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Where does the Rio Grande begin and end?

From its headwaters in the San Juan Range of the Colorado Rockies to the Gulf of Mexico at Brownsville, Texas, the Rio Grande draws from 11 percent of the continental US, with much of that being drought-prone land.



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Who owns the Rio Grande in Texas? The United States and Mexico share the waters of the Rio Grande. The U.S.-Mexico border lies in the middle of the river from El Paso and Juárez to its delta at the Gulf of Mexico east of Brownsville and Matamoros in South Texas. In Mexico, the federal government owns the river water.

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Key Facts & Information
  • The Rio Grande is the fifth longest river in North America (1,900 miles).
  • It forms a border between Texas and Mexico.
  • The Rio Grande begins in the Rocky Mountains and flows into the Gulf of Mexico in the south.
  • The watershed of the Rio Grande is approximately 335,000 square miles.


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Although snowmelt from the San Juan Mountains of Colorado (Fig. 7) is a major source of water for the Rio Grande, runoff from northern Mexico also contributes to its flow. As in all arid to semiarid regions, the waters of the Rio Grande River are highly sought after and overallocated.

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At the river's headwaters, the water is “pristine,” Ganjegunte said. By the time the river reaches El Paso, the salinity of the water is above 1,000 parts per million. Water above 1,000 parts per million is no longer considered freshwater and, while still safe to drink, is above secondary drinking water standards.

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The Rio Grande River in the United States, known as the Río Bravo (or, more formally, the Río Bravo del Norte) in Mexico, is a river, 1,885 miles (3,034 km) long, and the fourth longest river system in the United States.

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Today, the 20th-longest river in the world is also one of the ten most endangered. The Rio Grande is still vital to its communities and visitors: agriculture, mining, and recreation are the three top industries along this river and form the base of our local economy. It's our responsibility to keep it thriving!

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Mexico had claimed a huge part of land, roughly around 5,000,000 kilometers squared.

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Several major drainages feed into the Rio Grande. Predominant surface water features that feed into the Rio Grande above the Otowi gage, in the Upper Rio Grande are the Red River, Rio Hondo, Pueblo de Taos, Santa Barbara, Embudo Creek, and the Rio Chama.

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