Negative of a photographic postcard showing the Mill River Power Plant at the River Mill Dam in Estacada, Oregon. Water from the Clackamas River goes over the spillway. Handwriting on negative reads, "Mill River Power Plant - Estacada, Ore. Christian 11-6010."

Negative of a photographic postcard showing the Mill River Power Plant at the River Mill Dam in Estacada, Oregon. Water from the Clackamas River goes over the spillway in the background. Power lines carry electricity from the plant. Handwriting on negative reads, "Mill River Power Plant - Estacada, Ore. Christian 11-6007."

Photograph showing a spillway structure during the 1964 Christmas flood (taken December of 1964). Water can be seen rapidly spilling down the structure, with a small building visible at the far side of the river. High water levels can be seen upriver, in addition to forested hillsides and trees.

Photograph showing water cascading down Willamette Falls in Oregon City. Industrial buildings can be seen just above the falls, with a rocky cliff and houses visible in the background. Above the waterfall is a spillway. Written one of the of large industrial buildings is "Publishers Paper Co."

Photograph taken from a high angle and looking downward at a large stream of water being released from a pipe attached to a small building. Just below the camera, a man faces towards the side and points at the water. Behind the building is a cutaway hillside with dirt and rocks. Written on the negative is "56-254."

Photograph showing a large stream of water exiting a pipe and flowing towards the camera. In the background are several hills of dirt and rock, as well as a cement bridge. Written on the negative is "56-254."

Photograph taken from a high angle and looking downward at a large stream of water being released from a pipe attached to a small building. Two automobiles can be seen next to the building, one with "PGE" painted on the drivers side door. Behind the building is a cutaway hillside with dirt and rocks. Written on the negative is "56-254."

Photograph taken from a high angle and looking downward at a large stream of water being released from a pipe attached to a small building. A man can be seen standing to the right of the building, and two automobiles are parked in front. Water flows away from the building into the trees. Uphill is a dirt road and embankments. Written on the negative is "56-254."

Photograph showing Timothy Lake early in the water release process. Lower parts of the lake are covered in water, with new dirt and cut stumps visible at higher levels. A low forested mountain can be seen in the distance. Written on the negative is "56-251."

Photograph showing Timothy Lake early in the water release process. A bridge of cut logs and wood planks extends to the far shore of the lake, with a rowboat moored to a section of the structure. Cut stumps on a hillside can be seen in the distance. Written on the negative is "56-251."

Photograph looking across water towards a cement and metal dam structure at Timothy Lake. Cut tree stumps and dirt can be seen to either side of the structure, as well as an area of rocks. In the distance is a low forested mountain and trees. Written on the negative is "56-251."

Photograph showing Timothy Lake early in the water release process. Lower parts of the lake are covered in water, with new dirt and cut stumps visible at higher levels. A utility pole and three bulldozer machines can be seen above the water along the shoreline. In the distance is a dense forest starting at the edge of the new lake.

Photograph showing a scenic view of Mount Hood from the south side of Timothy Lake looking north. Trees can be seen in front of the camera, with newly excavated dirt in front. In the distance, low water can be seen in the lake, likely during water release.

Photograph showing a cement dam structure at Timothy Lake before water release. A dirt road curves through the frame and crosses the dam structure. A dense forested area can be seen in the background along the edge of the excavated area.

Photograph showing Timothy Lake before water release. A pool of water can be seen at the center of the frame, surrounded by bare dirt. Another pool can be seen towards the bottom of the image, separated by a raised dirt dam. Plumes of smoke can be seen in the distance, as well as a low rounded hill.

Photograph showing a man wearing a long jacket standing on a raised cement platform. He is looking towards three large electrical units with belts, and water can be seen under the platform. In the background is a wooded hillside. Written on the negative is "51-868."

Photograph showing a group of seated people outside a stone building, with a man standing and facing the group next to a stairway. A sign on the building reads "River Mill Hydroelectric Project," and a river and trees can be seen in the background. Written on the negative is "51-864."

Photograph showing a man facing towards a large electrical generator at the Oak Grove Dam. On his right is a stairway leading to the upper level of the generator, which is in a large industrial powerhouse building. Written on the negative is "49-291."

Photograph, looking towards the powerhouse structure at the Oak Grove Dam. Large pipes can be seen behind the building, extending up a large hill towards a tank at the top. To the left of the stone building, a retaining wall and metal frame structure can be seen. Written on the negative is "49-289."

Photograph looking upstream, below proposed upper dam site at Cazadero Dam/Station G. A railroad track and flume can be seen running into the distance around a hillside, and two possible construction vehicles are visible. The river can be seen on the left side of the frame.

Photograph of the Cazadero flume at generating Station G, showing a compressed air concrete mixer on a train car. Two men stand at either side of the mixer while looking at the camera.

Photograph showing the Faraday flume for generating Station G. Below the flume structure, the Clackamas River can be seen, with several small waterfalls flowing off the hillside above.

Photograph showing the Cazadero Dam flume running into the distance. Trees (possible burned) can be seen on both sides of the (excavated?) canal.

Photograph of the Cazadero flume at generating Station G, showing air compressor and pipelines weld, in placing concrete for new bents. Several cars can be seen on a railroad track, and the flume can be seen running along the right side of the frame.

Photograph taken from above Cazadero Dam/Station G, looking downriver towards the spillway and wooden dam structure. Behind, a dirt hillside and trees can be seen.

Photograph taken from a side angle, showing the flume at the Cazadero Dam/Station G. Below the wooden flume is a dirt hillside with rocks, and a long wooden building can be seen in the background on the right side of the frame.

Photograph looking towards flume and railway tracks at Cazadero Dam/ Station G. A man stands on the railway tracks in the distance, and a dirt hillside drops down between the tracks and the flume.

Photograph showing the flume at Cazadero Dam/Station G during a flood. Rapidly moving water is visible in the Clackamas River below the flume, and a wooden building can be seen on a hillside above.