Black and white image of the view from the Arizona side looking toward Callvilles (out of view, but in the grove of cottonwoods in the distance). It must be remembered that in those days the river was mostly silt, sand and during flood times huge rocks. Government engineers estimated that the Colorado River carried to the Gulf of California 94,000,000 tons of silt and rocks every 24 hours.

Black and white image of Black Canyon, where Hoover Dam now is. Sharp hill showing in the background is Fortification Mountain on Arizona side of the river. Fortification is now about halfway covered by the waters of Lake Mead.

Black and white photograph of Colorado River, Boulder Canyon in early August 1929. Close up of the first core drill rig on Nevada side of the Colorado River where the dam was first planned. Picture was taken from boat on the river.

Black and white image of the Colorado River, Boulder Canyon, summer of 1929. Merle Emory's boat traversing Boulder Canyon.

Black and white image of a mercantile store at Saint Thomas, Nevada in 1929. Town was submerged under water during the construction of Hoover Dam and Lake Mead. Photo sleeve contains additional materials.

Black and white picture of George Kelly Ryan, taken on his birthday, June 3, 1929. Attached to photo: "If memory serves correctly, this picture of me was taken on my birthday, June 3rd, 1929." Photo sleeve contains an enlargement of the original photo.