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1. Lower portals of Diversion Tunnels No. 3 and No. 4, during the flood.
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2. Looking across the river at the lower portal of Diversion Tunnel No. 3.
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3. Gas-air shovel caught in the flooded Colorado River
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4. Partially washed-out truck bridge across from diversion tunnels
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5. Dragline loading gravel
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6. Dragline loading gravel into side-dump car
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7. Trash rack structure being installed in front of diversion tunnel no. 2
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8. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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9. Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the...
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10. Workers and drilling jumbo inside diversion tunnel no. 4
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11. Close-up of workers using a drilling jumbo inside a diversion tunnel
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12. Construction worker in bulldozer in front of diversion tunnel portal
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13. Worker inside drill sharpening station
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14. Construction of the highway which will cross the top of the dam
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15. Looking downstream on the Colorado River running through Black Canyon prior to construction of Hoover...
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16. Construction workers using a drilling jumbo inside a diversion tunnel
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17. Screened aggregate and sand in front of the gravel plant
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18. Night view of the gravel plant
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19. Electric shovel loading rocks into dump truck
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20. Worker sitting in dump truck being loaded by power shovel
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21. Dump truck unloading debris during construction of muck disposal road
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22. Invert concrete pouring forms inside diversion tunnel
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23. Gantry crane inside diversion tunnel no. 3
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24. Invert forms inside diversion tunnel no. 3
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25. Blasting in the walls of Black Canyon for intake tower construction
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26. Concrete lining inside diversion tunnel no. 2
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27. Concrete side wall lining in diversion tunnel no. 3
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28. Side-wall jumbo inside diversion tunnel
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29. Construction of steel forms for the lining of the diversion tunnels
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30. Steel form for diversion tunnel lining being hoisted into Black Canyon
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31. Steel form for diversion tunnel lining being hoisted over the Colorado River
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32. High scalers preparing anchorages in Black Canyon
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33. Construction workers with electric light reflectors standing by a truck in Black Canyon
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34. Future Hoover Dam reservoir area seen from Black Canyon
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35. Detail of a sidewall jumbo inside diversion tunnel no. 3
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36. Detail of side-wall jumbo inside diversion tunnel
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37. Section of a concrete-pouring jumbo standing outside of a diversion tunnel
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38. Dragline loading gravel into railroad side dump cars
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39. Man standing on trestle bridge on the Colorado River pointing at anchoring cables
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40. High scalers on the Nevada side of Black Canyon
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41. High scalers on the Nevada side of Black Canyon above the Colorado River
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42. Close-up of construction workers rigging a cableway over the Colorado River
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43. Construction workers on cableway transport over the Colorado River
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44. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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45. Dumping materials at temporary pile bridge to complete diversion of the Colorado River.
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46. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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47. Panoramic view of the Upper Cofferdam, looking downstream
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48. Concrete pouring forms in the Hoover Dam construction site in Black Canyon
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49. Cut-off trench at upstream side of Hoover Dam.
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50. Concrete pouring forms below a cofferdam in the Hoover Dam construction site
 

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