The day Niagara Falls dried

http://www.cosmosmagazine.com/blog/5461/the-day-niagara-falls-dried

While today marks the anniversary of the only natural stoppage of the Niagara Falls flow, in July 1969, a team from the U.S. Army Corp of Engineers managed to divert the flow of water from Niagara River away from the American half of the Niagara Falls for several months with an artificial dam. This colossal effort allowed them to study the composition of the riverbed and strengthen a number of faults so slow the inevitable erosion of American Falls. Unfortunately for those of us who love when horses parade, unlike in the 1848 dry-up, no horses were paraded across Niagara Falls in 1969.