40-Mile Loop

40-Mile Loop
Name	40-Mile Loop
Location	Portland metropolitan area, Oregon
Designation	Urban greenway trail network
Length	Approx. 40 miles
Use	Hiking, biking, equestrian, walking
Established	Early 20th century (concept), formalized mid-20th century
Difficulty	Easy to moderate
Season	Year-round

40-Mile Loop is a regional greenway and trail network encircling the Portland metropolitan area, connecting parks, rivers, reservoirs, and neighborhoods in Multnomah, Washington, and Clackamas counties. Conceived as a visionary urban planning project, the Loop links municipal, county, state, and federal lands to create continuous multiuse pathways that intersect landmarks, conservation areas, historic sites, and recreational destinations. The project weaves transportation, landscape architecture, and conservation to form a corridor that intersects major roads, transit lines, and waterways.

History

The idea originated with landscape architect Frederick Law Olmsted influences evident in early Oregon planning alongside figures such as William Ladd, John Charles Olmsted, and urban advocates active with organizations like the Olmsted Brothers firm, the City of Portland (Oregon), and the Metropolitan Service District (Oregon). Early twentieth-century efforts drew comparisons to the park systems of Boston, New York City, and Chicago, and were influenced by federal initiatives under the National Park Service and conservationists such as John Muir and Gifford Pinchot. Mid-century momentum involved collaborations among the Portland Parks & Recreation, Multnomah County, Washington County (Oregon), and civic groups including the Oregon Historical Society and local chapters of the Sierra Club. Legislative and ballot measures engaged the Oregon State Legislature and regional planning bodies like the Metropolitan Council (Oregon) to secure easements, funding, and land acquisitions. Prominent local activists and planners from institutions such as Portland State University and the University of Oregon contributed studies that aligned with national programs like the Tennessee Valley Authority conservation ethos and federal urban policy initiatives under presidents from Theodore Roosevelt to Franklin D. Roosevelt.

Route and Design

The Loop's alignment follows natural corridors such as the Willamette River (Oregon), the Columbia River, the Sandy River, and Sullivan's Gulch, while connecting reservoirs like Council Crest Park and waterworks near Mt. Tabor Park. The design team historically referenced precedents from the Emerald Necklace (Boston), the High Line (New York City), and regional greenways such as the Schuylkill River Trail and Minneapolis Grand Rounds. Route planning required coordination with transportation agencies such as TriMet, Oregon Department of Transportation, and municipal bureaus, as well as utility stakeholders like Portland General Electric. Civil engineers and landscape architects compared approaches from projects involving the U.S. Army Corps of Engineers, the Bonneville Power Administration, and regional floodplain management exemplified by the U.S. Fish and Wildlife Service.

Parks and Attractions

The Loop links major parks and cultural sites including Washington Park (Portland, Oregon), Forest Park (Portland, Oregon), Hoyt Arboretum, Japanese Garden (Portland, Oregon), Oregon Zoo, Powell's Books neighborhood routes, and waterfront destinations along the Tom McCall Waterfront Park. It connects historic districts and institutions such as Pittock Mansion, Lan Su Chinese Garden, Oregon Museum of Science and Industry, and communities near Pearl District (Portland, Oregon) and Sellwood-Moreland. Natural attractions on or near the Loop include the Willamette Narrows, riverfront wetlands associated with the National Audubon Society, and habitat restorations with partnerships involving the The Nature Conservancy and Oregon Parks and Recreation Department.

Management and Maintenance

Stewardship is shared among municipal agencies like Portland Parks & Recreation, county entities such as Multnomah County (Oregon), state bodies including the Oregon Parks and Recreation Department, and federal partners like the U.S. Fish and Wildlife Service. Nonprofit partners and advocacy groups—Friends of Trees, Greenbelt Land Trust, The Trust for Public Land, and local chapters of the Sierra Club—contribute volunteer labor, fundraising, and easement negotiations. Funding mechanisms have involved ballot measures, metropolitan taxes administered by entities such as the Metro (Oregon regional government), grants from foundations like the Meyer Memorial Trust, and federal programs administered by agencies including the National Endowment for the Arts for public art installations and the Federal Highway Administration for trail-adjacent infrastructure. Maintenance practices draw on standards developed by professional associations like the American Society of Landscape Architects and coordination with emergency services including the Portland Fire & Rescue.

Recreation and Usage

Users include cyclists affiliated with groups like PeopleForBikes, runners and clubs associated with Nike, Inc. local teams, equestrians, and walking and birdwatching communities organized through organizations such as the Audubon Society of Portland. Events on Loop segments have been coordinated with cultural festivals involving institutions like the Oregon Shakespeare Festival touring initiatives and marathon organizers from organizations such as the Portland Marathon and regional trail running series. Commuter usage ties into transit hubs served by Portland Transit Mall and light rail lines by TriMet, facilitating multimodal trips connecting workplaces at centers like Downtown Portland (Oregon), Oregon Health & Science University, and campuses of Portland State University and Oregon Health & Science University.

Future Plans and Development

Planned expansions and enhancements reference regional plans from Metro (Oregon regional government), active capital projects financed through measures supported by the Oregon State Legislature, and resilience planning aligned with agencies such as the Federal Emergency Management Agency. Proposals emphasize habitat restoration in collaboration with The Nature Conservancy and the U.S. Fish and Wildlife Service, multimodal accessibility upgrades coordinated with TriMet and the Oregon Department of Transportation, and community engagement led by nonprofits like The Trust for Public Land and Friends of Trees. Long-range ambitions echo national precedents set by initiatives such as the Rails-to-Trails Conservancy conversions and urban greenway strategies developed by cities including Portland, Oregon, Seattle, San Francisco, and Denver.

Category:Trails in Oregon Category:Parks in Portland, Oregon