The Infiernillo II Bridge merits a special mention because of the complexity of its construction, partly because of the difficult topography, and also because of the solution given to the assembly of three of the five trusses that make up the superstructure in a yard far from the site, which implied the building of a special pier for the fluvial transportation of the three central trusses (a 1.24 mi stretch). They became temporary barges for their storage and final placement.
To this end, a flotation system was designed, taking advantage of the trusses geometry to take them safely to the supports in the water. This system, developed by us, was an important measure to avoid risks in the assembly of the bridge. Its extensive length, that rises and crosses the reservoir, is of 1 712.59 ft, thus becoming the longest bridge in Michoacán.
Technically, the bridge is composed as follows: its foundations lie on 50 pilings with a 35.4 in diameter, 60 pilings with a 23.62 in diameter and 52.49 ft of drilling, cast on site in a 82.02 ft to 157.48 ft-flow depth, to embed hydraulic concrete cylinders with 27.88 ft and 32.8 ft diameters. The substructure is composed of two hollow 32.8 ft by 9.84 ft rectangular section pilings. Five 334.64 ft trusses, weighing 661.38 t each, make up the superstructure.