The Army Corps of Engineers driftwood collection vessel Gelberman was on patrol for hazards to navigation on the North River Monday. In the background of the photo below, you can see the historic 1883 Weehawken Water Tower on the top of the Bergen Hill. The Corps’ responsibility for inland navigable waterways dates back even further than that, to a time when rivers and canals were critical to moving troops and maintaining the physical security of the country. Vessels like this are operated by civilian employees.