving funds for the project.
RCW 47.26.185
Savings-Severability-1988 c 167: See notes following RCW 47.26.121.