Idaho Code § 43-1701
In case there are within the boundaries of an irrigation district organized under the laws of this state lands which are in a condition to be selected under the Carey Act laws of the United States of America, the board of directors of an irrigation district may, and it is hereby authorized and empowered to file with the department of water resources a request for the selection, on behalf of the state, by the department, of the lands to be reclaimed, designating said lands by legal subdivisions.
This request shall be accompanied by a proposal to construct the ditch, canal or other irrigation works necessary for the complete reclamation of the lands asked to be selected and the lands within the district. The proposal shall be prepared in accordance with the rules of the department of water resources of the state of Idaho and with the regulations of the department of the interior, and shall be accompanied by a certificate that application for permit to appropriate water has been filed, together with the department's report thereon. It shall state the source of the water supply, the location and dimensions of the proposed works and the estimated cost thereof.
Idaho Code § 43-1701