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151. Construction on the no. 4 penstock raise
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152. Construction on the four intake towers in Hoover Dam
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153. Close-up of formwork in the Arizona power house
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154. Construction on the Arizona power house
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155. Looking downstream on the Hoover Dam construction site
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156. View of Arizona spillway during construction
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157. Final pour in the slot, Hoover Dam
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158. Switchyard control circuit tunnel under construction -- Hoover Dam site
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159. Construction of the Arizona power house
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160. Diversion tunnel no. 2, showing the pumpcrete line to the upstream plug
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161. View of construction on roads around the Arizona spillway
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162. Interior of the Nevada valve house
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163. Construction on the Arizona power house
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164. Diversion tunnel no. 1 trashrack and counterweight assembly just prior to the diverting of the...
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165. Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion...
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166. Interior of the Nevada valve house
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167. Construction on the power houses viewed from the valve house catwalk
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168. Panorama view, showing Six Companies Inc. work on the Arizona side of Black Canyon Highway.
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169. Construction on the roadway on top of Hoover Dam
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170. Looking upstream toward the Nevada intake towers, showing the intake bridge girders in place.
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171. Construction on the Arizona power house
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172. Crews and equipment in Black Canyon at dam site
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173. Construction crews in Boulder Canyon
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174. Hoover Dam -- valve outlets in operation on the Arizona side
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175. Hoover Dam -- valve outlets in operation on the Arizona side
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176. Hoover Dam -- valve outlets in operation on the Nevada side
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177. Hoover Dam -- intake towers
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178. Power shovel and trucks opening up an adit
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179. First 40 foot slab of concrete poured in lining diversion tunnels
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180. Day shift workers boarding transports for the return journey to Boulder City
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181. Train car dumping gravel into hopper at gravel plant
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182. Close-up of sand classifier in the gravel plant.
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183. Looking upstream at the upper end of no. 1 plug, showing forms for the intake...
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184. Looking upstream into no. 1 plug, showing the placing of the high pressure valves and...
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185. Agitators dumping concrete into buckets
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186. Telephoto view of Arizona powerhouse units
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187. High scaling operations
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188. Hoover Dam Construction -- blasting
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189. Hoover Dam -- Cement work
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190. Construction of Hoover Dam diversion tunnel
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191. Portals, Hoover Dam construction
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192. Colorado River -- Beginning construction -- Hoover Dam
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193. Construction of Hoover Dam
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194. Penstock pipes at Babcock & Wilcox Plant
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195. Upper portals -- Hoover Dam site
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196. Hoover Dam construction
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197. Construction of gravel plant near Hoover Dam site
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198. Construction worker operating a tractor during construction of Hoover Dam
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199. Colorado River in early stages of Hoover Dam construction
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200. Construction at lower portal of Hoover Dam
 

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