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
Tarn (river) Tarn (river) The Tarn (, , possibly meaning 'rapid' or 'walled in') is a long river in southern France ("régions" Languedoc-Roussillon and Midi-Pyrénées), right tributary of the Garonne. The Tarn runs in a roughly westerly direction, from its source at an elevation of 1,550 m (5,085 ft) on Mont Lozère in the Cévennes mountains (part of the Massif Central), through the deep gorges and canyons of the Gorges du Tarn (that cuts through the Causse du Larzac), to Moissac in Tarn-et-Garonne, where it joins the Garonne downstream from the centre of town. Its basin covers approximately , and it has