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
Pfrimm Viaduct Pfrimm Viaduct The Pfrimm Viaduct (), colloquially also called the Marnheim Bridge ("Marnheimer Brücke"), was a railway bridge near Marnheim in the county of Donnersbergkreis in the German state of Rhineland-Palatinate. It was built as a stone arch and truss bridge from 1872 to 1874, was 260 metres long and 30 metres high, and carried the Donnersberg Railway from Hungerberg over the valley of the Pfrimm to the Zeller Valley Railway, which is only open at weekends today. The bridge is a protected monument and forms the "Gateway to the Zellertal" ("Tor zum Zellertal"). The viaduct was built east of