Historical Water Data
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).
2014-present: Water Year Summaries
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:
- Visit the USGS Water Data for California page on NWISWeb. Several search options are available from there, including a 'Current Conditions' list of active real-time sites and the NWIS Mapper.
- The various search options will help you find individual sites.
- Once at the site page, select "Water-Year Summary" from the 'Available data for this site' pull-down menu.
For example, Site 07300000 water-year summary
Annual Water Data Reports: Water Years 2005-2013
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.
Hydrologic Data Reports by Volume: Water Years 1975-2004
Hydrologic Data Reports by Volume: Water Years 1961-1974
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