Oregon Revised Statutes Shipping and Navigation § 777.326

(1) This section applies when an annexation would increase the area of a port by one-half or more, or would increase the assessed value of taxable property within a port by one-half or more. An annexation proposal subject to this section, if approved by the county board, shall be submitted to the electors at an election which shall be held at the same time as a primary election or general election.

(2) When the county board orders an election on the annexation proposal, the board shall adopt an order dividing or redividing the area of the port, including the territory annexed, into five subdistricts. The boundaries of the subdistricts shall be determined in accordance with ORS 777.155 and shall be described in the order calling the election on the proposed annexation.

(3) At the first regular district election following the effective date of the annexation, one commissioner from each of the five subdistricts established under subsection (2) of this section shall be elected. The terms of the incumbent commissioners shall terminate and the terms of the commissioners elected under this subsection shall commence as provided in ORS 777.160.

(4) If the annexation is approved, the order proclaiming the annexation shall also describe the boundaries of the subdistricts established as provided by subsection (2) of this section.