Topographic model of the San Gabriel Dam on top of a white sheet. Related article, "Dam Models Completed: County Flood Control Engineers Have Types of Two Structures Proposed for San Gabriel Canyon," Los Angeles Times, 28 May 1925: 3.
View of the San Gabriel Canyon wall before explosion for the excavation of the San Gabriel Dam. Related "Gigantic Blast Aids Dam Work: Ninety Tons of Powder Used at San Gabriel Side of Canyon Seems Molten Before Explosive Engineering Feat Figured to Exact Result," Los Angeles Times, 27 June 1929: A10.
Photo appears with article "Flood Control Project Inspected: FIRST CONCRETE POURED IN PACOIMA DAM County Supervisors Pull Lever Sending Initial Batch of Mixture to Base of Structure That Will Rise in Year to 395-Foot Height," Los Angeles Times, 06 Aug 1926: A1.
9-foot-high, 4-foot-wide tire. One-of-a-kind 125-ton vehicle that does nothing but push another machine along a rocky canyon floor about 45 miles northwest of Los Angeles. They are part of a fleet of giant earth-moving equipment, mobilized by the Western Contracting Corp. of Sioux Falls, S.D., to work on the monumental Castaic Dam and Reservoir, the southern terminus of the 44-mile California Aqueduct being built in a $2.8 billion State Water Project.