Construction of Twelve Mile Ditch at Slate Creek, c1908.

Photograph of penstock during construction on hillside in the Twelve Mile area of the Twelve Mile Ditch system. Penstocks, also known as header boxes, connected a flume to a pipe or it connected wood stave pipe to steel pipe, which was used to siphon water through a valley from one hillside to another. See 1984.234.176, same penstock from a different angle earlier in construction.