Baluarte Bridge saddles in the pylons to form 152 suspenders in a two plane semi-fan layout. The tallest intermediate pier, P9, is high. It crosses a gorge in the Sierra Madre Occidental mountains with a clearance of below the deck, substantially taller than the Eiffel Tower. Its clearance is higher than that of the previous record-holder, France's Millau Viaduct, which has a clearance of . The bridge's central span, long, is also the longest cable-stayed span in North America, longer than that of the John James Audubon Bridge in St. Francisville, Louisiana. Construction on the bridge began on 21 February 2008. The
Erskine Bridge of the bridge. It is the only bridge in Scotland with single cables over central main supports and was in this respect a precursor of the Millau Viaduct in France. At the time of building it was the longest bridge of its type in the world. The bridge cost including approaches was £10.5million. HRH Princess Anne opened the bridge on 2 July 1971. The ceremonial plaque of the opening can be seen on the railings of the western footpath, at the centre of the main span. Whilst the bridge was being constructed, the West Gate Bridge in Australia also designed