Multnomah County Poor Farm admissions register index (transcribed). This file is a 500+ page 160 MB PDF so be patient; it will take a moment or so to download. The PDF is not searchable. Below is a snapshot of page one.

Roughly 22,250 entries are listed in this document, people sentenced to live and labor at multiple poor farms, from 1861 to the mid-1970s. Many were people with addiction, alcoholism, mental illness, and other disabilities.

https://en.wikipedia.org/wiki/Multnomah_County_Poor_Farm – Wikipedia entry