Idaho Code § 43-1507

In addition to the authority conferred upon the board of directors of an irrigation district by section 57-127, Idaho Code, such board shall have the authority to invest the surplus funds of such district, in the negotiable, general obligation bonds or other evidences of indebtedness of the United States or of this state or in local improvement district bonds or warrants authorized by chapter 17, title 50, or chapter 25, title 43, Idaho Code, in lieu of depositing the same in designated depositories as provided by the public depository law and to dispose of such bonds, warrants, or evidences of indebtedness as and when said board may direct.