From Ancestry.com Wiki
This entry was originally written by Dwight A. Radford for Red Book: American State, County, and Town Sources.
Immigrants arrived in Oregon from six ports: Astoria, Newport, North Bend, Portland, Reedsport, and Tillamook. Records concerning the port of Portland are on file at the National Archives—Pacific Alaska Region (Seattle) and include records of the Immigration and Naturalization Service, Portland Office, and the Portland Collector of Customs. No passenger lists for the port of Portland or the smaller ports have been found at this time.