Or. R. App. P. 8.45

As amended through January 17, 2024
Rule 8.45 - DUTY TO GIVE NOTICE WHEN FACTS RENDER APPEAL MOOT
(1) When an appellant becomes aware of facts that render an appeal moot, except as to facts the disclosure of which is barred by the attorney-client privilege, the appellant must provide notice of the facts to the court.
(a) If the appellant filing the notice believes that the appeal should not be dismissed, the notice must include the appellant's argument against dismissal.
(b) Any other party may, within 14 days after the filing of a notice, file a response arguing that the appeal should or should not be dismissed. An appellant may, within seven days after the filing of a response, file a reply.
(c) If the notice does not include an argument against dismissal and no party files a response arguing against dismissal, the court may treat the notice as an unopposed motion to dismiss the appeal.
(2) When an appellant believes that the appeal is moot based on privileged facts, that party may move to dismiss the appeal as moot, but need not reveal the privileged facts.
(3) When a respondent becomes aware of facts that render an appeal moot, the respondent must either move to dismiss or provide notice of the facts with argument against dismissal to the court. Any other party may, within 14 days after the filing of the motion or notice, file a response arguing that the appeal should or should not be dismissed. A respondent may, within seven days after the filing of a response, file a reply.
(4)
(a) If a party becomes aware of nonprivileged facts that may render an appeal moot and has reason to believe that the other party or parties are unaware of those facts, the party must promptly inform the other party or parties of those facts.
(b) If no notice is given under this subsection and the court later dismisses the appeal as moot based on those facts, the court, on motion of an aggrieved party, may award costs and attorney fees incurred by the aggrieved party after notice should have been given of the facts that may have rendered the appeal moot, payable by the party who had knowledge of those facts.

Or. R. App. P. 8.45

Amended November 21, 2022, effective 1/1/2023.