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

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 showing men in work wear standing next to a large Y shape penstock. The metal penstock is seated on long pieces of wood with visible writing on different sections. A railroad track can be seen crossing through the front of the frame.

Photograph showing men in work wear standing on top of a wooden structure with rounded forms. Written on the negative is “intake 2-5-12.”

Photograph showing men working on a large wood frame structure. Pieces of wood and tools can be seen throughout the image, and a ladder can be seen in the bottom right corner. Written on the negative is “Intake, Bull Run, 2-26-12 (67).”

Photograph looking into wooden penstock at Bull Run.

Photograph showing small wooden building with piles of cut lumber in front of a steep logged hillside. On the right side of the frame, the Clackamas River, or Oak Grove Fork can be seen, and snow is on the ground throughout the image. Written on the negative is “E301.09-O-369.”

Photograph showing the Oak Grove powerhouse during construction. The Oak Grove Fork of the Clackamas River can be seen running alongside the building area, while a large pipe and possible flume extend uphill from the structure. A wooden trestle is also visible on the hillside above the building.

Photograph of Oak Grove project showing second unit penstock, looking uphill. Two men are visible.

Photograph from Oak Grove project showing construction of unit plant and penstock. A brick building can be seen at the base of a dirt hill, with a small round building visible at the top. The Clackamas River runs along side the building and supporting wall.