Oregon Revised Statutes Shipping and Navigation § 778.110

(1) The Port of Portland may employ engineers, superintendents, mechanics, clerks and other persons as necessary or convenient in carrying on its work and fix their rates of compensation.

(2) No employee of the port shall become a member of the Public Employees Retirement System if membership of the employee in the system would result in coverage of the employee by, and contributions on the employee's behalf by the port to, both a private pension system and the Public Employees Retirement System.