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Part of the Great Western Railway, the viaduct is 120 feet high with twelve 60 feet (wide arches, and a further small arch in the Calstock abutment. Three of the piers stand in the River Tamar, which is tidal at this point and has a minimum clearance at high tide of 110 feet.
It was built between 1904 and 1907 by John Lang of Liskeard using 11,148 concrete blocks. These were cast in a temporary yard on the Devon bank opposite the village. The engineers were Richard Church and W. R. Galbraith.