Idaho Code § 70-1721
The port commission shall cause to be levied annually at the time and in the manner general port district taxes are levied upon all the taxable property within the district, in addition to all other taxes, a tax sufficient with other available funds to enable the district to pay the principal of and interest on such bonds as the same become due. Such taxes shall be levied, assessed, certified, extended and collected by the proper officers and at the times and in the manner other port district taxes are levied, assessed, certified, extended and collected until the principal of and interest on all such bonds shall have been fully paid. All of such taxes so collected shall be credited to a separate port district fund and shall be used solely to pay the principal of and interest on such bonds.
Idaho Code § 70-1721