Wash. Rev. Code § 87.68.070
Funds in the custody of the board of control of the Sunnyside Division, Yakima Project, or any similar board created or operated by contract or otherwise under or pursuant to the federal reclamation laws, or acting as operating agent for the United States and/or irrigation districts of this state or of other states, may be deposited on general deposit in any one or more banks in this state which such board of control may designate. All such deposits shall be made in the name of the board and be subject to payment on demand on the check of any officer or agent fully authorized and designated by such board. The board of control of the Sunnyside Division, Yakima Project, referred to herein, is the board of control created by the respective contracts entered into by and between the United States of America and the Sunnyside Valley Irrigation District and other irrigation districts of the Sunnyside Division of the Yakima Project, in the state of Washington, under the provisions of the act of congress of June 17, 1902 (32 Stat. 388), and acts amendatory thereof or supplementary thereto, all generally referred to as the federal reclamation laws.
RCW 87.68.070