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Construction workers lift massive support beams into place as they work on a flyover ramp. Once completed the ramp will allow traffic to flow over 215 the Beltway as they enter from the Airport connector.

Construction workers lift massive support beams into place as they work on a flyover ramp. Once completed the ramp will allow traffic to flow over 215 the Beltway as they enter from the Airport connector.

Construction workers lift massive support beams into place as they work on a flyover ramp. Once completed the ramp will allow traffic to flow over 215 the Beltway as they enter from the Airport connector.

Pg.66 #3136 Close-up of the Arizona Intake Towers - No.6 on left, No.3 on right. Note the forms for the dome of Intake Tower No.6. March 4th, 1935. Pg.66 #3133 View from the Arizona Spillway bridge, looking downstream into No.4 raise, showing general construction methods. Feb. 25th,1935. Pg.66 #3120 Looking downstream from the Arizona side, showing Boulder Dam, the Intake Towers and general layout. Note the dome formed on one of the Intake Towers. Feb. 25th, 1935. Pg.66 #3139 The run-around excavated in the old top heading adit, to facilitate handling concrete for No.4 Plug. March 4th, 1935.