Front row, L-R: President Levy, Union Pacific Railroad Company; Emmet D. Boyle, governor of Nevada from 1915-1923; William Sproule of the Southern Pacific Railroad Company; U.S. Senator from Nevada Key Pittman. Second row, L-R: U.S. Senator from Nevada Charles B. Henderson; mining engineer Roy Hardy; Buckley Wells, president of the National Antimony Company (standing with left foot on lower step); Fred Shorfless. Upper row, L-R: Walter Reed; Walter C. Clark (wearing glasses), of the Bunker Hill and Sullivan Mining and Concentrating Company; John M. Fulton of the Southern Pacific Railroad Company; Walter C. Clark; Fred G. Farish, general manager of the Metals Exploration Company. Two unidentified men in the background. Photograph probably taken in Nevada.

Black and white image of the group of men who witnessed the pouring of the first concrete in Hoover Dam proper. From left to right: H. J. Lawler, Director of Six Companies, Inc.; Walker R. Young, Construction Engineer, U.S. Bureau of Reclamation; Frank T. Crowe, General Superintendent, Six Companies, Inc.; C. A. Shea, Director of Construction, Six Companies, Inc. W. A. Bechtel, President, Six Companies, Inc.; R. F. Walter, Chief Engineer, U.S. Bureau of Reclamation; Theodore A. Walters, First Assistant Secretary of the Interior ; Ed Clark & C. P. Squires, members of the original Colorado River Commission. Note: Boulder Dam was officially renamed Hoover Dam in 1947.