Forest Park, passes Pittock Mansion and its panoramic views of Portland and five volcanic peaks: Mounts Rainier, Adams, St. Helens, Hood, and Jefferson. Beyond the mansion, the trail connects to adjoining Washington Park and attractions such as the Oregon Zoo via the Barbara Walker Crossing, a pedestrian bridge over Burnside Street. From here and from more remote Forest Park trailheads near the St. Johns Bridge, other components of the 40-Mile Loop system of trails encircle the city. They follow the Willamette and Columbia rivers, the Columbia Slough and the Springwater Corridor along Johnson Creek and extend to the eastern suburbs of Fairview, Gresham and Boring. This trail network links more than 30 separate parks that offer diverse recreational opportunities, such as horse-back riding, in-line skating, canoeing, and viewing of wetland wildlife, in addition to hiking and biking. It connects to other trail systems such as Discovery Trail in Clark County, Washington, and the Terwilliger Trail running through Tryon Creek State Natural Area to Lake Oswego. As of 2015, this network of parks and trails is still expanding. Metro, the regional government, plans to link the 40-Mile Loop to trails along the Willamette River to Wilsonville, south of Lake Oswego. The regional government has also proposed connecting Wildwood Trail to the partly completed Westside Trail running north–south through Washington County to the Tualatin River. Another planned trail would extend the Springwater Corridor along a proposed Cazadero Trail to Barton on the Clackamas River. Longer-term goals include trail links to the Sandy River Gorge Trail east of Gresham and the Pacific Crest Trail, which runs from Mexico to Canada and follows the Cascade Range through Oregon. Wildwood Trail More than of trails and firelanes cut through the park. The longest trail in the park is the Wildwood Trail, of which about is in Forest Park and about in Washington Park. It is also the longest section of the 40-Mile Loop, a trail network of roughly reaching many parts of the Portland metropolitan area. The trail runs southeast to northwest from trail marker 0 in Washington Park to Northwest Newberry Road, just beyond trail marker 30 on the ridge above the southeastern end of Sauvie Island. The straight-line distance from beginning to end is about , but because the trail includes many switchbacks and hairpin turns, it is long. In 2019, the City of Portland constructed Barbara Walker Crossing to allow Wildwood Trail