Mohawk Valley 📍

 ... it looks like a DOT highway bridge minus a roadway. The extra chord on downstream side was added in early 1910s when they decided the bridge dams needed further strengthening. Actually, in the case of the Tribes Hill Bridge Dam (Lock 12), it was designed as a Bridge Dam but then the DOT added a roadway to the Bridge Dam 1927. More about the history of bridge dams: americancanalsociety.org/bridge-dams-mohawk-river-barge-canal/