Idaho Code § 43-1809

After authorization of indebtedness shall have been made by the voters, evidenced by an election as provided in section 43-401[, Idaho Code], the board of directors may enter into a contract or obligation with the United States as provided in this chapter and issue or not issue bonds, depending on whether bonds shall be deposited with said contract; or the board of directors may issue bonds for a portion of the amount of indebtedness authorized by said bond election and enter into any obligation or contract with the United States as aforesaid to the extent of the remainder of said amount.