The Wildwood Trail [Portland], designated by the Secretary of the Interior as a National Recreation Trail, meanders for 30.2 breathtaking miles, from the southern end of the trail at the Vietnam Veterans Memorial in Washington Park to the Northwest terminus of the trail at Newberry Road. Starting at the Vietnam Memorial/Oregon Zoo, the trail is marked every quarter-mile by blue, diamond-shaped blazes stenciled onto trees about six feet from the ground. The mile markers are located approximately two feet above the blue diamond, and show the distance from the Zoo/Vietnam Memorial trailhead. The Wildwood enters Forest Park proper when it crosses West Burnside St. at about Mile 3.
The Wildwood Trail has a Strava segment, which indicates that it's more like 26 miles (vs. 30.2 stated above).