51. Construction on the Arizona spillway and the no. 4 penstock raise in Black Canyon
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52. Aerial view of the Hoover Dam construction site in Black Canyon showing the upstream dam...
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53. Upstream view of the completed Nevada spillway drainage flume and surrounding area in Black Canyon
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54. Looking downstream from the Arizona side of Black Canyon, showing the reservoir level at the...
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55. Crews and equipment in Black Canyon at dam site
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56. Looking up Hoover Dam during construction of the diversion tunnels
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57. Black Canyon during early stages of dam construction
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58. Aerial view of Colorado River-Black Canyon
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59. Construction crew at bottom of Boulder Canyon
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60. Construction crews in Boulder Canyon
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61. Concrete pouring forms on the Hoover Dam construction site seen from downstream
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62. Portion of the gravel pits on the Arizona side of the Colorado River
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63. Construction crews in Boulder Canyon.
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64. One of the construction sites in Boulder Canyon.
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65. Dragline loading gravel into railroad side dump cars
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66. Aerial view of the Colorado River showing diversion of the river into diversion tunnels no....
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67. Boulder Canyon.
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68. Boulder Canyon.
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69. Aerial view of Colorado River in Boulder Canyon.
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70. Aerial view of Boulder Canyon.
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71. Boulder Canyon
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72. Bridge across Boulder Canyon at Hoover Dam site.
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73. Construction on Hoover Dam
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74. Visitors at Lookout Point
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75. Hoover Dam -- downstream face
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76. High scaling operations
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77. Hoover Dam Construction -- blasting
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78. Colorado River before Hoover Dam was built
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79. Construction of Hoover Dam
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80. Hoover Dam construction site, looking upstream
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81. Aerial view of the future site of Hoover Dam
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82. Hoover Dam construction site
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83. Hoover Dam construction
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84. Construction of Hoover Dam
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85. Hoover Dam site, looking downstream
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86. First concrete in Hoover Dam
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87. Hoover Dam, looking upstream
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88. Hoover Dam, looking downstream
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89. Hoover Dam construction, looking upstream
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90. Penstock tunnel, Hoover Dam
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91. Low mix concrete plant
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92. Hoover Dam construction, looking upstream
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93. Hoover Dam construction, looking upstream
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94. Hoover Dam construction, looking upstream
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95. Hoover Dam construction, looking upstream
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96. Hoover Dam construction, looking upstream
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97. Hoover Dam construction, looking upstream
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98. Hoover Dam construction, looking upstream
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99. Hoover Dam construction, looking upstream
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100. Power house construction
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