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.

Lake/Reservoir Sites

Field measured streamflow and lake sites - Periodic manual measurements of streamflow and gage height at streamflow and lake sites. These measurements are often used to supplement and (or) verify the accuracy of the time-series measurements. The last value available is shown in the pop-up bubble for each site. Additional data for surface-water sites.

Real-time sites - Current-conditions data transmitted from selected surface-water, ground-water, and lake sites. Values in pop-up bubbles are updated hourly. Additional data for real-time sites.

Data are provisional and subject to revision.