California Water Science Center (CAWSC) - Yucaipa Valley Optimal Basin Management (OBM)

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Yucaipa Valley Hydrogeology

Welcome to the U.S. Geological Survey (USGS) Yucaipa Valley Hydrogeology website. This site provides hydrologic data collected or compiled by the USGS in the Yucaipa area; some additional data may be available from the USGS database National Water Information System (NWIS).

Project Chief: Greg Mendez
Phone: 619-225-6176

Study Area Map

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The study area extends from the San Andreas Fault in the north to the San Timoteo wash in the south, and from the Crafton Hills in the west to the hills east of Yucaipa. Between the hills and mountains is a gently sloping area of unconsolidated deposits, commonly referred to as the Yucaipa plain. On the northwest side, the plain merges into the San Bernardino valley, and on the southeast side, the plain opens to the San Gorgonio Pass. The Yucaipa plain ranges in altitude from about 1,800 to 3,600 ft above sea level and surrounded by hills and mountains that range in altitude from about 3,000 ft in the Crafton Hills, to 5,000 ft along the ridge of the hills east of Yucaipa, to more than 8,000 ft in the San Bernardino Mountains.