Sweeney Ridge
Two histories share Sweeney Ridge. In 1769, scouts from the Portola expedition climbed to the summit and became the first Europeans to see San Francisco Bay, a discovery that would reshape the continent. Two centuries later, the U.S. military built the SF-51C Nike missile control facility on the same ridge, part of the ring of nuclear-armed antiaircraft missiles that defended the Bay Area during the Cold War. The missile site is abandoned now, its buildings slowly decaying. The view that changed history has not changed at all.
The Discovery Ridge
The San Francisco Bay Discovery Site sits at the summit of Sweeney Ridge, where a marker commemorates the Portola expedition's November 4, 1769, sighting. The scouts had actually reached the ridge a few days earlier, on November 1, but the full party climbed to see the bay on the 4th. The site holds dual designation as a California Historical Landmark and a National Historic Landmark. From the 1,200-foot summit, the view encompasses San Francisco Bay to the east, the Pacific Ocean to the west, and on clear days the distant profiles of Mount Tamalpais and Mount Diablo. The ridge is part of the Golden Gate National Recreation Area.
Nike Missiles and Northern Coastal Scrub
The abandoned SF-51C Nike missile facility sits along the ridge trail, a collection of concrete structures and bunkers that once housed the guidance and tracking equipment for Nike Ajax and Nike Hercules missiles. During the Cold War, these systems were prepared to intercept Soviet bombers approaching San Francisco. The facility was decommissioned as the missile threat evolved, and the buildings have been left to weather. The contrast with the landscape is striking: coyote bush, yellow bush lupine, and California yerba santa grow 6 to 8 feet high through the coastal scrub, and the ridgetop supports California coastal prairie with patches of Douglas iris. The Golden Gate Raptor Observatory considers the ridge one of the Bay Area's best lookouts for spring northbound raptor migration.
Four Trails to the Top
Hikers reach Sweeney Ridge from multiple access points. On the Pacifica side, the Mori Ridge Trail starts from the Shelldance Nursery site, and the Baquiano Trail begins at the east end of Fassler Avenue. From San Bruno, access is available from Skyline College parking lots and via a paved trail from the end of Sneath Lane. The Sneath Lane route offers a two-mile walk up a fenced hardtop road through dense scrub, emerging onto the ridgetop's open grassland. Wildlife includes hawks, deer, coyotes, and mountain lions. The ridge is a 25-minute drive from downtown San Francisco but feels like a different world -- wind-blasted, grassy, and empty except for hikers and raptors riding the thermals.
From the Air
Located at 37.61°N, 122.46°W between San Bruno and Pacifica. The ridge rises to 1,200 ft and is a prominent terrain feature. The abandoned Nike missile facility structures may be visible at the ridgetop. San Francisco International (KSFO) is approximately 4 nm east. Best viewed in clear conditions when both ocean and bay are visible from the ridge.