pins moved . The water-cylinder jacks were also high, capable of exerting after pumping. By bleeding water out of the cylinders of the jacks all at once, workers used the four jacks on each side of the bridge to lower the spans on alternate sides to the full depth of . Transport Workers made a pontoon out of two pairs of barges, spaced to create a platform long and wide, which carried the bridge with of overhang. Stringers supported the bridge in forty-two places, with a 40-ton screw jack at each stringer for easier loading and unloading. When workers reached the Manchester Bridge, they had to adjust the bridge to fit the clearance, which was and less than the bridge's height. After supporting the bridge under the floor beams, they disassembled the top chord and stabilized each panel point on the trusses. Steering the bridge under the Manchester Bridge and the railroad bridge at Brunot's Island, the tugboat captains went through the Ohio River lock and up the back channel toward Coraopolis, where piers and abutments had been constructed. Reassembly Reversing the process and using the same jacks and steel frames to raise the structure , the company erected the Cooper bridge 30 days after the project began. The Farris Engineering Company, a Pittsburgh company located in the Empire Building, performed a great deal of work on the bridge at its new location. The original approved contract for their work had a price total of $271,811.50. They built portions of the substructure that the Foundation Company had not done. Farris also erected the two pony truss approach spans, repaired and painted the main superstructure, and paved the bridge deck and the two approaches. The approach spans, and the end bearings for the main spans, were fabricated by the American Bridge Company at its shops located in Ambridge, Pennsylvania. End of life Allegheny County ended up replacing the Coraopolis Bridge with a new bridge at this location. By the 1980s, due to its deteriorated condition and inadequate load carrying capacity, the four span truss bridge did not meet the transportation needs of its location. After nearly 50 years of additional service, which included weight restrictions and closings during cold weather (for a time it was restricted to carrying vehicles with a maximum weight of three tons, and it was only open to vehicular traffic during periods when the temperature is above