Silver Falls State Park

Silver Falls State Park
Most of the trails in this Willamette Valley park, known for its waterfalls, are moderate to difficult.  Here is a description from Oregon.com.
Trail Guide and Brochure    Park phone 503-873-8681  Park Map    Maps of the Trail of Ten Falls and of the South Falls Day-use Area.
South Falls Loop   1 mile.  The website 7 Most Beautiful Hikes in Oregon describes this trail as “super accessible for families and even those traveling with a stroller.”  AllTrails says it is “good for all skill levels.”  However, other sources describe it as steep and slippery.  Call first.
Wheelchair Accessible?  There is 4 mile “mostly paved” bike path loop with rolling hills.  You might call the park to see if any part of this path would be usable for a wheelchair.