Wash. Rev. Code § 90.40.010
The United States is hereby granted the right to exercise the power of eminent domain to acquire the right to the use of any water, to acquire or extinguish any rights, and to acquire any lands or other property, for the construction, operation, repairs to, maintenance or control of any plant or system of works for the storage, conveyance, or use of water for irrigation purposes, and whether such water, rights, lands or other property so to be acquired belong to any private party, association, corporation or to the state of Washington, or any municipality thereof; and such power of eminent domain shall be exercised under and by the same procedure as now is or may be hereafter provided by the law of this state for the exercise of the right of eminent domain by ordinary railroad corporations, except that the United States may exercise such right in the proper court of the United States as well as the proper state court.
RCW 90.40.010
Condemnation by corporations: Chapter 8.20 RCW.
Eminent domain, railroads-Corporate powers and duties: RCW 81.36.010.
Special railroad eminent domain proceedings: RCW 8.20.140, 28B.20.330, 81.36.020, 81.36.060, 81.53.180.