I just found information about a program called Museums for All.  This program provides lower cost admission to participating museums for people on any type of public assistance.  Bring your EBT card and a photo ID.  Actual admission cost will vary but should be $3 or less per person.  Check individual museums for specifics. 
Oregon Participating Museums
- Fort Dalles Museum and Anderson Homestead
 (The Dalles, OR)
- High Desert Museum
 (Bend, OR)
- Museum of Natural and Cultural History
 (Eugene, OR)
- Oregon Historical Society
 (Portland, OR)
- Portland Children's Museum
 (Portland, OR)
- Schmidt Historical House Museum
 (Grants Pass, OR)
- Science Factory
 (Eugene, OR)
Washington Participating Museums
- Children's Museum of Tacoma
 (Tacoma, WA)
- Imagine Children's Museum
 (Everett, WA)
- KidsQuest Children's Museum
 (Bellevue, WA)
- Museum of History and Industry (MOHAI)
 (Seattle, WA)

