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 a short wooden dam structure on an unidentified river (possibly the Columbia River). Several men can be seen on top of the structure, on top of which water is being diverted from a pipe. Rock cliffs, wooded hills, and buildings can be seen in this distance. Written on the negative is "49-178." (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 49-184, PGE 49-185).

Photograph showing a short wooden dam structure on an unidentified river (possibly the Columbia River?). Below the structure is an area of natural rock formations and logs, and wooded hills can be seen above the shore in the distance. Written on the negative is "49-172." (Image note: see related images PGE 49-154, PGE 49-161, 49-170, PGE 49-174, PGE 49-175, PGE 49-178, PGE 49-184, PGE 49-185).

Photograph showing a man in a diving helmet, partially submerged next to another man who is standing on a wooden board. The diving helmet is metal and has several openings. Written on the negative is "49-205. "(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 49-184).