San Francisco Bay Area Ridge Trail

San Francisco Bay Area Ridge Trail
Name	San Francisco Bay Area Ridge Trail
Location	San Francisco Bay Area, California, United States
Length	~400+ miles planned
Established	1989 (organization)
Use	Hiking, Biking, Equestrian, Trail Running

San Francisco Bay Area Ridge Trail is a regional multi-use trail network encircling the San Francisco Bay via ridge lines and open-space corridors across the San Francisco Peninsula, East Bay, North Bay, and South Bay. Conceived as a continuous route connecting parks, preserves, and urban areas, it links municipal, county, state, and federal lands such as Golden Gate National Recreation Area, Point Reyes National Seashore, Muir Woods National Monument, Mt. Tamalpais State Park, and Henry W. Coe State Park. The trail intersects major regional greenways and transportation hubs including Golden Gate Bridge, Bay Bridge, and San Francisco International Airport corridors.

Overview

The Ridge Trail project aims to create a roughly 550–750-mile loop (estimates vary) around the San Francisco Bay, traversing ridgelines across Marin County, Sonoma County, Napa County, Contra Costa County, Alameda County, San Mateo County, Santa Clara County, and Solano County. Managing agencies and partners include the Bay Area Ridge Trail Council, United States National Park Service, California Department of Parks and Recreation, county parks departments such as Marin County Parks, East Bay Regional Park District, and private landowners like the Presidio Trust and conservation organizations such as the Nature Conservancy and Save the Redwoods League. The trail promotes connectivity with public transit nodes like BART, Caltrain, and SMART.

History and Development

The concept was initiated in 1987 and organized through the Bay Area Ridge Trail Council in 1989, influenced by regional planners, activists, and agencies including figures from Sierra Club and land managers from National Park Service. Early milestones involved negotiations with municipal entities like the City and County of San Francisco, county boards of supervisors, and state bodies such as the California Coastal Conservancy. Major acquisitions and easements were secured through collaboration with foundations like the William and Flora Hewlett Foundation, the Packard Foundation, and the Gordon and Betty Moore Foundation, and legislative support intersected with initiatives led by the California State Parks system.

Route and Segments

Segments follow ridgelines, watershed divides, and utility corridors linking open spaces: prominent segments include the Mount Tamalpais ridgeline, the Trails of Mount Diablo, the Las Trampas Regional Wilderness ridges, the Santa Cruz Mountains spine, and the Sweeney Ridge approaches near San Bruno Mountain State and County Park. Connections cross urban areas via parks such as Crissy Field, Buena Vista Park, Presidio of San Francisco, Redwood Regional Park, Shoreline Park (Mountain View), and Coyote Hills Regional Park. The route interacts with transportation crossings near San Francisco–Oakland Bay Bridge and transit hubs like Oakland Amtrak Station and San Jose Diridon Station.

Recreational Use and Access

Users include hikers, mountain bikers, equestrians, and trail runners who access trailheads at regional parks such as Mount Diablo State Park, Point Isabel Regional Shoreline, Billy Goat Hill, and Coyote Point Recreation Area. Accessibility improvements have been undertaken in concert with agencies like California State Coastal Conservancy and disability advocacy groups, and events hosted by organizations including Bay Area Open Space Council and local chapters of the Trail Stewardship Network promote stewardship and volunteerism. Trail etiquette and multi-use policies are coordinated with districts such as Midpeninsula Regional Open Space District and East Bay Regional Park District.

Conservation and Land Management

Conservation priorities along the Ridge Trail engage agencies and nonprofits such as National Park Service, California State Parks, Land Trust of Santa Cruz County, Marin Agricultural Land Trust, and Sempervirens Fund to protect habitat for species associated with the California chaparral and woodlands and remnant coastal prairie and oak woodland ecosystems. Fire management and fuels reduction plans involve collaboration with Cal FIRE and local fire safe councils; watershed protection efforts align with districts such as the Santa Clara Valley Water District and Marin Water. Land acquisitions, conservation easements, and resource management plans rely on partnerships with The Trust for Public Land and county parks commissions.

Trails and Connections

The Ridge Trail interfaces with a wide network of regional, state, and national pathways: intersecting routes include the California Coastal Trail, the Bay Trail, Pacific Crest Trail (via regional connectors), and local systems such as the Iron Horse Regional Trail, San Francisco Bay Trail, Coyote Creek Trail (Santa Clara County), and the Las Gallinas Valley Sanitary District corridors. It provides linkages to transit via BART, Caltrain, ACE (Altamont Corridor Express), and ferry terminals like San Francisco Ferry Building and Oakland Ferry Terminal, enhancing multi-modal access.

Notable Features and Landmarks

Key landmarks along ridge alignments and adjacent preserves include Mount Tamalpais State Park, Angel Island State Park, Alcatraz Island, Mount Diablo State Park, Redwood Regional Park, Point Reyes National Seashore, San Bruno Mountain State Park, the Golden Gate National Recreation Area, and cultural sites such as Chabot Space and Science Center and historic ranches preserved by the National Trust for Historic Preservation. Iconic vistas incorporate perspectives of San Francisco Bay, Pacific Ocean, Sierra Nevada (distant), and urban skylines of San Francisco, Oakland, and San Jose.

Category:Hiking trails in California Category:Protected areas of the San Francisco Bay Area