Las Vegas Sun

May 6, 2024

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Hoover Dam - Construction

UNLV Special Collections

Workers smile for the camera in this picture showing a truck-mounted drill. The drill is used in the upper portion of the diversion tunnels. The diversion tunnels redirect the Colorado River around the construction site. Four tunnels are drilled, two on the Nevada side and two on the Arizona side. All are 56 feet in diameter and have been sealed since construction completed.