Wash. Rev. Code § 79.110.140
The location and plans of any bridge, draw bridge, or trestle proposed to be constructed under RCW 79.110.110 through 79.110.130 shall be submitted to and approved by the department before construction is commenced. However, in case the portion of the waterway, river, stream, or watercourse, at the place to be crossed is navigable water of the United States, or otherwise within the jurisdiction of the United States, the location and plans shall also be submitted to and approved by the United States army corps of engineers before construction is commenced. When plans for any bridge or trestle have been approved by the department and the United States army corps of engineers, it is unlawful to deviate from the plans either before or after the completion of the structure, unless the modification of the plans has previously been submitted to, and received the approval of the department and the United States army corps of engineers, as the case may be. Any structure authorized and approved as indicated in this section shall remain within the jurisdiction of the respective officer or officers approving the structure, and shall be altered or changed from time to time at the expense of the municipality owning the highway, or at the expense of the common carriers, at the time owning the railway or road using the structure, to meet the necessities of navigation and commerce in such a manner as may be from time to time ordered by the respective officer or officers at the time having jurisdiction of the structure, and the orders may be enforced by appropriate action at law or in equity at the suit of the state.
RCW 79.110.140