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 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 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 a wooden footbridge over a river (Oak Grove Fork of the Clackamas?). At the bottom of the frame, two men stand on the bridge, one of which is looking at the camera. Water can be seen flowing under the bridge. Written on the negative is “E301.09-O-26” and “25.”

Photograph showing a road cut through a hillside, with trees and mountains in the distance. Below the road, rocks and debris and can seen down the hill. Written on the negative is “E301.09-O-29” and “30.”

Photograph looking across the South Fork of the Clackamas River, where a man in a hat and vest is standing on the opposite shore. Above the man, a road cut can be seen, with dirt and rocks falling downshill. Written on the negative is “E301.09-O-31” and “38.”

Photograph taken from a hillside looking downward at Oak Grove Meadow. A large ditch can be seen extending into the distance near the center of frame. On the left side if a large pipe on a railway car. Trees and mountains can be seen in the distance.

Photograph looking down a large pipe, showing the outline of a person.

Photograph showing men and horses standing on a trail cutting through a rocky slope. They are facing away from the camera and mounted. Written on the negative is “E301.09-O-27” and “43.” Image note: “Sherrard, Cravey, Caldwell” written on negative sleeve).

Photograph showing the South Fork of the Clackamas river, looking towards a large rocky cliff-face. A man can be seen walking on a log in the river, while three others sit on a rock extending into the water. Written on the negative is “E301.09-O-36.”

Photograph showing a group of men excavating a hillside at the Oak Grove powerhouse site. Next to the group are two large metal buckets, which are attached to a hook and pulley.

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 showing a hillside with a man in the foreground, with a steam shovel visible further along a cut dirt road. The man is turned sideways and is bending over a long piece of pipe. On the right side of the frame, the Clackamas River is visible, along with rock and mud debris. Written on the negative is “E301.09-O-54” and “11.”

Photograph showing three men wearing hats on a rocky point at Oak Grove Butte. Mount Hood is visible in the distance on the right side of the frame, along with several other points and ridges. Written on the negative is “E301.09-O-24.” and “46.”

Photograph taken from the front, looking at a pipe traveler moving along a track in a excavated dirt area. Two men ride at the top of the unit, while others can be seen below on the ground. A large metal pipe is being held in the unit, which appears to be attached to a pulley cable system.

Photograph taken from a side angle, showing an incomplete wooden trestle bridge crossing a dirt ravine. A small creek is running downhill and under the bridge, while trees and mountains are visible in the distance. Two men can be seen standing on the left side of the bridge.

Photograph taken from a side angle showing a pipe traveler machine being tested on a short length of pipe, in a recently cleared dirt area. Two individuals can be seen standing on top of the device.

Photograph showing the top surface of a wooden trestle bridge and a dirt road, with a wooden flume and dam structure visible in the distance (Cazadero Dam). In the background, forested hillsides can be seen above the Clackamas River. Written on the negative is “E301.09-O-23” and “32.”

Photograph showing a wooden dam being built across a flowing river (Oak grove Fork of the Clackamas?). Several individuals can be seen throughout the frame, and piles of wood are visible at either side of the dam structure. Across the river is a recently logged area with fallen timber.

Photograph taken from a side angle showing a roofed pipe traveler device, in a dirt ditch and area recently cleared of trees. One man can be seen in the pipe traveler, while another stands at ground level.

Photograph showing a group of people standing next to a small wooden building at Austin Hot Springs. The Clackamas River can be seen next to the building. Written on the negative is “E301.09-O-25” and “45.” (People included: Crane, Caldwell, Sherrard).

Photograph showing a railroad train towing several large pieces of pipe on attached railroad cars. The train is traveling through an open area surrounded by dense forest, and four men can be seen in the frame in between the camera and train.

Photograph showing a camp area next to a river, with several wooden and canvas buildings visible throughout the frame. A small wooden bridge crosses the river, on which two men stand facing the camera. Beyond the grouping of canvas tent cabins, smoke can be seen, likely from brush burning.

Photograph showing a group of people standing on a road while looking towards the camera (including Franklin T. Griffith, President). The road and hillside is covered in rocks, and in the background is a large pile of cut trees.

Photograph showing an excavated dirt area (Frog Lake) with tree stumps, cut timber, and a railroad track. Trees can be seen at the edge of the dirt, with forested mountains in the distance.

Photograph taken from across the Clackamas River showing two small wooden “clockhouse” buildings. Snow can be seen throughout the image, one the ground and trees. Written on the negative is “new and old clockhouses at Big Bottom 12/15/20.” (Image note: see related image PGE 16-35)