Tom Knight's caption on verso: "From the cement dock level, looking into the canon. Showing the power house and the white water from the sluice gates."
Scaffolding visible on the dam face, with men working on it.
The Panama Canal was opened on August 15, 1914. The first major capital improvement was the Madden Dam and Power Project. Completed in 1935, it controlled the flow of water from the Chagres River into Gatun Lake and created its own reservoir,...