On March 15, 2005, SICT granted the Government of the State of Campeche the concession to operate, exploit, conserve and maintain the bridge called "La Unidad-Eugenio Echeverría Castellot" for a period of 20 years, which is no longer in operation.

On July 2, 2013, the State Government requested SICT to grant a concession to operate, exploit, conserve and maintain a new La Unidad Bridge, since the "La Unidad-Eugenio Echeverría Castellot Bridge" is no longer in optimal condition to continue adequately communicating Isla del Carmen with Isla Aguada in the State of Campeche and the investments that will be required for its renovation are just as expensive as the construction of a new bridge with the same functions.

ORIGINAL CONCESSION (03/15/2005). Concession to operate, exploit, conserve and maintain the 3,222 m long with 2 lanes "La Unidad Eugenio Echeverria Castellot" bridge, located at the federal highway number 180, between the 38+200 km and the 41+422 km. The bridge connects the eastern end of Isla del Carmen (Puerto Real) with the mainland part on Isla Aguada in the state of Campeche. The concession includes the right-of-way, works, constructions and other goods and accessories.