Crystal Springs Reservoir is a reservoir located in the northern Santa Cruz Mountains of San Mateo County. It lies in a rift created by the San Andreas Fault just to the west of the cities San Mateo and Hillsborough and the State highway I-280. The entire reservoir consists of two different reservoir-lakes, split by an earthen dam on which CA-92 crosses the reservoir. The southern reservoir, Upper Crystal Springs Reservoir is dammed by the earth dam. The northern reservoir, Lower Crystal Springs Reservoir is dammed by the massive Crystal Springs Dam. Part of the water in the reservoir comes from local precipitation and the rest piped in from Hetch Hetchy Reservoir in Yosemite. The entire reservoir was built and owned by the Spring Valley Water Company and eventually came under ownership and protection by the city of San Francisco. This local protection has ensured the survival of important species in the area, and a set of trails in Crystal Springs Park allows many to enjoy the scenic beauty of the reservoir and the local wildlife. Gelmersee is a reservoir in Switzerland. ... The Santa Cruz Mountains, part of the Pacific Coast Ranges, are a mountain range in central California. ... San Mateo County is a county located in the San Francisco Bay Area. ... View of the San Andreas Fault on the Carrizo Plain in central California The San Andreas Fault is a geological fault that runs a length of roughly 800 miles (1300 kilometres) through western and southern California in the United States. ... San Mateo, Spanish for Saint Matthew, is the name of several places: San Mateo County, California, United States of America San Mateo, California, United States of America (in San Mateo County) San Mateo, Rizal, Philippines This is a disambiguation page — a navigational aid which lists other pages that might... Hillsborough is a town in San Mateo County, California, in the San Francisco Bay Area. ... Interstate 280 is the designation for several Interstate Highways in the United States, all of which are related to Interstate 80: Interstate 280 (California), a north-south freeway running from San Jose, California to San Francisco, California. ... JUNCTION POSTMILE SR-238 / SR-185 ALA 8. ... Hetch Hetchy Reservoir is a reservoir in Yosemite National Park, about 65 miles east-southeast of the city of Merced. ... Yosemite National Park (pron. ... This page is a candidate for speedy deletion. ... Nestled between the City of San Bruno to the north and Woodside to the south, Crystal Springs is a county park comprised of two main trails, Sawyer Camp Trail in the southern end and San Andreas trail in the northern section, which run along the eastern shore of San Andreas...