Speakers seated on the stage at the Portland State College auditorium during a hearing on the construction of the Hells Canyon Dam (negative 7 of 7).

Negative of a photographic postcard showing the construction of the Detroit Dam in Detroit, Oregon. Taken from a nearby hillside, the view looks down on a dam that is halfway built across a river. A construction crew works on the dam. Handwriting on negative reads, "Detroit Dam Construction - Detroit, Ore. Christian S-129."

A man surveys a dirt area in front of large spillway bays at the McNary Dam on the Columbia River, during its construction. Water can be seen at the base of the cement pillars, with the Columbia River visible in the distance. Photographs from this series were published in the Oregon Journal on Sunday, April 30, 1950 (negative 1 of 42).

An overhead view of construction at the McNary Dam on the Columbia River. The structure is built of wood, rebar, and cement, with the water visible in the distance. Photographs from this series were published in the Oregon Journal on Sunday, April 30, 1950 (negative 23 of 42).

A ferry on the Columbia River, carrying workers during the construction of the McNary Dam. Automobiles and people can be seen on the ferry, which appears to be docked on the river. Next to the ferry is another ship, the Betty Lou Russell. The far shore of the river can be seen in the distance. Photographs from this series were published in the Oregon Journal on Sunday, April 30, 1950 (negative 31 of 42).

Construction at the McNary Dam on the Columbia River. Water can be seen at the base of the spillway bays, with the dam structure in various stages of construction with wood and cement. Photographs from this series were published in the Oregon Journal on Sunday, April 30, 1950 (negative 5 of 42).

Photograph of a construction at the Cazadero Dam during construction. Wooden structure is visible with water from the Clackamas River flowing through the bottom, towards the camera.

Photograph showing in-progress re-decking of the spillway at the Cazadero Dam/Station G. Men are visible at the top and bottom of the structure, and water and wood debris can be seen below the spillway.

Photograph showing completed re-decking on the spillway at Cazadero Dam/Station G. Wood debris can be seen in the water below the spillway, and leftover ropes, ladders and tools are visible on the lower walkway.

Photograph showing construction of Cazadero Dam. Several workers can be seen in the distance at the top of a stacked wooden dam structure, with a dirt hillside above. The Clackamas River is visible at the bottom of the dam, and trees (possibly burnt) can be seen at the top of the hill.

Photograph showing the Cazadero Dam flume running into the distance. Trees (possible burned) can be seen on both sides of the (excavated?) canal.

Photograph looking upstream, below proposed upper dam site at Cazadero Dam/Station G. A railroad track and flume can be seen running into the distance around a hillside, and two possible construction vehicles are visible. The river can be seen on the left side of the frame.

Photograph showing men working underneath a dam structure using a hose and pump. Layers of rock and silt can be seen in front of the men, with a large piece of basalt at the bottom of the frame. Written on the negative is "49-184." (Image note: see likely related images PGE 49-154, PGE 49-161, PGE 49-170, PGE 49-172, PGE 49-174, PGE 49-175, PGE 49-178, PGE 49-185).

Photograph showing the camp at the River Mill Dam site, taken from the top of the railroad bridge. Snow blankets the ground throughout the image, and numerous wooden buildings an be seen. Written on the negative is “82M.”

Photograph showing an excavated area with dirt, water, and gravel. In the distance, buildings, trees, and hillsides can be seen. Also visible in the distance is Mt. Hood. Written on the negative is “0256.”

Photograph of Bull Run reservoir showing dike and temporary falsework for construction of intake. A man in a long coat and hat stands on the dike looking forward. In the background, trees and buildings are visible.

Photograph taken from a high angle showing the penstocks at the Little Sandy Dam. In the distance, numerous utility poles and electric lines are visible. Construction debris litters the ground throughout the image. Written on the negative is “0346.”

Photograph of Bull Run powerhouse surrounded by scaffolding.

Photograph showing the exterior to power plant buildings at the Little Sandy Dam, seen in a wooded setting. Two large buildings can be seen on a hillside, each with large windows. The building near the left side of the frame also includes transformer infrastructure on its roof. Written on the negative is “0356.”

Photograph of a rooming house building in the Little Sandy Dam area, with several people seated on a large porch while looking towards the camera. The building is two stories, with decorative points visible on the roof. Foliage and trees can be seen throughout the image. Written on the negative is “0-335.”

Photograph showing several temporary tent structures in a large field. Is the distance, another structure can be seen, in addition to trees and hills. (Image note: discoloration of the negative is visible at the center of the frame, in addition to a small damaged area also near the center).

Photograph showing a construction site Bull Run. Two men face away from the camera while standing next to piles of cut wood. A small building and wooden tower with ladder can be seen in the background.

Photograph showing construction at the Big Sandy Dam (likely the Marmot Dam). Workers can be seen on the wooden structure, with flowing water at the right side of the image. In the background are several small wooden structures. Written on the image is “B.S. 32.”

Photograph showing the Big Sandy Dam (likely the Marmot Dam) spillway with flowing water, taken looking upriver. A wooden platform can be seen crossing the dam above the water. Written on the negative is “B.S. 47.”

Photograph showing an excavated dirt canal, with visible water at the bottom level. In the distance, works can be seen along the sides of the canal, and a tunnel entrance is visible in the background. Written on the negative is “B.S-22.”

Photograph showing two men with a horse towing a metal cart on a railroad track. The horse is attached to the cart via a harness, with the reins being held by one of the individuals. In the background are trees and a hillside.

Photograph showing construction of the tunnel at the Big Sandy Dam (likely the Marmot Dam). A man stands next to a machine next to the tunnel entrance, which is emitting a large plume of steam. Wood and gravel is visible throughout the image. Written on the negative is “B.S. 48.”

Photograph showing a wooden flume bridge crossing the Little Sandy River near the Little Sandy Dam. Five men in work wear stand on pieces of wood next to the flume while looking at the camera. Water can be seen under the bridge in the background. Written on the negative is “E301-03396.”