ORS § 539.110
The Water Resources Director shall fix the time and a convenient place for hearing the contest, and shall notify the contestant and the person whose rights are contested to appear before the director or the authorized assistant of the director at the designated time and place. The date of hearing shall not be less than 30 nor more than 60 days from the date the notice is served on the parties. The notice may be served personally or by registered or certified mail, return receipt requested, addressed to the parties at their post-office addresses as stated in the statement and proof of claimant. The director may adjourn the hearing from time to time upon reasonable notice to all the parties interested; may issue subpoenas and compel the attendance of witnesses to testify, which subpoenas shall be served in the same manner as subpoenas issued out of the circuit court; may compel the witnesses so subpoenaed to testify and give evidence in the matter; and may order the taking of depositions and issue commissions therefor in the same manner as depositions are taken in the circuit court. The witnesses shall receive fees as provided in ORS 44.415 (2), the costs to be taxed in the same manner as are costs in suits in equity. The evidence in the proceedings shall be confined to the subjects enumerated in the notice of contest. The burden of establishing the claim shall be upon the claimant whose claim is contested. The evidence may be taken by a duly appointed reporter.
ORS 539.110