The collection consists of notes, memoranda, correspondence, speeches, reports, maps, photographs, and records relating to the U.S. Bureau of Reclamation, Central Valley Project, Sacramento-San Joaquin Delta Region, salinity, the Delta hearings, water rights, acreage limitations, the Reber Plan, fish and wildlife, USBR/CVP contracts and leases, floods and flood control, and miscellaneous power and energy issues.

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.

The collection consists of articles, addresses by Hyatt, and clippings, pertaining to dams, water rights, salt water intrusion, hydroelectric power, the California Water Plan, and other aspects of water in California.

This collection consists of Environmental Assessments (EA) and Findings of No Significant Impact (FONSI) for the proposed project sites of the Levee Rehabilitation Project undertaken by the U.S. Army Corps of Engineers (Corps), Sacramento District after area flooding in late 1996 and early 1997.

The collection consists of correspondence and reports concerning the Colorado River and flooding in the Imperial Valley, the Hetch Hetchy Project, Los Angeles water supply, the Southern Sierra Power Company, the salinity of San Francisco Bay and Sacramento-San Joaquin River Delta, flood control and irrigation projects, groundwater, and land appraisal throughout California and other western states.

The collection consists of correspondence, news clippings, memoranda, office files, legal documents, drafts of legislation, and transcripts of hearings. Principal topics include area planning, flood control and drainage, garbage and refuse collection and disposal, sewerage and industrial wastes, water quality management, water resources development (both state and federal), and water supply and distribution.

The collection consists of river restoration project plans for various sites in California.

The collection consists of 14 notebooks that describe contracts and project plans for drainage and channels of Riverside county.

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

The collection consists primarily of speeches by Warne during his tenure as Director of the California Dept. of Water Resources, 1961-1966; also includes miscellaneous correspondence and articles written by Warne during this period.