A boat can be seen emerging from a tunnel that is carved into a sheer rock face. The opening to the tunnel is an archway surrounded by carved stone columns. A stone wall with arches in it can be seen along the side of the rock above the tunnel.

Photograph showing a man kneeling at the top of the tunnel entrance at the Big Sandy Dam (likely the Marmot Dam). He is holding a labeled measuring stick that extends into the water below. (Image note: some discoloration at edges of negative).

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 looking into penstock tunnel at Bull Run. Wooden structure and train tracks visible down length of tunnel.

Photograph showing men working in a rocky underground area. One man stands looking away from the camera, while two others look forward. Water can be seen at the bottom of the frame, and layers of rocks can be seen throughout the top area. Written on the negative is "49-174." (Image note: see likely related images PGE 49-154, PGE 49-161, PGE 49-170, PGE 49-172, PGE 49-175, PGE 49-178, PGE 49-184, PGE 49-185).

Photographs showing six works in tunnel at Oak Grove. One man looks at the camera, while another uses a pick ax to examine a white vein in the rock wall. The four men at the top of the frame stand on temporary scaffolding.

Photograph looking down an underground tunnel. Lights and a large pipe run along the right wall into the distance. A train track is visible on the floor, as well as various pieces of debris against the left wall.

Negative of a photographic postcard showing the interior of a tunnel. The lights in the ceiling of the tunnel are turned on. The road curves inside the tunnel. Handwriting on negative reads, "Tunnel - Willamette Highway - Oregon. Christian S-228."

Negative of a photographic postcard showing the entrance to the Salt Creek Tunnel on Highway 58, also known as the Willamette Highway. Handwriting on negative reads, "Tunnel Willamette Highway, Oregon. Christian 236."

A tunnel looks out at a road under construction, with trees and hills in the background. Men with shovels stand on what appears to be freshly laid gravel. A car and excavator can also be seen in the background (negative 3 of 15).