It was the first unexpected malfunction.
About two years ago it was necessary to bring down the barriers for routine maintenance. Because there was uncertainty about a backup barrier at that time, it was necessary to do extensive rotenone poisoning and treatment of this particular portion, which is called the Chicago Sanitary and Ship Canal. So yes, there was one malfunction, if you will, but it was for anticipated routine maintenance, and as a result they had to do this extensive poisoning at the time. I believe Canada assisted in dealing with that particular situation.
But this most recent electrical failure was the only unanticipated one I am aware of.