Photograph showing construction at the Big Sandy Dam (likely the Marmot Dam). Several workers are visible on top of the wooden dam structure next to the Sandy River. Uphill are several small wooden platforms and buildings. Written on the negative is “BS-20.”

Photograph taken from a side angle showing the incomplete powerhouse at the Little Sandy Dam. The building is surrounded by wooden scaffolding, with wood debris littering the ground. Works can be seen throughout the image. Written on the negative is “#23 Oct, 10. 1911.”

Photograph taken from a high angle showing a bridge over the Little Sandy River during snowfall. In the distance, men can be seen spraying water out of a hose towards the river. On the left side of the bank is a wooden structure surrounded by trees. Is the distance, snowy trees can be seen on a hillside. Written on the negative is “0261.”

Photograph showing construction at the Big Sandy Dam (likely the Marmot Dam). Several men can be seen standing on the wooden structure at the center of the frame. In the background, a wooden bridge crosses the river, surrounded by trees. Written on the image is B.S-19.”

Photograph showing construction at the Big Sandy Dam (likely the Marmot Dam). Workers can be seen on the wooden structure, with flowing water at the right side of the image. In the background are several small wooden structures. Written on the image is “B.S. 32.”

Photograph showing the Big Sandy Dam (likely the Marmot Dam) spillway with flowing water, taken looking upriver. A wooden platform can be seen crossing the dam above the water. Written on the negative is “B.S. 47.”

Photograph showing the spillway of the Big Sandy Dam (likely the Marmot Dam) while under construction. Works can be seen standing at the top of the structure, while several wooden buildings can be seen in the background. Written on the image is “B.S. 26.”

Photograph of the Big Sandy Dam site (likely the Marmot Dam), showing a wooden flume with suited individuals standing in the foreground. At the top of the hillside, a wooden building and platform can be seen. Written on the image is #34, B.S dam site, looking down stream, Oct 14, 1911.” (Image note: glass negative broken at lower right corner).

Photograph showing construction at the Big Sandy Dam (likely the Marmot Dam). Multiple men can be seen standing on the wooden structure at the base of a loose hillside, while a wooden building and platform can be seen at the top of the frame. Written on the image is B.S-7.”

Photograph showing a temporary wooden dam at the Big Sandy Dam site (likely the Marmot Dam). Two workers stand on the wooden structure while looking upward at the camera. In the background, sandbags, woodpiles, and work tools can be seen. Written on the negative is “#33, Spillway in tempy dam at Big Sandy, Oct 21, ‘11.”

Photograph of river showing tunnel entrance and wooden structures along water edge. Wooded hillsides are seen at both sides of the river. Two men stand at the tunnel entrance.

Photograph showing a wooden bridge at the Big Sandy Dam (likely the Marmot Dam). Water is flowing under the bridge, and in the distance several wooden structures and utility poles are visible. Written on the negative is “B.S.4.” (Image note: some discoloration visible at left side of image).