Large ships are seen passing through locks which link Lake Erie and Lake Ontario,
"Aided by giant gates the Welland Ship Canal, linking Lake Erie and Lake Ontario, becomes a through way for big ship traffic." L/S of the Welland Ship Canal. A large steam boat approaches the camera. M/S of a lock opening.
M/S of a man in the control room opening the valves to reduce the water level. High angle of a large boat sinking down as the water level lowers. Camera pans to show another boat in the lock. Various shots of ships passing through the locks.