DCOP Development Corporation of Presidio DCOP is a 4b Economic Development Corporation. Presidio, Texas welcomes new business on the International Border of Texas and Mexico. The Presidio-Ojnaga Port is open 24/7. It is the only international crossing between El Paso and Del Rio. Travel into Mexico is easy with short crossing times for tourist and commercial traffic. The Big Bend Region is a major tourist destination. The largest State Park in Texas, Big Bend Ranch State Park and Big Bend National Park and Presidio is the western entry to both parks. FM 170 or the River Road has been named one of the Top 10 Scenic Drives in North America by National Geographic Magazine.