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Rio Grande Río Bravo del Norte, Tooh Baʼáadii (in Navajo), Kótsoi (in Jicarilla Apache)
The Rio Grande at Big Bend National Park, on the Mexico–U.S. border
Map of the Rio Grande drainage basin
Location
Country	United States, Mexico
State	Colorado, New Mexico, Texas, Chihuahua, Coahuila, Nuevo León, Tamaulipas
Physical characteristics
Source	Canby Mountain, Continental Divide
- location	San Juan Mountains, Rio Grande National Forest[1], Colorado, United States
- coordinates	37°47′52″N 107°32′18″W / 37.79778°N 107.53833°W / 37.79778; -107.53833[2]
- elevation	12,000 ft (3,700 m)[1]
Mouth	Gulf of Mexico
- location	Cameron County, Texas; Matamoros, Tamaulipas
- coordinates	25°57′22″N 97°8′43″W / 25.95611°N 97.14528°W / 25.95611; -97.14528Coordinates: 25°57′22″N 97°8′43″W / 25.95611°N 97.14528°W / 25.95611; -97.14528[2]
- elevation	0 ft (0 m)
Length	1,896 mi (3,051 km)[1]
Basin size	182,200 sq mi (472,000 km2)[4]
Discharge
- location	Eagle Pass, Texas/Piedras Negras, Coahuila[3]
- average	2,403 cu ft/s (68.0 m3/s)[3]
- minimum	24 cu ft/s (0.68 m3/s)
- maximum	964,000 cu ft/s (27,300 m3/s)
Basin features
Tributaries
- left	Red River, Rio Hondo, Rio Pueblo de Taos, Embudo River, Santa Fe River, Galisteo Creek, Alamito Creek, Terlingua Creek, Pecos River, Devils River
- right	Conejos River, Rio Chama, Jemez River, Rio Puerco, Rio Conchos, Rio Salado, Rio Alamo, San Juan River

The Rio Grande (/ˈriːoʊ ˈɡrænd/ or /ˈriːoʊ ˈɡrɑːndeɪ/;^[5][6][7]Spanish: Río Bravo del Norte, pronounced [ˈri.o ˈβɾaβo ðel ˈnoɾte] or simply Río Bravo) is one of the principal rivers (along with the Colorado River) in the southwest United States and northern Mexico. The Rio Grande begins in south-central Colorado in the United States and flows to the Gulf of Mexico.^[8] Along the way, it forms part of the Mexico–United States border. According to the International Boundary and Water Commission, its total length was 1,896 miles (3,051 km) in the late 1980s, though course shifts occasionally result in length changes. Depending on how it is measured, the Rio Grande is either the fourth- or fifth-longest river system in North America.^[1]

The river serves as part of the natural border between the U.S. state of Texas and the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas. A very short stretch of the river serves as part of the boundary between the U.S. states of Texas and New Mexico. Since the mid–20th century, heavy water consumption of farms and cities along with many large diversion dams on the river has left only 20% of its natural discharge to flow to the Gulf. Near the river's mouth, the heavily irrigated lower Rio Grande Valley is an important agricultural region.

The Rio Grande's watershed covers 182,200 square miles (472,000 km²).^[4] Many endorheic basins are situated within, or adjacent to, the Rio Grande's basin, and these are sometimes included in the river basin's total area, increasing its size to about 336,000 square miles (870,000 km²).^[9]

Geography

Island within the Rio Grande from the North Valley in Albuquerque, New Mexico

The Rio Grande rises in the western part of the Rio Grande National Forest in the U.S. state of Colorado. The river is formed by the joining of several streams at the base of Canby Mountain in the San Juan Mountains, just east of the Continental Divide. From there, it flows through the San Luis Valley, then south into the Middle Rio Grande Valley in New Mexico, passing through the Rio Grande Gorge near Taos, then toward Española, and picking up additional water from the San Juan-Chama Diversion Project from the Rio Chama. It then continues on a southerly route through the desert cities of Albuquerque and Las Cruces to El Paso, Texas, and Ciudad Juárez, Chihuahua. In the Albuquerque area, the river flows past a number of historic Pueblo villages, including Sandia Pueblo and Isleta Pueblo. Below El Paso, it serves as part of the border between the United States and Mexico.

