"Where a canal crosses a river at the same elevation or joins a river at a dam,
there is a need for protection of the canal from flooding of the river.
This is often accomplished with a guard lock to allow movement between
the canal and the river even if the river rises while controlling the flow into the canal.
Often when the river is not in flood, the gates of the guard lock are left open.
Guard locks with two guillotine gates are on both sides of the modern Erie Canal
crossing of the Genesee River."

This gate is on the east side of the Genesee River. It is closed for the winter,
while the canal is drained.

Upload for 24 Jan. 2011 (Drive-by shot from the Interstate)