Wash. Rev. Code § 47.87.030
(2) Local governments may by resolution enter a commission formation agreement, consistent with the requirements of this chapter, to charter and form a commission. The commission formation agreement shall, at a minimum, be approved and executed by the owner of an existing bridge and the governing bodies of the counties within which an existing bridge is situated. A commission formation agreement may be enacted by local governments in phases. However, all required elements of a commission formation agreement must be enacted by the local governments prior to any board authorization to issue toll revenue bonds for the construction of the bridge. The commission formation agreement shall establish the following provisions:
(4) The purposes of the commission are to:
[ 2022 c 89 s 3.]