The official river border measurement ranges from 889 miles (1,431 km) to 1,248 miles (2,008 km), depending on how the river is measured.^[1] A major tributary, the Rio Conchos, enters at Ojinaga, Chihuahua, below El Paso, and supplies most of the water in the border segment. Other tributaries include the Pecos and the smaller Devils, which join the Rio Grande on the site of Amistad Dam. Despite its name and length, the Rio Grande is not navigable by ocean-going ships, nor do smaller passenger boats or cargo barges use it as a route. It is barely navigable at all, except by small boats in a few places; at its deepest point, the river's depth is 60 feet (18 m).^[10]

The Rio Grande rises in high mountains and flows for much of its length at high elevation; Albuquerque is 5,312 feet (1,619 m), and El Paso 3,762 feet (1,147 m) above sea level. In New Mexico, the river flows through the Rio Grande rift from one sediment-filled basin to another, cutting canyons between the basins and supporting a fragile bosque ecosystem on its flood plain. From El Paso eastward, the river flows through desert. Although irrigated agriculture exists throughout most of its stretch, it is particularly extensive in the subtropical Lower Rio Grande Valley. The river ends in a small, sandy delta at the Gulf of Mexico. During portions of 2001 and 2002, the mouth of the Rio Grande was blocked by a sandbar. In the fall of 2003, the sandbar was cleared by high river flows around 7,063 cubic feet per second (200 m³/s).^[3]

Navigation

Navigation was active during much of the 19th century,^[11] with over 200 different steamboats operating between the river's mouth close to Brownsville and Rio Grande City, Texas. Many steamboats from the Ohio and Mississippi Rivers were requisitioned by the U.S. government and moved to the Rio Grande during the Mexican–American War in 1846. They provided transport for the U.S. Army, under General Zachary Taylor, to invade Monterrey, Nuevo León, via Camargo Municipality, Tamaulipas. Army engineers recommended that with small improvements, the river could easily be made navigable as far north as El Paso.^{[citation needed]} Those recommendations were never acted upon.

The Brownsville & Matamoros International Bridge, a large swing bridge, dates back to 1910 and is still in use today by automobiles connecting Brownsville with Matamoros, Tamaulipas. It has not been opened since the early 1900s, though, when the last of the big steamboats disappeared. At one point, the bridge also had rail traffic. Railroad trains no longer use this bridge. A new rail bridge (West Rail International Crossing) connecting the U.S. and Mexico was built about 15 miles west of the Brownsville & Matamoros International Bridge. It was inaugurated in August 2015. It moved all rail operations out of downtown Brownsville and Matamoros.^[12] The West Rail International Crossing is the first new international rail crossing between the U.S. and Mexico in 105 years.^[13] The Brownsville & Matamoros International Bridge is now operated by the Brownsville and Matamoros Bridge Company, a joint venture between the Mexican government and the Union Pacific Railroad.

At the mouth of the Rio Grande, on the Mexican side, was the large commercial port of Bagdad, Tamaulipas. During the American Civil War, this was the only legitimate port of the Confederacy. European warships anchored offshore to maintain the port's neutrality, and managed to do so successfully throughout that conflict, despite occasional stare-downs with blockading ships from the US Navy. It was a shallow-draft river port, with several smaller vessels that hauled cargo to and from the deeper-draft cargo ships anchored off shore. These deeper-draft ships could not cross the shallow sandbar at the mouth of the river. The port's commerce was European military supplies, in exchange for bales of cotton.

History

The Upper Rio Grande near Creede, Colorado

Railway Bridges and the Great Customs Smelter (postcard, circa 1916)

During the late 1830s and early 1840s, the river marked the disputed border between Mexico and the nascent Republic of Texas; Mexico marked the border at the Nueces River. The disagreement provided part of the rationale for the US invasion of Mexico in 1846, after Texas had been admitted as a new state. Since 1848, the Rio Grande has marked the boundary between Mexico and the United States from the twin cities of El Paso, Texas, and Ciudad Juárez, Chihuahua, to the Gulf of Mexico. As such, crossing the river was the escape route used by some Texan slaves to seek freedom. Mexico had liberal colonization policies and had abolished slavery in 1828.^[14]

In 1899, after a gradual change to the river position, a channel was dug for flood control which moved the river, creating what was called Cordova Island, which became the center of the Chamizal dispute. Resolving the dispute took many years and almost resulted in a 1909 combined assassination attempt on the American and Mexican presidents.

In 1944, the US and Mexico signed a treaty regarding the river,^[15] and in 1997, the US designated the Rio Grande as one of the American Heritage Rivers. Two portions of the Rio Grande are designated National Wild and Scenic Rivers System, one in northern New Mexico and the other in Texas, at Big Bend National Park.

In mid-2001, a 328-foot (100 m)-wide sandbar formed at the mouth of the river, marking the first time in recorded history that the Rio Grande failed to empty into the Gulf of Mexico. The sandbar was dredged, but reformed almost immediately. Spring rains the following year flushed the reformed sandbar out to sea, but it returned in mid-2002. By late 2003, the river once again reached the Gulf.^[3]

River modifications

View of the Rio Grande from Overlook Park, White Rock, New Mexico

The United States and Mexico share the water of the river under a series of agreements administered by the International Boundary and Water Commission (IBWC), US-Mexico. The most notable of these treaties were signed in 1906 and 1944.^[16][17] The IBWC traces its institutional roots to 1889, when the International Boundary Committee was established to maintain the border. The IBWC today also allocates river waters between the two nations, and provides for flood control and water sanitation.

