Idaho Code § 70-1605
Except as to lands acquired or improved for industrial development, no improvements shall be acquired or constructed by the port district, unless such improvements shall, when completed, be the property of such port district, or the county in which such improvement is located, the state of Idaho, the United States of America or a sister state of the United States of America or some municipal or public corporation or political subdivision thereof, or shall be jointly owned by any two (2) or more thereof. The funds of such port district may be expended in the acquirement or construction of any harbor or port improvement embraced in such plan adopted as in this act provided, in conjunction with any such entity. In amplification and not in limitation of the foregoing, port districts may, in the exercise of all lawful port district powers, and for all lawful port district purposes, contract with, enter into joint leases and contracts of all types, enter into compacts, joint venture, incur indebtedness jointly, and in all lawful manner deal with other port districts and/or municipal corporations and/or political subdivisions of this state and/or of sister states, and/or of the United States of America. The power hereby granted shall include, but not be limited to the power to jointly own and operate port properties and/or facilities in one or more port districts, whether within or without the state of Idaho.
Idaho Code § 70-1605