The California Water Code requires the Department to publish an update of the California Water Plan every five years. The Bulletin 160 series evaluates water supplies and assesses agricultural, urban, and environmental water uses to quantify the gap between water supplies and uses.

Bulletins Bulletin 160-05, published December 2005 Bulletin 160-98, published November 1998 Bulletin 160-93, published October 1994 Bulletin 1, published 1951 (.pdf, 80 MB) Bulletin 25, published 1930 (.pdf, 5 MB) Irrigation of Twelve Million Acres in the Valley of California , published 1919 (.pdf, 0.5 MB)

Annual Reports 1998 Annual data and beyond, refer to the appropriate Water Plan Update. 1995 (.pdf, 1 MB) 1994 (.pdf, 1 MB) 1993 (.pdf, 1 MB) 1992 (.pdf, 1 MB) 1991 (.pdf, 1 MB) 1990 (.pdf, 2 MB) 1989 (.pdf, 1 MB) 1988 (.pdf, 2 MB) 1987 (.pdf, 2 MB) Please Contact Us for copies of annual data that is not in an electronic format .