ORS § 105.715
The mode of proceeding in a boundary action is analogous to that of an action not triable by right to a jury. At the time of entering the judgment fixing the true location of the disputed boundary or dividing line the court shall appoint three disinterested commissioners, one of whom shall be a registered professional land surveyor, and shall direct the commissioners to go upon the land of the parties and establish and mark out upon the grounds, by proper monuments, the boundary or dividing line as ascertained and determined by the court in its judgment. The monuments shall be established by or under the direct supervision of the registered professional land surveyor who shall file a record of survey, complying with ORS 209.250, with the county surveyor.
ORS 105.715