(1) Port districts are hereby authorized to be established in the various counties of the state for the purposes of acquisition, construction, maintenance, operation, development and regulation within the district of harbor improvements, rail or motor vehicle transfer and terminal facilities, water transfer and terminal facilities, air transfer and terminal facilities, or any combination of such transfer and terminal facilities, and other commercial transportation, transfer, handling, storage and terminal facilities, and industrial improvements.
(2) Powers of a port district that is located in a county that has a contiguous border with another state, and a population between fifty and seventy thousand, shall be exercised within the district, except as otherwise provided by statute or pursuant to an interlocal cooperation agreement with another public agency as defined in chapter 39.34 RCW. In addition to other requirements of chapter 39.34 RCW, such an interlocal cooperation agreement may involve the exercise of a port district's powers for a port district that is located in a county that has contiguous borders with another state, and a population between fifty and seventy thousand, outside the boundaries of the state of Washington in whole or in part only if found, by resolution of the port district commission exercising such authority, to be reasonably necessary for the effective exercise of the port district's statutory powers and for the benefit of the inhabitants of the district and the state of Washington. The resolution may be adopted only after a public hearing of which notice has been published in a newspaper of general circulation within the district at least ten days in advance.