Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted. For more information, please see www.doi.gov/shutdown.
Hydrologic data collected by the USGS is published in annual hydrologic data reports for California, or in interpretive reports. Most of the data are also available on the Web through the USGS National Water Information System (NWISWeb).
Each Water-Year Summary for California will be available on-demand as soon as the water-year data are reviewed and approved as final. To retrieve modern Water Year Summaries, please follow these steps:
Water Resources Data reports were published annually for many decades for use by engineers, scientists, managers, educators, and the general public. These static archival products supplemented direct access to current and historical water data provided by the National Water Information System web interface (NWISWeb), the authoritative source for USGS water data.
|Year||Volume 1: Colorado River Basin, Southern Great Basin from Mexican Border to Mono Lake Basin, and Pacific Slope Basins from Tijuana River to Santa Maria River||Volume 2: Pacific Slope Basins from Arroyo Grande to Oregon State Line except Central Valley||Volume 3: Southern Central Valley Basins and The Great Basin from Walker River to Truckee River||Volume 4: Northern Central Valley Basins and The Great Basin from Honey Lake Basin to Oregon State Line||Groundwater Data for California|
|Year||Volume 1: Colorado River Basin, Southern Great Basin and Pacific Slope Basins excluding Central Valley||Volume 2: Northern Great Basin and Central Valley||Groundwater Data for California||Water Quality Records|
Additional reports and information can be found the USGS Publications Warehouse - Keyword search: California Water Science Center publications. Data and reports can also be requested from our Public Information Officer.
Document Accessibility: Part or all of these reports are presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view. Download the latest version of Adobe Reader, free of charge