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On the sign:
A celebratory fountain was constructed in Union Square at the completion of the Croton Aqueduct
Part of a series of 22 plaques surrounding Union Square depicting the history of the square from 1600 to 1882 - the year in which the first Labor Day Parade took place at Union Square, and labor movement events that were held in the United States (Union)
The plaques are made of bronze, designed by Gregg LeFevre and set up in 2002
The current plaque shows the fountain erected in Union Square for the completion of works on the Croton Aqueduct. The water carrier built from 1837 to 1842 was one of the first in the United States to carry using the gravity power from the Croton River to the Manhattan water reservoirs. The fountain was erected in 1842 upon completion of the works and began operation on October 14. Although what is written on the sign the fountain is in City Hall Park and not in Union Square (but this may be a fountain that was opened just for the works celebration)