Idaho Code § 42-2910
The judge of the district court within ten (10) days thereafter shall appoint three (3) drainage commissioners. The commissioners shall be appointed from among those living in the county where said proposed district is located.
The board of drainage commissioners appointed as aforesaid shall be entitled to enter upon the duties of their office upon qualifying as county officers are required to qualify, and upon each drainage commissioner giving a bond to the state of Idaho, for the benefit of said drainage district, for the faithful performance of his duties as such drainage commissioner, in the penal sum of $5000, with one or more sureties to be approved by the judge of the district court. Provided that the judge of the district court, upon application and proper showing by the board of drainage commissioners, may enter an order reducing the penalty of the bond to such sum as may appear to him to be reasonable and adequate under the showing made. The drainage commissioners shall take the oath of office and file their bonds within fifteen (15) days after they are appointed; and they shall hold office until their successors are duly appointed and qualified. Each drainage commissioner thereafter who may be appointed shall enter into a like bond and of like effect upon entering upon his duties, which bond shall be approved by the judge of the district court of the county in which said drainage district is located. The bonds of the drainage commissioners shall be filed with the clerk of the district court and kept in his custody. Immediately after their appointment and their bonds have been filed and approved, the drainage commissioners shall organize themselves into a board, and they shall by lot determine the terms of their office, which shall be one (1), two (2) or three (3) years respectively. Annually thereafter the judge of the district court of the county in which said district is located shall appoint one (1) drainage commissioner whose term of office shall be for three (3) years.
Idaho Code § 42-2910