Water Data

Current Real-time Conditions

• Surface water ()
• Ground water ()
• Water quality ()
• Precipitation ()
• NWISWeb Data for California ()

Historical Data:

Annual Data Reports (Water Resources Data series)



2007: searchable () | alphabetical index (pdf) | schematics | discontinued sites
2006: searchable () | alphabetical index (pdf) | schematics | discontinued sites
2005: searchable ()
2004: Volume 1 | Volume 2 | Volume 3 | Volume 4
2003: Volume 1 | Volume 2 | Volume 3 | Volume 4
2002: Volume 1 | Volume 2 | Volume 3 | Volume 4
2001: Volume 1 | Volume 2 | Volume 3 | Volume 4
2000: Volume 1 | Volume 2 | Volume 3 | Volume 4
1999: Volume 1 | Volume 2 | Volume 3 | Volume 4

From 1994 to 1998 records were scanned for the web and listed by county
Discontinued Sites: 1999
Sites by County: 1999, 1998 or 1994-97
Sites by Downstream Order: 1996-2001


Compilation Reports

Below links require the free viewer for djvu files.


1966-70 Compilation

• Water Supply Paper 2126 (Part 9, Volume 3. Lower Colorado River Basin)
• Water Supply Paper 2127 (Part 10. The Great Basin)
• Water Supply Paper 2128 (Part 11, Volume 1. Pacific slope basins from Tijuana River to Santa Maria River)
• Water Supply Paper 2129 (Part 11, Volume 2. Pacific slope basins from Arroyo Grande to Oregon state line except Central Valley)
• Water Supply Paper 2130 (Part 11, Volume 3. Pacific slope basins, Southern Central Valley basins)
• Water Supply Paper 2131 (Part 11, Volume 4. Pacific slope basins, Northern Central Valley basins)


1961-65 Compilation

• Water Supply Paper 1926 (Part 9, Volume 3. Lower Colorado River Basin)
• Water Supply Paper 1927 (Part 10. The Great Basin)
• Water Supply Paper 1928 (Part 11, Volume 1. Pacific slope basins from Tia Juana River to Santa Maria River)
• Water Supply Paper 1929 (Part 11, Volume 2. Pacific slope basins from Arroyo Grande to Oregon state line except Central Valley)
• Water Supply Paper 1930 (Part 11, Volume 3. Pacific slope basins, Southern Central Valley basins)
• Water Supply Paper 1931 (Part 11, Volume 4. Pacific slope basins, Northern Central Valley basins)


1951-60 Compilation

• Water Supply Paper 1733 (Part 9. Colorado River Basin)
• Water Supply Paper 1734 (Part 10. The Great Basin)
• Water Supply Paper 1735 (Part 11. Pacific Slope Basins in California)


1950 Compilation

• Water Supply Paper 1313 (Part 9. Colorado River Basin)
• Water Supply Paper 1314 (Part 10. The Great Basin)
• Water Supply Paper 1315-A (Part 11-B. Pacific Slope Basins in California, except Central Valley)
• Water Supply Paper 1315-B (Part 11-A. Pacific Slope Basins in California, Central Valley)

USGS Data Collection Network

The U.S. Geological Survey currently operates about 440 data collection sites in California for acquiring information on surface-water, ground-water, water-quality, and precipitation. Sites with satellite telemetry provide real-time data via GOES satellites and downlinks, which enables the posting of data to the Web for public dissemination.

Hydrologic data collected by the USGS are published in the 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 server.

In order to help you locate data and reports, we have created Web pages of publications with specific data types.

You can also ask questions and request data or reports from our Public Information Officer.

Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 8.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.