The collection consists of correspondence, reports, hydrological data, maps and memoranda pertaining to reservoirs, canals, water delivery systems, flood control and irrigation projects, water supply and land appraisals throughout California and southern Oregon, with particular reference to units of the Central Valley Project.

This collection contains newspaper clippings, articles, and other material on the history of the Gage Canal, the system built in 1898 to supply water to the city of Riverside, California. Materials in the collection cover the sale of the Gage Canal company, various lawsuits and legal issues, and correspondence and photographs belonging to John M. Mylne, the superintendent and engineer of the Gage Canal System.

Materials from Walter L. Huber related to water infrastructure in California and the western United States. Materials include reports, correspondence, and photographs.