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


This project is a continuing program with a cooperative agreement between the San Bernardino Valley Municipal Water District (SBVMWD) water resources program, and the U.S. Geological Survey (USGS).

The USGS continues to operate and maintain the gaging stations and water-quality monitors in the upper Santa Ana River Basin including precipitation stations. Continuous recording water-level monitors are maintained at eight multiple-depth cluster well sites located in the Bunker Hill Basin and four sites in the Yucaipa Valley. Each of the Yucaipa Valley sites consists of between four to five well casings, with monitoring accomplished by using pressure transducers and electronic data loggers. All sites are equipped to transmit data hourly to NWIS. 

Chemical and isotopic analyses of groundwater samples obtained from the multiple-depth well sites are being used to identify baseline 'native' water-quality conditions. Hydrogeologic technical support will be provided as requested by SBVMWD.

Investigations in the Yucaipa Basin focus on tracking the movement of imported water released into the Wilson Creek spreading ponds.

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Relevance and Benefits

This project focuses on several contemporary hydrologic issues and provides a number of important benefits to the public. For example, it will:

  • Advance knowledge of the hydrologic system in the Yucaipa Valley area. Much of this knowledge will be gained from development and calibration of a linked surface-water and ground-water flow processes.
  • Provide unbiased data and results that will be used by the more than 20 water agencies in the area so that they can better resolve their multiple and continuing water issues.
  • Provide water-resources information that will improve operation of local artificial-recharge basins, ground-water extractions, and ground-water cleanup facilities.
  • Contribute to national databases used to develop and assess global climatological models.