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).
Annual Water Data Reports: Water Years 2005-2011
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