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San Francisco Watershed - the Bay Area Ridge Trail Route Professional Review and Guide
"The 15-mile linear valley running through the Watershed was formed over the millennia by movements along the San Andreas Fault. For perhaps thousands of years before the coming of the Spanish this valley was the site of Native American villages. From then until the dams were built, it was a place of small, fertile farms and a few inns. The Crystal Springs Hotel, built in 1855, a popular spa of its day, gave the lakes their name."
--Jean Rusmore, Betsy Crowder, Frances Spangle, & Sue LaTourrette, Peninsula Trail: Hiking & Biking Trails on the San Francisco Peninsula (Wilderness Press).
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