Boulder Dam under construction over the Colorado River in the United States. The Colorado River and work under way in the Black Canyon. Rocks on both sides of the river. Men in a boat bring supplies to the site. The site of work. Men cross the river on a bridge. Rocks of the canyon being blasted for providing foothold for roads and rail lines to the dam site.
Diversion tunnels made for the construction of Boulder Dam on the Colorado River in the United States. The dam site in the Black Canyon of the Colorado River. Rocks on either side of the river. A bridge on the river. A small tunnel on one side of the river. Several workmen at the mouth of the tunnel. Men operate drilling jumbos mounted on a motor truck. A man on a ladder. Workmen drill holes into rocks with drifter drills. Equipment for drilling. Trucks and power shovels in a bore to remove shattered material. A truck comes out of the tunnel. Workmen watch the truck. Trucks move in a line on a road along the canyon walls. The trucks dispose off wastes in gulches. Men at work in the tunnel. A man operates a concrete machine. A gantry crane is operated by workmen to lay lining of concrete on sidewalls of the tunnel. Men near movable steel forms. A man operates a machine.
The construction of the Boulder Dam, later the Hoover dam, in Boulder City, Nevada. Construction of the Boulder Dam underway at the dam site in the Black Canyon of the Colorado River. Equipment at work at the site. A crane transports movable sections and place them on the side walls of the dam. An operator at the controls of the crane. Rocky side walls of the canyon. An officer watches the construction work. The tunnel on the dam through which water flows. Onlookers and officials beside the flowing water as the final gates of the dam are closed in the grand opening of the dam. The construction material at the site. Aerial views of the construction site.
Events after floods in Rapid City of South Dakota. Cleghorn Canyon where the flood began. Homes destroyed in canyon. Wrecked cars outside wrecked homes.
View of waterfall in Yosemite National Park. Tourists look at mountains. Tourists on overhang look down into the canyon. Tourists on horseback travel down a steep path into the canyon.
The Yellowstone National Park in the United States. Sign reads 'The Canyon is about 750 feet deep and 1500 feet wide'. Views of canyon of the Yellowstone river. Waterfall in distance. View of the waterfall. Group of tourists watch grizzly bears eat. Moose feeds the young ones. Sign reads 'Tower Falls,Height 132 feet'. Rock formations at top of the fall. View of a cliff. A herd of buffalo. Steam rises.. Automobile traffic on mountain roads.