The Carroll Street Bridge (NYC BIN #2240260) opened in 1889 and is a very rare
example of a retractile drawbridge in which the main span is slid back
on rails diagonally to clear passage through the canal. It is also notable as a rare
surviving example of a kingpost truss - in this case constructed with plate girders.
The bridge was designed by engineers at the Brooklyn Department of Public Works
and built by the New Jersey Steel and Iron Company (Trenton Iron Works), a subsidiary
of the firm of Cooper, Hewitt and Co. The bridge is trapezoidal in shape with
a 17-foot roadway and 4-foot sidewalks. The span is 63 feet with a total
bridge length of 107 feet. The channel it clears is 38 feet wide.