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1. No. 1 and no. 2 tunnels
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2. Construction of diversion tunnels -- Hoover Dam site
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3. Partially washed-out truck bridge across from diversion tunnels
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4. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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5. Diversion tunnels during Hoover Dam construction
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6. Diversion tunnels under construction - Hoover Dam
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7. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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8. Aerial view of the Colorado River showing diversion of the river into diversion tunnels no....
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9. Diversion tunnel at Hoover Dam
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10. View of the concrete lining in the diversion tunnels
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11. Looking up Hoover Dam during construction of the diversion tunnels
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12. Looking up Black Canyon during construction of the diversion tunnels
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13. Hoover Dam -- diversion tunnels in use
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14. Hoover Dam -- diversion tunnels in use
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15. Looking up Black Canyon during the construction of the diversion tunnels
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16. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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17. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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18. Sidewall concreting in diversion tunnel no. 4 showing workers
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19. Penstock tunnel, Hoover Dam
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20. Power house on Nevada side of Hoover Dam
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21. Lower portals of Diversion Tunnels No. 3 and No. 4, during the flood.
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22. Side-wall jumbo inside diversion tunnel
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23. Detail of side-wall jumbo inside diversion tunnel
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24. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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25. Closeup of Upper Portals of Diversion Tunnels No. 3 and 4, showing flow in Diversion...
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26. Water flowing into Colorado River, June 16, 1933
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27. Trash rack at the upper portals of diversion tunnnel no. 2.
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28. Looking upstream toward the upper plug and raise, in diversion tunnel no. 3.
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29. First 40 foot slab of concrete poured in lining diversion tunnels
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30. Hoover Dam construcion -- blasting
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31. Workers in diversion tunnels -- Hoover Dam site
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32. Aerial view of Hoover Dam
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33. Aerial view of Hoover Dam
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34. Aerial view of Hoover Dam
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35. Close-up of trimming jumbo
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36. Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam.
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37. Aerial view of Hoover Dam and surrounding area
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38. Aerial view of Hoover Dam
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39. Construction of Hoover Dam
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40. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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41. Construction of Hoover Dam
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42. Construction of Hoover Dam
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43. Crane transporting mixers in diversion tunnel at Hoover Dam site
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44. Sidewall concreting inside diversion tunnel no. 4
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45. Water from the Colorado River
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46. Looking across the river at the lower portal of Diversion Tunnel No. 3.
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47. Gas-air shovel caught in the flooded Colorado River
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48. Trash rack structure being installed in front of diversion tunnel no. 2
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49. Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the...
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50. Workers and drilling jumbo inside diversion tunnel no. 4
 

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