Idaho Code § 40-1517

If the consolidated highway district commissioners determine that valid outstanding indebtedness of any of the former highway districts, existing prior to the consolidation may be funded or refunded to the profit and benefit of the taxpayers within the boundaries of the former highway district, and without incurring any additional liability, the highway commissioners have the power and authority to make provision for issuing of funding or refunding bonds in an amount equal to the unpaid principal and interest on the outstanding bonds or other indebtedness. Before the highway commissioners shall issue any bonds to refund any outstanding indebtedness, it shall cause all moneys of the former highway district on hand available for the payment and discharge of any indebtedness to be applied in payment and discharge of them and issue funding or refunding bonds only for the remainder of the indebtedness. The issuance of bonds shall not create any liability against the consolidated highway district or any of the property within its boundaries, excepting that the property within the boundaries of the former highway district shall be liable for the payment of the bonds.