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151. Concrete lining inside diversion tunnel no. 2
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152. Concrete side wall lining in diversion tunnel no. 3
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153. Side-wall jumbo inside diversion tunnel
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154. Construction of steel forms for the lining of the diversion tunnels
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155. Steel form for diversion tunnel lining being hoisted into Black Canyon
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156. Steel form for diversion tunnel lining being hoisted over the Colorado River
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157. Cape Horn on the Colorado River showing cliff buildings
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158. Dam workers return to Boulder City after shift
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159. View of Colorado River
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160. Truck on road to Hoover Dam site
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161. Black Canyon during dam construction
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162. Bucket skips being filled with "muck" from the deep inner gorge of Black Canyon.
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163. Diversion tunnels during Hoover Dam construction
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164. Hoover Dam area and Colorado River
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165. "Crows Nest" overlooking Black Canyon and the Colorado
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166. Construction workers at Hoover Dam
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167. Workers laying railroad track near Boulder Canyon
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168. Construction crews in Boulder Canyon.
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169. One of the construction sites in Boulder Canyon.
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170. Blasting at Hoover Dam construction site.
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171. Highway near Hoover Dam
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172. Diversion tunnels under construction - Hoover Dam
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173. Construction scene at Hoover Dam site
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174. Construction site at Hoover Dam
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175. Somewhere near present-day Hoover Dam
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176. Construction work at Hoover Dam site
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177. High scalers preparing anchorages in Black Canyon
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178. Construction workers with electric light reflectors standing by a truck in Black Canyon
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179. Future Hoover Dam reservoir area seen from Black Canyon
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180. Blasting on the Arizona side of the cableway bench excavation
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181. Rock blasting in Black Canyon
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182. Close-up of rock blasting in Black Canyon, taken from the Black Canyon Highway
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183. Rock blasting on the Arizona side of Black Canyon
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184. Detail of a sidewall jumbo inside diversion tunnel no. 3
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185. Detail of side-wall jumbo inside diversion tunnel
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186. Section of a concrete-pouring jumbo standing outside of a diversion tunnel
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187. Dragline loading gravel into railroad side dump cars
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188. Railroad freight cars carrying gravel across a trestle bridge on the Colorado River
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189. Man standing on trestle bridge on the Colorado River pointing at anchoring cables
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190. Locomotives at the gravel plant yard
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191. High scalers on the Nevada side of Black Canyon
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192. High scalers on the Nevada side of Black Canyon above the Colorado River
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193. Close-up of construction workers rigging a cableway over the Colorado River
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194. Construction workers on cableway transport over the Colorado River
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195. Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast.
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196. Dumping materials at temporary pile bridge to complete diversion of the Colorado River.
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197. Closeup of Upper Portals of Diversion Tunnels No. 3 and 4, showing flow in Diversion...
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198. Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and...
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199. Panoramic view of the Upper Cofferdam, looking downstream
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200. Aerial view of the Colorado River showing diversion of the river into diversion tunnels no....
 

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