Someone flooded the bathrooms.
Of course, the local Canada Geese took full advantage of the expanded waters.
For the sake of comparison, the view from the top of the hill should look something like this (in summer). The benches in the top photo are these ones.
Some towns fared far worse; in Bound Brook, where the river crested at 31.45 feet, the police had to patrol the streets on jetskis and rubber dinghys to evacuate residents. In Highland Park, the water only reached about 15 feet, which is not sufficient to flood the town. Even so, this was the highest I have seen the river in a long time. Newspaper accounts compared it to the aftermath of Hurricane Floyd.