Black and white photograph of a dam, possibly the Hetch Hetchy. A road is carved into the mountainside next to the dam.

Black and white photograph of a dam built on the edge of a lake. "Junction Dam. Is written on the bottom of the image. The dam is know known as the "Tippy Dam."

Smoky Mountains (Tennessee, North Carolina). Film includes unidentified locales in the Smoky Mountains, and includes waterwheels in Tennessee and the Cheoah Dam and power plant on the Little Tennessee River in Graham and Swain counties, North…

Oxbow Dam, also known as Hardy Dam, in Newaygo County, Michigan. 16mm film shot by D.J. Angus in 1930s. [0:14]

Croton Dam in Muskegon, Michigan. 16mm film shot by D.J. Angus in 1930s. [0:23]

Roosevelt Dam is on the Salt River, northeast of Phoenix, Arizona. Construction began in 1903 and was completed in 1911. It was officially named after Theodore Roosevelt in 1959, and became a historic landmark in 1963. 16mm film shot by D.J. Angus…

Smoky Mountains (Tennessee, North Carolina). Film includes unidentified locales in the Smoky Mountains, and includes waterwheels in Tennessee and the Cheoah Dam and power plant on the Little Tennessee River in Graham and Swain counties, North…

Oxbow Dam, also known as Hardy Dam, in Newaygo County, Michigan. 16mm film shot by D.J. Angus in 1930s. [0:14]

Croton Dam in Muskegon, Michigan. 16mm film shot by D.J. Angus in 1930s. [0:23]

Roosevelt Dam is on the Salt River, northeast of Phoenix, Arizona. Construction began in 1903 and was completed in 1911. It was officially named after Theodore Roosevelt in 1959, and became a historic landmark in 1963. 16mm film shot by D.J. Angus…

Shoshone Dam near the entrance to Yellowstone Park, Wyoming.

Power house below Shoshone Dam, Wyoming.

Shoshone Dam near the entrance to Yellowstone Park, Wyoming.

Canyon below Shoshone Dam, Wyoming.

Shoshone Dam on Colorado River above Glenwood Springs.

Little Dell dam in Parley's Canyon is a source for Salt Lake City water supply.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Powerhouse for Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Croton Dam in Muskegon, Newaygo County, Michigan.

Powerhouse for Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Powerhouse for Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Dix Dam, completed in 1927, was constructed across the Dix River three miles upstream from its confluence with the Kentucky River. It was the world's largest stone-filled dam.

Dam north of Noblesville, Indiana.