California Delta plans from
1850's through the 1980's
On this page you will find links to pdfs or
maps produced by the agencies as noted . These are the ones we found
easily online. There are many other studies, as indicated by the table
references and bibliographies of the reports. From the reports it
seems the state and Federal agencies only got involved with protecting Delta
levees starting in the 1930's, for the purpose of directing fresh water to
canals to send to Southern California.