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This photograph shows the "spill lock" to the Chemung Canal in Elmira, N.Y. This lock was built to allow boats to lock into or out of the Chemung River. Unfortunately, the river level was usually too low to accommodate the lock so it was rarely used.

The map above shows the Chemung Canal in Elmira at the spill lock, lock 49. Just north of the spill lock was a basin where boats could tie up or turn around. (source: NYS Archives)