The collection consists of correspondence, reports, photographs, and miscellaneous material, relating to various bridges, dams, water supply systems, and hydroelectric power installations in California, including the Hetch Hetchy Project, the Los Angeles Aqueduct, the Golden Gate Bridge, the San Francisco-Oakland Bay Bridge, and to electrical distribution systems in California and British Columbia.

The collection consists of correspondence, reports, photographs, and miscellaneous material, relating to various bridges, dams, water supply systems, and hydroelectric power installations in California, including the Hetch Hetchy Project, the Los Angeles Aqueduct, the Golden Gate Bridge, the San Francisco-Oakland Bay Bridge, and to electrical distribution systems in California and British Columbia.