The Colorado River is a river that runs through the U.S.

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 state of Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

; it should not be confused with the much longer Colorado River

Colorado River

The Colorado River , is a river in the Southwestern United States and northwestern Mexico, approximately long, draining a part of the arid regions on the western slope of the Rocky Mountains. The watershed of the Colorado River covers in parts of seven U.S. states and two Mexican states...

 which flows from Colorado

Colorado

Colorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...

 into the Gulf of California

Gulf of California

The Gulf of California is a body of water that separates the Baja California Peninsula from the Mexican mainland...

.

The Colorado River is the 18th longest river in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 and the longest river with both its source

Source (river or stream)

The source or headwaters of a river or stream is the place from which the water in the river or stream originates.-Definition:There is no universally agreed upon definition for determining a stream's source...

 and mouth

River delta

A delta is a landform that is formed at the mouth of a river where that river flows into an ocean, sea, estuary, lake, reservoir, flat arid area, or another river. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river...

 within Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

; its drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 and some of its usually dry tributaries

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 extend into New Mexico

New Mexico

New Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...

. The 862 miles (1,387.3 km) long river flows generally southeast from Dawson County through Marble Falls, Austin

Austin, Texas

Austin is the capital city of the U.S. state of :Texas and the seat of Travis County. Located in Central Texas on the eastern edge of the American Southwest, it is the fourth-largest city in Texas and the 14th most populous city in the United States. It was the third-fastest-growing large city in...

, Bastrop

Bastrop, Texas

-Demographics:As of the census of 2000, there are 5340 people in Bastrop, organized into 2034 households and 1336 families. The population density is 734.8 people per square mile . There are 2,239 housing units at an average density of 308.1 per square mile...

, Smithville

Smithville, Texas

Smithville is a city in Bastrop County, Texas, United States, near the Colorado River. The population was 3,901 at the 2000 census. The population grew to an estimated 4,339 for 2004.-History:...

, La Grange

La Grange, Texas

La Grange is a city in Fayette County, Texas, near the Colorado River. The population was 4,478 at the 2000 census. The 2006 estimated population was 4,645. But a 2010 census estimated that the city had a population of 4,923...

, Columbus

Columbus, Texas

Columbus is a city in Colorado County, Texas, United States, west of Houston along Interstate 10, on the Colorado River. In 1890, 2,199 people lived in Columbus, Texas; in 1900, there were 1,824 residents. The population was 3,916 as of the 2000 census. It is the county seat of Colorado County...

, Wharton

Wharton, Texas

Wharton is a city in Wharton County, Texas, United States. The population was 9,237 at the 2000 census. It is the county seat of Wharton County and is located on the Colorado River of Texas just south of U.S...

, and Bay City

Bay City, Texas

Bay City is a city in Matagorda County, Texas, United States. The population was 18,667 at the 2000 census. It is the county seat of Matagorda County. The current mayor is Mark Bricker.-Geography:Bay City is located at...

 before emptying into the Gulf of Mexico

Gulf of Mexico

The Gulf of Mexico is a partially landlocked ocean basin largely surrounded by the North American continent and the island of Cuba. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. In...

 at Matagorda Bay

Matagorda Bay

Matagorda Bay is a large estuary bay on the Texas coast, lying in Calhoun and Matagorda counties and located approximately northeast of Corpus Christi, southeast of San Antonio, southwest of Houston, and southeast of Austin. It is separated from the Gulf of Mexico by Matagorda Peninsula and...

.
The Colorado River originates south of Lubbock

Lubbock, Texas

Lubbock is a city in and the county seat of Lubbock County, Texas, United States. The city is located in the northwestern part of the state, a region known historically as the Llano Estacado, and the home of Texas Tech University and Lubbock Christian University...

, on the Llano Estacado

Llano Estacado

Llano Estacado , commonly known as the Staked Plains, is a region in the Southwestern United States that encompasses parts of eastern New Mexico and northwestern Texas, including the South Plains and parts of the Texas Panhandle...

, near Lamesa

Lamesa, Texas

Lamesa is a city in and the county seat of Dawson County, Texas, United States. The population was 9,952 at the 2000 census. Located south of Lubbock on the Llano Estacado, Lamesa was founded in 1903. Most of the economy is based on cattle ranching and cotton farming. The Preston E...

.