West by Southwest to Stickney

Chapter 4 Photos, 38–73

(photos 1–37 here)

Extending the Sanitary & Ship Canal

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Photo 4.52

May 13, 1925. The Butterfly Dam has recently undergone a thorough rehabilitation and testing in anticipation of the construction of the new state lock adjacent to the District lock downstream. The vertical leaf was operated weekly for testing since its completion in 1907, but an emergency never occurred requiring its use. Looking southeast, gouges can be observed on the side of the upstream pier, a result of being frequently bumped or scraped by passing barges. (MWRD photo 11758)