Wash. Rev. Code § 79.110.310
In order to obtain the benefits of the grant provided for in RCW 79.110.300, the irrigation district, irrigation company, person, or the United States of America, constructing or proposing to construct an irrigation ditch or pipeline for irrigation, or the diking and drainage district or diking and drainage improvement district constructing or proposing to construct any dike or drainage ditch, shall file with the department a map accompanied by the field notes of the survey and location of the proposed irrigation ditch, pipeline, dike, or drainage ditch, and shall pay to the state as provided in RCW 79.110.320, the amount of the appraised value of the lands used for or included within the right-of-way. The land within the right-of-way shall be limited to an amount necessary for the construction of the irrigation ditch, pipeline, dike, or drainage ditch for the purposes required, together with sufficient land on either side for ingress and egress to maintain and repair the irrigation ditch, pipeline, dike, or drainage ditch.
RCW 79.110.310