1. Crews and equipment in Black Canyon at dam site
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2. Gas-air shovel caught in the flooded Colorado River
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3. Interior of spillway tunnel, Hoover Dam site
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4. Men operating heavy equipment at Hoover Dam site.
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5. Worker operating heavy equipment at Hoover Dam site.
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6. Equipment at Hoover Dam site
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7. Men operating heavy equipment at Hoover Dam site.
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8. Crew operating construction equipment at Hoover Dam site
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9. Hoover Dam construction -- transporting equipment
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10. Hoover Dam construction equipment
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11. Construction equipment -- Hoover Dam
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12. Hoover Dam construction equipment
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13. Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam.
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14. Construction of Hoover Dam
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15. Hoover Dam construction site, looking upstream
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16. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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17. Hoover Dam site, looking upstream
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18. Crane transporting mixers in diversion tunnel at Hoover Dam site
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19. Hoover Dam site, looking downstream
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20. First concrete in Hoover Dam
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21. Hoover Dam, looking upstream
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22. Hoover Dam, looking downstream
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23. Hoover Dam construction, looking upstream
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24. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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25. Sidewall concreting inside diversion tunnel no. 4
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26. Sidewall concreting in diversion tunnel no. 4 showing workers
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27. Penstock tunnel piping
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28. Concrete pouring forms on the Hoover Dam construction site seen from downstream
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29. Concrete pouring forms and construction on the intake towers at Hoover Dam
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30. Union Pacific Streamline train at the dam site
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31. Hoover Dam construction from the downstream side
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32. Hoover Dam construction from the downstream side
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33. Concrete bucket on flat car
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34. High level concrete plant
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35. Hoover Dam construction, looking upstream
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36. Hoover Dam construction, looking upstream
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37. Hoover Dam construction, looking upstream
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38. Hoover Dam construction, looking upstream
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39. Hoover Dam construction, looking upstream
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40. Hoover Dam construction, looking upstream
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41. Hoover Dam construction, looking upstream
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42. Hoover Dam construction, looking upstream
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43. Start of construction of an intake tower
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44. Hoover Dam under construction
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45. Power house on Nevada side of Hoover Dam
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46. Dragline loading gravel
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47. Dragline loading gravel into side-dump car
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48. Trash rack structure being installed in front of diversion tunnel no. 2
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49. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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50. Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the...
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