Fifield-Cahill Ridge Trail
12.7 miles     1700 ft
3 Sep 2011

A 13-mile section of Bay Area Ridge Trail that can be hiked only by prior registration with SFWater.

Location: Fifield-Cahill Ridge TrailSweeney Ridge

Elevation Profile
Trip Planning

Trail Maps

» Official Brochure: Good map showing various trails.

» Official Trail Map: Good map showing various trails.


Route in brief: From Sneath Lane trail head, follow Sneath Lane (paved) → Sweeney Ridge Trail → Fifield-Cahill Ridge Trail to Skyline Quarry parking lot on Highway 92.


  1. The hike may be done only by registering at SFWater Website.
  2. The first three miles are in Sweeney Ridge: Trail map for Sweeney Ridge.
  3. Restrooms are available at Skyline Quarry trail head and every two miles along Fifield-Cahill Ridge Trail (at mile markers 9.75, 8.00, 5.75, 4.00 and 2.00). No restrooms available at Sneath Lane trail head. The first restroom from Sneath Lane trail head is 3.25 miles into the hike.
  4. No water is available throughout the hike.
  5. The route is described in detail at EveryTrail.

Start Location

Location: 3700 Sneath Lane, San Bruno, CA 94066 . Parking area is visible in Google Maps if you zoom in sufficiently.

Directions: From I-280, take exit 43B for Sneath Lane exit. Drive about two miles to reach a cul-de-sac.

Google Maps:

Parking Fees: None (last visited: May 2010)

Capacity: About ten cars can be parked to the gated entrance on Sneath Lane. Additionally, there is plenty of street parking in residential areas along Sneath Lane.

Latitude: 37.619400     Longitude: -122.454123

End Location

Location: Intersection of Skyline Quarry Road & Highway 92 . Parking area is visible in Google Maps if you zoom in sufficiently.

Directions: Drive westbound on CA-92 crossing under I-280. Remain on CA-92 crossing over the Crystal Springs Reservoir, half mile to the Skyline Quarry gate (painted silver). The gate is on the north side of Highway 92 and is signed "Skyline Quarry". The gate is near a blue call box. The door is normally closed. When guided hikes along Fifield-Cahill Trail are organized by park authorities, the gate is opened to let cars in.

Google Maps:

Parking Fees: None (last visited: September 2011)

Capacity: Several cars may be parked inside

Latitude: 37.505212     Longitude: -122.358304

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