Idaho Code § 70-1601
It shall be the duty of the port commission of any port district, before creating any improvements hereunder, to adopt a comprehensive plan of harbor improvement and port development for such port district after a public hearing thereon, notice of which shall be given by publication in a daily newspaper of general circulation in such port district by one (1) publication at least ten (10) days prior to the date of hearing, and no expenditure for the carrying on of any harbor improvement or port development shall be made by said commission other than necessary salaries, including engineers, clerical and office expenses of such port district, and the cost of engineering, surveying, preparation and collection of data necessary for the making and adoption of a general plan of harbor improvement and port development for such port district, unless and until such comprehensive plan of harbor improvement and port development has been so officially adopted by the port commission.
Recognizing that it will be necessary that port districts engage in long range planning, and that it will normally be necessary to alter such plan from time to time, such plan need only be in general terms.
Idaho Code § 70-1601