NO AUDIO In a special one day cleanup and inspection operation, the mighty waters of Niagara Falls are reduced to a trickle. U.S. Army Engineers divert the flow over the Horseshoe Falls while workers remove debris from the base of the falls and inspect erosion. High Angle Shot of Niagara Falls and people standing on the observation deck. Water going over the falls. Low Angle of mists that cover the falls in a fog. MS A park ranger or policeman man checking out the rocks. Low Angle of water pouring over the edge of the falls rock formations. High Angle Shot as technicians and workers are lowered to the ground to remove debris from the bottom of the falls. They also check for the amount of erosion that has taken place throughout the years. LS wide view of the whole falls with water spilling over and a bridge in the background.