The United States of America
Department of Interior
Bureau of Indian Affairs
President of the United States of America
Roy O. West Secretary of the Interior · Hubert Work Secretary of the Interior · Charles H. Burke Commissioner of Indian Affairs · Edgar B. Merritt Ass't Commissioner of Indian Affairs · S.J. Flickinger Chief Irrigation Division · H.V. Clotts Chief Engineer · W.M. Reed Chief Engineer
C.R. Olberg Assistant Chief Engineer in Charge · C.H. Southworth Construction Engineer · H.C. Neuffer Designing Engineer · J.A. Fraps Assistant Designing Engineer · M.R. Trenam Assistant Designing Engineer · E.L. Rose Electrical Engineer · Allan Sickler Assistant Electrical Engineer · R.H. Rupkey Assistant Engineer · K.M. Fisher Instrumentman · Elvin Johnson Chief Inspector · Christian Bottinger Chief Inspector · Bruce Johnston Testing Inspector · C.L. Shotwell Disbursing Agent · John F. Truesdell Counselor
Gen. W.C. Langfitt · A.J. Wiley · F.A. Noetzli · L.C. Hill · Barry Dibble · P.O. Wright Architect
Atkinson, Kier Bros., Spicer Company
Lynn Atkinson - Elmer Kier - Ernest Kier - C.A. Spicer
J. C. Tripp General Superintendent
Charles G. Clapp Asst. Sup't · Huso Festich Excavation Sup't · James F. Hurst Concrete Sup't · F. F. Hassell Steel Placing Sup't · S. S. Atkin Office Manager · F.A. Wright Contractors Eng'r · Johhn C. Moore Carpentry Sup't · Ellis M. Shimiel Gravel Plant Sup't · Ernest Wallin Rigging Sup't · Neil Gibbons Chief Timekeeper H.B. Hulm Auditor
Date Work Commenced - January 1927 · First Concrete Placed - November 24, 1927 · Dam Construction Completed - October 25, 1928 · Elevation of Base of Dam - 2286 · Elevation of Roadway - 2536 · Height Above Bedrock - 250 feet · Reservoir Capacity - 1,200,000 acre feet · Foundation Rock and Spillway Excavation - 317,000 cu. yds. · Total Concrete Placed in Structure - 204,000 cu. yds. · Reinforcing Steel Required - 3,500 tons · Length of Central Buttress at Base - 270 feet · Maximum Span of Domes - 180 feet · Total Overall Length of Structure Including Spillways - 920 ft.
Calvin CoolidgeMarch 4, 1930.