Photograph taken from a high angle looking downward at floor construction for the Oak Grove powerhouse. Wood, pipes, and metal framework can be seen in the floor, while workers can be seen throughout the image. A man is standing on a section of floor with a wooden circle, next to a tripod total station (Image note: deterioration can be seen on the negative along the bottom edge).

Photograph taken from a high angle looking downward at the Oak Grove powerhouse site, showing the first cement being placed. Several men are gathered around the bottom section of a wooden chute extending towards a floor with metal framework. The Oak Grove Fork of the Clackamas River is visible in the background. (Image note: deterioration can be seen on the bottom left corner of the negative).

Photograph taken from dirt road looking downhill towards a temporary camp made up of canvas tents and wooden buildings. There is snow in the ground throughout the image, and in the background is a steep hillside with trees. Written on the negative is “E301.09-O-60.”

Photograph showing pipes with concrete cradles at Frog Lake, in a newly logged area. A railroad track and small wooden bridge can be seen in the background.

Photograph showing men standing next to a round wooden structure during construction at the Oak Grove powerhouse. Two of the men lean on the structure while looking towards the camera. Wooden and metal framing can be seen throughout the image.

Photograph looking upstream and downward at the Oak Grove powerhouse during construction. Wood and metal framework, and men working, can be seen throughout the site, with piles of dirt and lumber in the background. On the left side of the image is a metal bucket attached to a hook and pulley. In the background is the Oak Grove Fork of the Clackamas River.

Photograph, likely taken from Oak Grove Butte, showing Mt. Hood and ridges in the distance. Written on the negative is “E301.09-O-82” and “01.”

Photograph, likely taken from Oak Grove Butte looking southeast, showing mountains and ridges in the distance. Visible is North Pinhead Butte, South Pinhead Butte, and West Pinhead Butte. Written on the negative is “E301.09-O-88” and “8.”

Photograph looking across the South Fork of the Clackamas River, towards camp #2 on the opposite shore. A row of tent cabins, and several small wooden buildings can be seen. In the background is a forested hillside.

Photograph taken from a side angle, showing a man welding at the construction site of the Oak Grove powerhouse. He is facing towards a metal structure, and is wearing a hat, welding goggles, and gloves. In the background, several other men look towards the camera.

Photograph taken from a high angle and looking downwards at construction of the Oak Grove powerhouse, with the Clackamas River visible at the left of the frame. Metal and wood framework can be seen throughout the image, with numerous workers and lumber piles also visible. A railroad track and dirt road cut through the hillside and extend into the distance.

Photograph showing three men on a steep hillside above the Clackamas River(?). One man sits towards the front of the group, while the other two behind are standing and looking towards the camera. At the base of the cliff is flowing water and logs. Written on the negative is “Lower Damsite at Intake, 5-4-20.”

Photograph showing six men working next to a large metal column at the Oak Grove powerhouse. Around the group are piles of cut lumber, tools, and metal and wood building framework. A recently logged hillside can be seen in the background. (Image note: some discoloration can be seen along the left side of the negative).

Photograph showing metal and cement building framework, taken from across the Oak Grove Fork of the Clackamas River. Behind the structure is a dirt hill, with a wooden bridge and dirt road visible near the top of the frame.

Photograph showing an incomplete electrical bay at the Oak Grove dam, with several man visible throughout the frame. Electrical conduits can be seen on the floor, with wood and steel on the supporting walls. A dirt hillside can be seen in the background behind the far wall.

Photograph taken from a side angle showing a pipe traveler on a 68% grade, on the east slope of Cripple Creek knoll. It is traveling along a section of pipe, and appears to be emitting steam. Several men can be seen standing at ground level next to the pipe.

Photograph showing four tent cabins with chimneys in an open field area. Smoke is visible coming out of the chimneys. In the background is a forested hillside. Written on the negative is “E301.09-O-91.”

Photograph taken from a high angle looking downward at the Oak Grove powerhouse during construction. The Oak Grove Fork of the Clackamas River can be seen next to the building, with the Three Lynx camp visible on a hillside in the distance.

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 looking across the Clackamas River (?) at a dam site. Logs and flowing water are visible at the base of the rocky cliff. Written on the negative is “Upper Damsite at Intake, 5-4-20.”

Photograph showing the concrete dam structure at Oak Grove during construction. Around the dam are several wooden structures, including a possible flume. On the left side, a wooden ladder leans again the dam.

Photograph showing a group of men standing with piles of cut wooden boards and logs. One man leans down while the rest of the group looks on. In the foreground is a steam tractor with an attached belt used to run the saw blade. Written on the negative is “E301.09-O-105.”

Photograph showing a camp area with tent cabins and small wood buildings, taken from slightly uphill. Behind the structures is the Clackamas River and a wooded hillside. Written on the negative is “E301.09-O-110.”

Photograph showing five men in boots and work jackets facing forward, with a small railroad car on railroad tracks. Left to right: W.L Sharp, R.C. Mcllwee, H.A. Rands, C.P. Dunn (Image note: some discoloration visible at right side of negative).

Photograph looking across the Clackamas River at camp #3, taken from slightly uphill. Several small wooden structures can be seen above the river bank, next to a large pile of logs. In the background is a wooded hill. Written on the negative is “E301.09-O-108” and “R-2.”

Photograph showing a large generator component being moved with steel cables inside the Oak Grove powerhouse. In the background, a man can be seen looking upwards, while another is visible at the front of the frame looking towards the camera.

Photograph showing two men in hats and coveralls working with a generator component at the Oak Grove powerhouse. One man is facing towards the unit, while another looks towards the camera while facing towards the left. Wooden blocks can be seen under the rotor, which is on the ground.

Photograph showing a quarry of loose dirt and rock, with a man standing next to an electric shovel vehicle. An arm extends from the machine over a pile of dirt and tree branches. In the background, a broken hillside can be seen. Written on the negative is “E301.09-O-112” and “R-1.”