The Bridge can be destroyed in game but it will be repaired after loading a save. Its presence is vital for the completion of the "Black Market, Warm Heart" contract for the Pirates (unless the truck is airlifted).
In real life, there is no bridge linking Altagracia with Caracas because they are actually not geographically as close as they are in the game.
Venezuela did build many Viaducts to connect Caracas to La Guaira which were part of the most expensive highways in the world.
- AN Messengers may be seen using this bridge before the Allied Invasion