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. Diversion tunnels during Hoover Dam construction
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5. Diversion tunnels under construction - Hoover Dam
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6. Diversion tunnel at Hoover Dam
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7. Looking up Black Canyon during construction of the diversion tunnels
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8. Looking up Black Canyon during the construction of the diversion tunnels
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9. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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10. Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel
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11. Sidewall concreting in diversion tunnel no. 4 showing workers
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12. Penstock tunnel, Hoover Dam
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13. Power house on Nevada side of Hoover Dam
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14. Lower portals of Diversion Tunnels No. 3 and No. 4, during the flood.
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15. Water flowing into Colorado River, June 16, 1933
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16. Trash rack at the upper portals of diversion tunnnel no. 2.
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17. Hoover Dam construcion -- blasting
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18. Workers in diversion tunnels -- Hoover Dam site
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19. Close-up of trimming jumbo
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20. Construction of Hoover Dam
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21. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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22. Construction of Hoover Dam
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23. Construction of Hoover Dam
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24. Crane transporting mixers in diversion tunnel at Hoover Dam site
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25. Sidewall concreting inside diversion tunnel no. 4
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26. Looking across the river at the lower portal of Diversion Tunnel No. 3.
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27. Gas-air shovel caught in the flooded Colorado River
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28. Trash rack structure being installed in front of diversion tunnel no. 2
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29. Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the...
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30. Workers and drilling jumbo inside diversion tunnel no. 4
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31. Close-up of workers using a drilling jumbo inside a diversion tunnel
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32. Construction worker in bulldozer in front of diversion tunnel portal
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33. Construction workers using a drilling jumbo inside a diversion tunnel
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34. Interior of spillway tunnel, Hoover Dam site
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35. Interior of diversion tunnel during Hoover Dam construction
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36. Forms for transition at the downstream plug of Diversion Tunnel No. 2.
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37. Aerial view of Hoover Dam construction site looking upstream on the Colorado River
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38. View of railroad tracks being laid at Hoover Dam site.
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39. Construction on the Nevada power house
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40. Construction on the no. 4 penstock raise
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41. Construction in the no. 4 penstock raise
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42. Construction inside the upper no. 3 plug
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43. Construction at Hoover Dam, inside a tunnel
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44. Construction of the Arizona power house
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45. Upper portal trashrack for diversion tunnel no. 1, on the Nevada side.
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46. Diversion tunnel no. 2, showing the pumpcrete line to the upstream plug
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47. Looking downstream into no. 4 raise, showing close-up of portal forms.
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48. Number 3 plug and raise
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49. View of no. 4 plug, Hoover Dam site
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50. View inside a tunnel at Hoover Dam site
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