The River That Flows Both Ways

This is a short clip of the Hudson River from Sunday, February 2, 2014.  The ice movement makes it easy to see the Hudson River flowing "backwards."  The Iroquois called it Muh-he-kun-ne-tuk, "the river that flows both ways."  This is taken from the spot where Benedict Arnold jumped in an Army barge and defected to the British (September 25, 1780).  I wonder what direction the river was flowing at that moment?

http://youtu.be/tSmsnczxGU4