Oueen Isabella Memorial Causeway Panorama – Queen Isabella Memorial Causeway Bridge is the only road to South Padre Island from Port Isabel. Many tourist come to Padre Island for the blue waters and the miles of white sandy beaches. The area is also supported by commercial fishing, tourism, and the petroleum industry. In 1978 the Port Isabel Ship Channel was dredged to thirty-six feet in depth and 200 feet in bottom width to allow larger barges and ship. South Padre island is located in south Texas and not far from the Mexico US border. This is in far south Texas but it is visited by many who come for all over for the nice subtropical weather and white sandy beaches every year. This is also a popular spot for spring break but it also has a large RV following especially in the off seasons.