Oregon Revised Statutes Shipping and Navigation § 777.430

(1) In carrying out the purposes of ORS 777.005 to 777.725 and 777.915 to 777.953, a port may assess, levy and collect taxes upon all taxable real and personal property situated within the port, in an amount each year not to exceed one-fourth of one percent (0.0025) of the real market value of the property, computed in accordance with ORS 308.207.

(2) Each year a port may also assess, levy and collect a tax upon all such property in an amount sufficient to pay the yearly interest on general obligation bonds or other evidences of indebtedness theretofore issued by the port and then outstanding, together with any portion of the principal of general obligation bonds maturing within that year. The tax shall be applied only in payment of interest and principal of such bonds or indebtedness. However, the board may apply any other funds it may have toward such payments.