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.

-Oregon State Parks Possibilities

Oregon State Parks possibilities   Oregon State Parks uses “symbols to represent major park features & activities. Blue icons mean some/all are ADA accessible.”  The following parks and recreation areas display the hiker symbol in blue on their website, but there are no descriptions of any accessible trails in the parks’ descriptions , brochures or maps.  You might try calling the parks for clarification.
Collier Memorial State Park  phone 541-783-2471
Crissey Field State Recreation Site  phone 541-469-0224
Fort Yamhill State Heritage Area  phone 503-879-8-5814
Jessie M. Honeyman Memorial Sate Park  phone 541-997-3851
Lewis & Clark State Recreation Area phone 503-695-2261
Prineville Reservoir State Park  541-447-4363
Shore Acres State Park   541-888-3732
Starvation Creek State Park 541-374-8811 or 503-695-2261

The Valley of the Rogue State Park

The Valley of the Rogue State Park
“Valley of the Rogue Park has both a day-use picnic area and an overnight campground along three miles of shoreline on the Rogue River.”  The Rogue River Greenway trail goes four miles through the Park.
Here is the Park website.
541-582-1118  Brochure
HikerwithcaneRiver’s Edge Interpretive Trail is an “…easy, self-guided interpretive walking rail [which] provides a relaxing 1.25 mile stroll along the river’s edge. ”
Wheelchair Accessible     Rogue River Greenway  Most of this trail appears to be paved and relatively flat.  Call 800-541-0925  before you go to be sure the part you plan to travel is accessible.

Tryon Creek State Natural Area

Tryon Creek State Natural Area
Fifteen minutes from downtown Portland, Tryon Creek State Natural Area is 658 acres of second-growth forests and includes meandering Tryon Creek.
Here is the Area’s website.   phone 503-636-9886 Brochure and Map    Trail Map
Wheelchair AccessibleTrillium Trail is 0.37 mile ADA, paved, and has “….resting benches and viewing decks.  Trail features are identified along the way.”
Wheelchair Accessible
There is a short trail with pavers to the Glen Jackson Shelter.

South Beach State Park

South Beach State Park
South Beach State Park is next to the Yaquina Bay Bridge.  It begins in south Newport and stretches several miles down the Oregon coast.
Here is their website.   Phone 541-867-4715  Brochure
Wheelchair AccessibleSouth Jetty Trail is a paved one mile link between the park’s day-use are and south Jetty Road
Wheelchair AccessibleInterpretive Boardwalk a 1/4 mile trail which “…gives all visitors access to the park’s oceanfront dunes and a sweeping view…”

OC and E Woods Line State Trail

OC and E Woods Line State Trail   phone 541-883-5558   Brochure
Wheelchair Accessible This is a 109 mile, rail-to-trail conversion is open to all non-motorized recreation from Klamath Falls , east to  Bly and north to Sycan Marsh.  The paved section is from Klamath Falls to Olene.  Call ahead for up-to-date information on trail conditions and to be sure the section you are interested in is appropriate for you.

Iwetemlaykin State Heritage Site

Iwetemlaykin State Heritage Site
“Short trails with spectacular views of the Wallowa Mountains pass Knight’s Pond, a cool summer oasis and a peaceful respite for hikers. Look for spring and summer wildflowers during your walk. You also may catch glimpses of deer, fox, bear and raptors.”
Brochure   Phone 541-432-4185  Here is their website.
Although the website for this site indicates some accessible hiking, the brochure does not. 
HikerwithcaneThe trail system is less than one mile and judging from the map in the brochure, you could enjoy a nice walk from the South Main Street trailhead.

Ecola State Park

Ecola State Park
Wrapping around Tillamook Head, between Seaside and Cannon Beach, Ecola State Park stretches along 9 miles of coastline and offers outstanding sightseeing and recreation opportunities combined with a storied past.”
Here is the Park website.  Phone 503-436-2844  Brochure  OregonHikers.org
Hikerwithcane? Clatsop Loop Hike is a 3 mile gravel road and I have found some references implying some of it is wheelchair accessible.  However, there is an elevation gain of 700 feet. The first 1/2 mile is not steep, but you need to call ahead to determine trail conditions.