It was necessity to built Merchants Bridge in Manchester in order to facilitate business betwixt the older Catalan and new Slate Wharf in the southern region. The bridge was design by the best engineers in order to offer the best canal in the twentieth century. The eighty five tone structure was met with a sickle arch result, whereby deck and support arch curve in differing directions, each harmonizing and responding the other. As a result, it grants great resistance to the plane of the archway by horizontal firmness of the deck, whereas the arms on other hand acting as ties. The deck was 2m wide at its ends and 3m at the central due to it wideness. A 3.5 depth betwixt the water and the soffit at the cut lines permitted, with 4.1m over the five meter long central section. Moreover, the structure had to be built in a way that, it allows boats to pass through.
In addition, jigs had to be built for the aim of obtaining a higher degree of accuracy in welding and cutting, and the segments were experiment erected at Watson’s Bolton tucks proceeding to transmit to location in assemblages each consisting four deck pieces, thirteen hanger arms and three arch pieces (Denson, 2000). The finishing welding and bolting were accomplished on the bank of the canal and the viaduct was hauled up into position by use of a crane which had 800 tones. It was necessity for crane capacity because of the situate limitations and ensuing demands on accomplish. Nonetheless, the fifty meter focal viaduct span was raised and swung, in forty minutes, onto its predetermined bearing on the northeast bank, geared up for positioning on the two descending on the southwest bank. All in all, the completed viaduct was handed over in June 1995. The bridge had a local environmental influence, whereby it provides a better stage for the city consumption.