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 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 of construction workers at a work site. Two trucks labeled, "Ross Island Premix Concrete," are on-site, and one pours concrete. Handwritten note on back indicates this was taken September 23, 1947. Note also indicates the initials "JY", likely Jerry Jiro Yasutome, and that this was taken in one of his PM classes at the Northwest School of Photography.