Colorado River

The Colorado River is a river that runs through the U.S. state of Texas. The Colorado River is the 18th longest river in the United States and the longest river with both its source and mouth within Texas; its drainage basin and some of its usually dry tributaries extend into New Mexico. The long river flows generally southeast from Dawson County through Marble Falls, Austin, Bastrop, Smithville, La Grange, Columbus, Wharton, and Bay City before emptying into the Gulf of Mexico at Matagorda Bay.