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<br />II <br /> <br /> <br />.:j(! <br /> <br />~';-,'~ , c <br />.o~.,;> <br />~-.,.. ."'i., <br />" ,... w <br />, <br /> <br /> <br />-,j<. <br /> <br /> <br />""'",;". <br /> <br />~. <br /> <br />~ <br /> <br />$!~ <br />~o <br />%; <br />~~ <br />2" <br />~~ <br />h <br /> <br />y-' <br /> <br />~ ~ <br /> <br />-< <br />W <br />~ <br />I, <br />?" <br />o <br />t W <br />z <br /> <br />~?' ....1 <br />1 <br /> <br />"" <br /> <br />f <br /> <br />,. <br /> <br />~ <br /> <br />"-~ <br /> <br />I' <br />I! <br />:t <br />I <br /> <br />~ <br /> <br /><-., 'Q ~ !__V~, <br />4:' \. :.i <br />, '~, - n' ~._ ~-'" _~:;- <br />,i:!l<l"'....~,liIl""_;: '" <br />.,..,-':c..i..'.... ',"',: <br /> <br />~ <br /> <br /> <br /> <br />~' <br />...'r, ~ <br />III ."' <br /> <br />_T>- <br /> <br />~'i"-~;;" <br />/Q'-"',r;; <br /> <br />< <br /> <br />-,,<;' <br /> <br />, <br /> <br />Completed tunnel lining at intake portal of diversion tunnel No.4. looking <br />toward entrance. Pressure for grouting jumbo seen in operation. <br /> <br />> <br />. <br />. l" <br />~ <br />~ ~ <br />0: 0. <br />w <br />. " <br />z Z <br />0 <br />N <( <br />" <br />. --' <br /> 0.. <br /> <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. <br /> <br />, <br />, <br />\ <br /> <br /> <br /> ~ <br /> , <br /> " <br /> 0 <br /> , <br /> . <br /> ~ <br /> in . <br /> " ~ <br /> , <br /> . ~ <br /> 8- <br />> <br />4 <br />. <br />~ 0 <br />~ <br />" 0 <br />w 0 <br />. " <br />0 E <br />~ ~ <br />w <br />z <br /> <br />PIn" 01 .4-ttael, <br /> <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. <br /> <br />~ <br />Z <br />o <br />l\l <br /> <br />z <br />o <br />0; <br />" <br />w <br />> <br />o <br />" <br />~ <br /> <br />- <br />0:; <br />< <br /> <br />~ <br />~ <br /> <br />18 <br /> <br />~ <br /> <br />-. <br />, <br />o <br />" <br />o <br />o <br />g <br />; ~ 1'f~ <br />q e:9J..t, <br />.Il' <br />., - <br />: I;'~ <br />~i {.!;~ <br /> <br />~~ ~: ..J~! <br />~ ~~-~ ~~.:lr <br />· ..~ rk ,:)5;' <br />j ~", l,,>~,f- <br />~ ~ "j~ H{~ <br />~ ffi:, >,;.~~ <br />o ~ ,l_:Y <br />N ~ ...:C '..Ji <br />~ /<>li'~ <br />>"',/ :' <br />-.,1 / 'f <br />, <br />'. <br /> <br />ji <br />8. <br /> <br />0; <br />, <br /> <br />~ <br /> <br />o <br /> <br /> <br />" <br />o <br />o <br />" <br /> <br />] <br />o <br />'g <br /> <br />, <br />I",' <br />, <br />, .. <br />ati'.........' <br />" "f:r' <br />2 - ,.-. <br />~ ,'\' <br />~ . <br /> <br />~ <br />0_-' <br /> <br />n <br /> <br />1761 <br /> <br />~ <br />~ <br /> <br /> C/) <br /> ~ <br /> a:: <br /> 0 <br /> 3: <br /> ~ <br /> z <br />z <l: <br />0 z <br />i= w <br />0 ~ <br />w a:: <br />(/) => <br />--' a. <br /><( a. <br />z <l: <br />Ci 0 <br />::> <br />f- Z <br /><.0 <l: <br />z <br />0 ::::E <br />--' <br /> <l: <br /> Cl <br /> a:: <br /> w <br /> > <br /> 0 <br /> 0 <br /> :r: <br /> <br />19 <br />