Analysis of information sources in references of the Wikipedia article "Penns Grove Secondary" in English language version.
Mantua Creek, Mile 78S, ... entrance jetties are marked by lights, and the entrance channel is marked by buoys. ... The ConRail bridge 1.3 miles above the mouth has a 32-foot-wide swing span... The wharves below the first bridge on Mantua Creek have depths of 20 to 14 feet alongside.