Idaho Code § 70-1212
Nominations for port commissioners at the formation election, at any annexation elections, and for all general elections shall be by petition of not less than five (5) qualified electors of the commissioner district of which the candidate is a resident, and shall be filed in the office of the county clerk of the county in which such commissioner district is situate, in accordance with the provisions of section 34-1404, Idaho Code.
In any election for commissioner, if after the deadline for filing a declaration of intent as a write-in candidate, it appears that only one (1) qualified candidate has been nominated for a commissioner position, it shall not be necessary for the candidate to stand for election, and the port commission shall declare such candidate elected as a commissioner, and the secretary of the commission shall immediately make and deliver to such person a certificate of election.
Idaho Code § 70-1212