Wash. Rev. Code § 81.64.020
On application being made to the county legislative authority for such authority, the county legislative authority shall fix a time and place for hearing the same, and shall cause the county auditor to give public notice thereof at the expense of the applicant, by posting written or printed notices in three public places in the county seat of the county, and in at least one conspicuous place on the road or street or part thereof, for which application is made, at least thirty days before the day fixed for the hearing, and by publishing a like notice once a week for two consecutive weeks in the official county newspaper, the last publication to be at least five days before the day fixed for the hearing, which notice shall state the name or names of the applicant or applicants, a description of the roads or streets or parts thereof for which the application is made, and the time and place fixed for the hearing. The hearing may be adjourned from time to time by order of the county legislative authority. If, after the hearing, the county legislative authority shall deem it to be for the public interest to grant the authority in whole or in part, it may make and enter the proper order granting the authority applied for or such part thereof as it deems to be for the public interest, and shall require such railroad or railway and its appurtenances to be placed in such location on or along the road or street as it finds will cause the least interference with other uses of the road or street.
RCW 81.64.020