Colorado River Austin, TX
The Colorado River is an approximately 862-mile (1,387 km) long river in the U.S. state of Texas. It is the 18th longest river in the United State and the longest river with both its source and its mouth within Texas.
Its drainage basin and some of its usually dry tributaries extend into New Mexico. It flows generally southeast from Dawson County through Ballinger, Marble Falls, Austin, Bastrop, Smithville, La Grange, Columbus, Wharton, and Bay City before emptying into the Gulf of Mexico at Matagorda Bay.