View overlooking Cherry Springs Pond, the origin of Cherry Springs Creek, a tributary to Hicks Creek, and thence to Guadalupe Creek
Sierra Azul Open Space Preserve is managed by the Midpeninsula Regional Open Space District in Santa Clara County, California.[1] It is approximately 19,300 acres (7,800 ha) in area. The preserve is named for the Sierra Azul or "Blue Mountains", the name the colonizing Spanish used for the half of the Santa Cruz Mountains south of today's California Highway 17.[2][3][4]
The park features the peaks of Mount Umunhum 3,486 feet (1,063 m),[5] Mount Thayer 3,478 feet (1,060 m),[6] and El Sombroso peak 2,999 feet (914 m).[7] El Sombroso is about 2 miles (3.2 km) north by northeast of Mount Umunhum.[8] Trails connect from Lexington Reservoir, on the western edge of the park, to Hicks Road on the eastern edge.
The preserve protects the upper watersheds of two important tributaries of the Guadalupe River. The upper headwaters of Los Gatos Creek originate just south of Loma Prieta, wrapping around the preserve on the western side before emptying into Lexington Reservoir. Guadalupe Creek originates just east of Mount Umunhum and flows into Guadalupe Reservoir then follows Hicks Road as it wraps around the eastern side of the preserve.
Parts of Sierra Azul Open Space Preserve are not yet open to the public, but many sections are, and these include miles of trails, old roads (some paved, some not), a man-made lake, and other amenities. The terrain varies from wooded creek canyons to chaparral hills with views to open meadows.
^"Sierra Azul". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
^Erwin Gustav Gudde (1960). California Place Names: The Origin and Etymology of Current Geographical Names. University of California Press. p. 18. Retrieved 2014-07-26.
^John Hunter Thomas (1991). Flora of the Santa Cruz Mountains of California: A Manual of the Vascular Plants. Stanford University Press. p. 5. ISBN 978-0-8047-1862-2. Retrieved 2014-07-26.
^Luther A. Ingersoll (1893). Henry D. Barrows (ed.). A memorial and biographical history of the coast counties of Central California. Lewis Publishing Company. p. 190. Retrieved 2014-07-26.
^"Mount Umunhum". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
^"Mount Thayer". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
^"El Sombroso". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
^David L. Durham (2001). Durham's Place Names of the San Francisco Bay Area: Includes Marin, San Francisco, San Mateo, Contra Costa, Alameda, Solano & Santa Clara Counties. Word Dancer Press.
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