West by Southwest to Stickney

Chapter 4 Photos, 38–73

(photos 1–37 here)

Extending the Sanitary & Ship Canal

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Photo 4.48

August 14, 1907. The vertical leaf of the Butterfly Dam has been completed and is shown rotated to the closed position for testing. Looking southwest, six smaller gates are used for discharge of water when the vertical leaf is closed to equalize the water level on each side of the leaf. The leaf will not open with a difference in water levels. The through-truss spanning between the upstream and downstream piers holds the upper pivot of the vertical leaf in place. (MWRD photo 3781)