Search for all of "Tunnels", all of "Construction Workers"

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1. Construction near the upper portals of diversion tunnels no. 1 and no. 2
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2. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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3. View of the concrete lining in the diversion tunnels
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4. Side-wall jumbo inside diversion tunnel
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5. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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6. First 40 foot slab of concrete poured in lining diversion tunnels
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7. Hoover Dam construcion -- blasting
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8. Workers in diversion tunnels -- Hoover Dam site
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9. Close-up of trimming jumbo
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10. Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam.
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11. Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...
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12. Crane transporting mixers in diversion tunnel at Hoover Dam site
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13. Trash rack structure being installed in front of diversion tunnel no. 2
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14. Workers and drilling jumbo inside diversion tunnel no. 4
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15. Close-up of workers using a drilling jumbo inside a diversion tunnel
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16. Construction worker in bulldozer in front of diversion tunnel portal
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17. Construction workers using a drilling jumbo inside a diversion tunnel
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18. Invert concrete pouring forms inside diversion tunnel
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19. Gantry crane inside diversion tunnel no. 3
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20. Concrete lining inside diversion tunnel no. 2
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21. Construction of steel forms for the lining of the diversion tunnels
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22. Forms for transition at the downstream plug of Diversion Tunnel No. 2.
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23. Excavation for downstream plug, Diversion Tunnel No. 2.
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24. Excavation for downstream plug, Diversion Tunnel No. 3.
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25. Construction on the no. 4 penstock raise
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26. Construction in the no. 4 penstock raise
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27. Construction in the no. 1 penstock raise
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28. Switchyard control circuit tunnel under construction -- Hoover Dam site
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29. Construction at Hoover Dam, inside a tunnel
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30. Construction of the Arizona power house
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31. Diversion tunnel no. 2, showing the pumpcrete line to the upstream plug
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32. View inside a tunnel at Hoover Dam site
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33. Interior of Hoover Dam diversion tunnel during construction
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34. Diversion tunnel no. 1 trashrack and counterweight assembly just prior to the diverting of the...
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35. Crew working at Hoover Dam site
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36. Digging diversion tunnels at Hoover Dam.
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37. Construction in Black Canyon
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38. Looking upstream at the upper end of no. 1 plug, showing forms for the intake...
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39. Looking upstream into no. 1 plug, showing the placing of the high pressure valves and...
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40. Agitators dumping concrete into buckets
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41. Blasting at Hoover Dam site
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42. Inside a diversion tunnel -- Hoover Dam construction
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43. Construction workers in diversion tunnel, Hoover Dam site
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44. Construction of Hoover Dam diversion tunnel
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45. Construction of Hoover Dam diversion tunnel
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46. Construction workers inside Hoover Dam diversion tunnel
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47. Portals, Hoover Dam construction
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48. Construction of Hoover Dam
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49. Diversion tunnel -- Hoover Dam
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50. Hoover Dam construction
 

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