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n 1760 .Il1jh'I'Jol Prt>lin,innru 10 ('ful.'dru..t;on Huge trucks were needed to haul men. material~, and equipment-some of 16-cuhic yard capacity. others of .=)O-Ion capacity, and still others which were operated as 100- and ISO-man transports. Air compressor plant~ of 1.:1..;500 cubic fef'! per minute capacity \H'I-e buill near the dam !;ite, The ~and and gravel screening and wa~hing plant to provide aggregate was the largest of ils type. It could screen. wash. and place aggregate in readiness for mixture with cement and water at the raIl'" of more than 161,S tons per minute. The dispatch with which the job \\-as ultimately accomplished bears testimony to the efficiency of the planners. And final]y a great number of laborers h"d to be recruited. Even though the effects of the business elf'pression of th{:' t:'arl~ ,'1(Ys re~ultf'd in p:reat numbers of unemployed worke~s, yet it was imperati,'e that a method be B~fnre actual construction of the dam could hegin. much preliminary work had 10 he done in order to insure successful c(Jll1pletion of the gigantic task. \'\?ays and means had to be devised to cope with the rig(lr.~ of a forbiddiIlg desert. Facilities had to be provided for transporting material and equip. ment over miles or burning sand and onto the construction .site-SOO feet helow the sheer wall". of the canyon. It nlu;;.t he: emphasized that all e,;;;.entials had to be planned and created. for t1lf' locale in \\hich the dam was \0 he buill was utterly devoid of any facilities f(,r modern living. Therefore. faulty planning would mean delays in con- struction. if not total failure. of the project. I\no. it \\8S the responsibility of the engineers to plan so well that not the _"lighte.::ot item would be overlooked. The first need was faciliti~ for transportation. The unioll Pacific Hailroad laid a hranch line from Las Vegas to the site of Boulder City. From this point the Bureau of Reclamation built its own railway to the dam site. High. way". had to be built. Also it was necessary to erect machine shops. air compre~snr plant..;. garages, and warehouse~. It was imperative to span the canyon first by bridges and later by aerial cahles. A great gravel screening plant and two huge concrete mixing planb were designed and constructed. It \vas necessary to acquire power draglines and power shovels, truekR, cars, derricb, and cranes in great numbers. It was necessary to bring electric power 222 miles across the desert from San Bernardino, Calif. Living facilities for the const; uctiOTl workers V.ias another maUer which rf'quired earnest thought. There wa" no "labor pool" in the area. and worker" had to be recruited from all parts of the Nation. Homes !lad to be provided fur dlese workers. The ordinary cunstruction camp would not do. Nor could the workers be eXjJected to live in the immediate vicinity of the dam site, {or here the temperatures in summer often rose 10 1300. \,\raves of heat as from a hlast furnace rose from the canyon. After studying climatic and soil conditions in the area, a location for ~ townsite was chosen 7 miles southwest of the dam site. Here, on a high sUlnmit. the Government erected a modern town. l\fodenl homes were built, la\vns and parks were plotted, streets were laid out and paved. ~chools, churches. and stores were erected. A sewer and ~ewagc system was installed. And \vater was piped from the Colorado River 7 miles away. 1n short, a JllOdnll desert oasis was brought into being. Still another matter requiring careful planning was to assure the securing and delivery of materials as needed. Materials were required in quantities never hefore shipped to a single construction joh in so short a tinlc-5,OOO.OOO harrels of cement; 8.000.000 tons of sand. gravel, and cohble~; 45,000.000 pounds of reinforcement steel; 18~OOO,OOO pounds of structural steel; 21.000.000 pOllnds of gates and valves; 840 miles of pipt,. All of these \\pre hauled over the railroads in the first 4 year~ of com.trllctioll. AJ."o. some of the greatest ma5'sing of specialized machinery ever assembled, up to that time, had to be procured. Niggf'r.rodnum I('ilh topography $urrey purly iFf Black C(lrlYO/l 01/ ]\'euula .~itle. f{odmatf is IOlt'ertul on:r Black Ctwya/l rim on ropt! muf gh-es fJohll,.; whidl fire recordetl Kith both hori::o'lwl mul t.errical angle fJY rll'O trall..;il purties. If;