At the junction of Crystal Springs Road and Skyline Blvd is the trail entrance to Crystal Springs Reservoir. Because both of these streets are really long and winding, please know where yo are going before you drive. From San Francisco you take the Haynes Road/Black Mountain Exit off of 280 and are right at the entrance to Crystal Spring Golf Course. Go left, away from the gold course on Skyline Blvd and our gate/entrance to the trail head is about a mile south.