How fast does east river flow?

Average speed: about 1 knot (1.15 miles per hour or 1.85 kilometers per hour)

Maximum flood speed: Up to 3 knots (3.45 miles per hour or 5.6 kilometers per hour) near Hell Gate.

The actual speed of the river varies depending on factors such as tidal forces, weather conditions, and the amount of freshwater discharge from upriver.