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<br />Completed tunnel lining at intake portal of diversion tunnel No.4. looking
<br />toward entrance. Pressure for grouting jumbo seen in operation.
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<br />devised to select properly the type of men required. These facilities were
<br />provided also.
<br />The Government and contractors employed 5,250 men, at construction peak,
<br />with a gross monthly pay roll of more than $750,000. The workmen ate at a
<br />mess hall with a capacity of handling 1,300 men at one time. Single men
<br />were charged $1.60 a day for meals, room and transportation to and from
<br />the canyon. Married men rented modern homes from the contractor at $15
<br />to $50 a month unfurnished.
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<br />The general plan of attack in building Hoover Dam was to drill tunnels
<br />through the canyon walls around the site, to divert the Colorado through the
<br />tunnels, build cofferdams to block off the river from the dam site, excavate
<br />the site, and build the dam and power plant.
<br />The narrowness of the canyon, the spread of activity up and down the river,
<br />and the possible large fluctuation of the river's flow made the job of diverting
<br />the Colorado a ticklish one.
<br />It had been decided to drive four diversion tunnels (two on each side of the
<br />river) around the dam site through the solid rock of the canyvn walls. Two
<br />temporary cofferdams would then be built-one would be upstream, above
<br />the site but just below the tunnel inlets; the other would be downstream, below
<br />the site hut just above the tunnel outlets. These cofferdams would block off
<br />the river so that the site could be pumped dry and. excavated to foundation
<br />bedrock.
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