This collection consists of engineering reports on water development in California.

The bulk of the collection represents the work of Fred H. Tibbetts, done under the auspices of his engineering firm, Blackie and Wood, San Francisco, which was the final partnership in a series of professional partnerships which begin in 1909 under the firm name of Haviland and Tibbetts. Blackie had assumed control of the Tibbetts engineering firm at the death of Tibbetts in 1938.

Subjects covered in the collection include irrigation, reclamation, and flood control projects. While most of Tibbetts' most important work was done in the Sacramento Valley, the material which came to the University of California does not include files on some of the major projects in this area. These presumably were kept in the district offices. Neither does the collection include files on the work done for the Santa Clara Valley Water Conservation District.

An index is supplied.