Black and white image of a celebration at the Hoover Dam powerhouse. The Young Presidents' Organization arranged a party for nearly 1,000 people that was held on the powerhouse roof. The visitors, all wearing hard hats, were the first to use this setting. Tables and chairs are also visible on the powerhouse roof.

Black and white image with the following printed description: "View showing extension work on Nevada Spillway Tunnel #2 at Hoover Dam. Work performed by Guy F. Atkinson Company of San Francisco, California." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Boulder Dam, December 20, 1936. Water is being released from the dam itself into the reservoir below on the Colorado-River-side of the dam. Site Name: Hoover Dam (dam)

A painted photo depicting Lake Mead and Hoover (Boulder) Dam. Text on front of post card: "Lake Mead in Black Canyon, Boulder Dam", "Boulder Canyon Project of the Business of Reclamation"; Text on back of post card: "Lake Mead is quite narrow, just above Boulder Dam, yet more than 500 feet deep, where it is confined between the somber cliffs of Black Canyon gorge. Beyond the gorge the waters spread extensively over the desert valleys to form a vast lake 115 miles in length, with a shoreline of more than 550 miles - the largest man-made lake in the world. Comfortable cruisers make regular scheduled excursions on Lake Mead."

Black and white image of Dick Woodward (left) and Ellis L. Armstrong at a party held by the Young Presidents' Organization on the roof of the powerhouse at Hoover Dam. Nearly 1,000 people attended, all wearing hard hats, and were the first to use this setting.

People walking about a power station located at the Hoover Dam in Boulder City, Nevada.

This photograph has three images. The first one, (0272_0002) reads, "Transports coming from dam-day shift. Climbing out the sides to be one of first in the commissary for a bottle of beer. It's been hot down there and they are thirsty," as a handwritten inscription. The second one, (0272_0003) reads, "One of several dorms that happened to be mine. (The arrow points to room) No grass to mow. One of its good points. Radios would not receive programs until early night, reason- no ground-no moisture in soil," in a handwritten inscription. The Six Companies Inc. dormitory housing 172 men, Boulder City, NV. The third picture, (0272_0004) which is upside down, reads "One pour wide getting in each other's way; hi-line moving catwalk soon will be finished," as a handwritten inscription on the image about the Hoover Dam under construction.