San Diego Hydrogeology

Welcome to the U.S. Geological Survey (USGS) San Bernardino Optimal Basin Management website. This site provides hydrologic data collected or compiled by the USGS for the San Bernardino area. Also provided is a comprehensive listing of reports, including links to online reports. Please use the San Diego Hydrology navigation links located above to access project overview, maps, figures, data, references, and contacts.

Real-Time Precipitation Sites

Real-time sites - Current-conditions data transmitted from selected precipitation sites. Values in pop-up bubbles are updated hourly. Additional data for real-time sites.

Data are provisional and subject to revision.