It's only happened once before that we know of, and it may happen again in a few years.
State officials may temporarily stop the flow of water over the American side of Niagara Falls so they can replace two 115-year old bridges linking the mainland to islands near the brink of the falls.
Buffalo Newsreporter Nancy Fischer says the last time the thundering water flow was halted - in 1969 - thousands of people came from all over the world to take a look.
Click on the LISTEN link above to hear Fischer explain what is being considered, and why.