Use of that water belonging to the United States is regulated by the Rio Grande Compact, an interstate pact between Colorado, New Mexico, and Texas. The water of the Rio Grande is over-appropriated: that is, more users for the water exist than water in the river. Because of both drought and overuse, the section from El Paso downstream through Ojinaga was recently tagged "The Forgotten River" by those wishing to bring attention to the river's deteriorated condition.^[18]

Rio Grande in west El Paso near the New Mexico state line

Dams on the Rio Grande include Rio Grande Dam, Cochiti Dam, Elephant Butte Dam, Caballo Dam, Amistad Dam, Falcon Dam, Anzalduas Dam, and Retamal Dam. In southern New Mexico and the upper portion of the Texas border segment, the river's discharge dwindles. Diversions, mainly for agricultural irrigation, have increased the natural decrease in flow such that by the time the river reaches Presidio, little or no water is left. Below Presidio, the Rio Conchos restores the flow of water.^[1] Near Presidio, the river's discharge is frequently zero. Its average discharge is 178 cubic feet per second (5 m³/s), down from 945 cubic feet per second (27 m³/s) at Elephant Butte Dam. Supplemented by other tributaries, the Rio Grande's discharge increases to its maximum annual average of 3,504 cubic feet per second (99 m³/s) near Rio Grande City. Large diversions for irrigation below Rio Grande City reduce the river's average flow to 889 cubic feet per second (25 m³/s) at Brownsville and Matamoros.^[3]

Crossings

The major international border crossings along the river are at Ciudad Juárez and El Paso; Presidio and Ojinaga; Laredo and Nuevo Laredo; McAllen and Reynosa; and Brownsville and Matamoros. Other notable border towns are the Texas/Coahuila pairings of Del Rio–Ciudad Acuña and Eagle Pass–Piedras Negras.

Names and pronunciation

The Rio Grande (Rio del Norte) as mapped in 1718 by Guillaume de L'Isle

Río Grande is Spanish for "Big River" and Río Grande del Norte means "Great River of the North". In English, Rio Grande is pronounced either /ˈriːoʊ ˈɡrænd/ or /ˈriːoʊ ˈɡrɑːndeɪ/. Because río means "river" in Spanish, the phrase Rio Grande River is redundant.

In Mexico, it is known as Río Bravo or Río Bravo del Norte, bravo meaning (among other things) "furious" or "agitated".

Historically, the Pueblo and Navajo peoples also had names for the Rio Grande/Rio Bravo:

• 
  mets'ichi chena, Keresan, "Big River"


• 
  posoge, Tewa, "Big River"


• 
  paslápaane, Tiwa, "Big River"


• 
  hañapakwa, Towa, "Great Waters"

The four Pueblo names likely antedated the Spanish entrada by several centuries.^[19]

• 
  Tó Baʼáadi, Navajo, "Female River" (the direction south is female in Navajo cosmology)^[20]
  

Rio del Norte was most commonly used for the upper Rio Grande (roughly, within the present-day borders of New Mexico) from Spanish colonial times to the end of the Mexican period in the mid-19th century. This use was first documented by the Spanish in 1582. Early American settlers in South Texas began to use the modern 'English' name Rio Grande. By the late 19th century, in the United States, the name Rio Grande had become standard in being applied to the entire river, from Colorado to the sea.^[19]

By 1602, Río Bravo had become the standard Spanish name for the lower river, below its confluence with the Rio Conchos.^[19]

Tributaries

The largest tributary of the Rio Grande by discharge is the Rio Conchos, which contributes almost twice as much water as any other. In terms of drainage basin size, the Pecos River is the largest.

See also

Notes

Further reading

• D¡az, George T. Border Contraband: A History of Smuggling across the Rio Grande (University of Texas Press, 2015) xiv, 241 pp.


• 
  Horgan, Paul (1991). Great River: The Rio Grande in North American History (4th ed.). Hanover, NH: Wesleyan University Press. ISBN 0-8195-6251-3.; Pulitzer Prize


• 
  Kearney, Milo; Anthony K. Knopp (1995). Boom and Bust: The Historical Cycles of Matamoros and Brownsville. Austin, Tex: Eakin Press. ISBN 978-0-89015-815-9.
  


• 
  Kelley, Pat (1986). River of Lost Dreams: Navigation on the Rio Grande. Lincoln: University of Nebraska Press. ISBN 978-0-8032-2712-5.
  


• 
  Lea, Tom (1957). The King Ranch. Boston: Little, Brown. ISBN 978-0-316-51745-4.
  

Primary sources

• 
  Coker, Caleb (1992). The News from Brownsville: Helen Chapman's Letters from the Texas Military Frontier, 1848-1852. Austin, Tex: Texas State Historical Association. ISBN 0-87611-115-0.
  

External links

Wikimedia Commons has media related to Rio Grande (river).

• Border Stories: the only hand pulled ferry on the Rio Grande (video)


• 
  1854 map of Rio Grande entrance (hosted by the Portal to Texas History).


• Rio Grande Cam – in Mission Texas. Mexico is on the left and the US is on the right.