Idaho Code § 42-1403
It shall be the duty of the clerk of the district court in each of the counties of this state to prepare at the expense of the county, and transmit without delay to the department of water resources by express or registered mail, a certified copy of the allotments of the various streams, made by the district court and now on file in the offices of the district court in the various counties of the state: provided, that said clerk may, in place of such transcript, transmit such original records of such decrees as are recorded in books kept for that purpose. Immediately upon receipt of said transcripts or said original records, it shall be the duty of the department to record them in its files, and to classify and arrange said decrees by placing all the rights to water of one stream and its tributaries together, and the department shall send to each watermaster a certified copy of the allotments made by the district court of all the streams within his district. And when an allotment of the waters of a stream shall be made by the district court, the clerk of such district court shall immediately prepare, at the expense of the county, and transmit to the department of water resources, a certified copy of the decree allotting such waters. The director may issue an abstract of decreed water right which shall describe the elements of a water right as contained in the water right decree.
Idaho Code § 42-1403