Structure
The bridge consists of three wrought iron spans of 305 feet (93 m), each on two sandstone abutments with foundations at a depth of about 45 feet (14 m) below water level. The erection of the lattice girder spans was unusual, because instead of floating them down the river and lifting into position, each was built up piece by piece in situ. The bridge carries a double line of tracks. As the structure superseded a centuries-old ferry, a footbridge alongside the main girders was provided on its eastern side. There is a clearance of 75 feet (23 m) above the high water mark that allowed sailing ships to pass beneath it. There are 6 lattice girders, two to each span. Each girder contains 700 tons of iron and is fastened by 48,115 rivets. From the north side of the river the bridge is approached by a viaduct of 49 arches, then a short piece of embankment, followed by 16 more arches. From the south it is approached by a viaduct of 33 arches. On its completion, the bridge was the longest of its time.
Read more about this topic: Runcorn Railway Bridge
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