February 2008 -- about a year ago.
Interesting aside:Here are some facts about Niagara and Horseshoe Falls.
Niagara Falls was turned off for inspection in 1969. I visited there on a vacation while it was turned off. This faucet feat was accomplished by installing an earthen cofferdam upstream of the falls. Horseshoe Falls remained flowing, and I suppose that the upstream diversion structures and tunnels diverted more than the usual amount of river water through the various hydroelectric powerhouses in the area. It was thought that something should or could be done to reduce the rate of erosion of the lip of the American falls to maintain their esthetically-pleasing appearance, and to prevent their eventually turning into a series of rapids. They decided that there was nothing that should be done. That was a good decision, I think: Man probably ought to let nature handle itself rather than spending massive amounts of tax money on them. Now some forty years later, the falls still look fine without our having meddled with them.
Another interesting fact is that there is a now-shut-down hydroelectric plant on the Ontario Canada side whose discharge is in the form of a tunnel that exits behind Horseshoe Falls. A group of urban explorers went there and documented their trip. Exciting, if dangerous and illegal stuff, this. See this and this as well.
...and a long way back up.
The Chicago Region BMW Owners Association has a useful article that many of us can profit from called Flatlander's Ride Guide for Twisties, by Tom Brown."Manage your hydration level. Drink water at every stop. When you're 'in the wind', fluids leave your body quickly. If you get even mildly dehydrated, your mental ability will suffer...and you'll be prone to panic and bad judgment."