After the date that ballots are mailed as provided in ORS 254.470, the county clerk, if requested, shall permit authorized persons to be at the office of the county clerk to watch the receiving and counting of votes. The authorization shall be in writing, shall be signed by an officer or its county affiliate of a political party, a candidate or the county clerk and shall be filed with the county clerk. The county clerk shall permit only so many persons as watchers under this section as will not interfere with an orderly procedure at the office of the county clerk.
ORS 254.482