The Pinto Settling Basin as seen in 1906 on the left and 2011 on the right. The two gates in the foreground were the structures 5F,
the entrance gates to the Pinto Pressure Pipes. It appears that the one on the left is open. The opening in the basin wall in the center
right portion of the photo contained the 5E structures, the double sluice gates that could be used to drain the pond.