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Rio Grande

geography Maturity 7-9 Next article →

The Rio Grande is a major river in North America. It is the fourth longest river in the United States by its main stem. In Mexico, people call it the Río Bravo (del Norte). The Navajo people call it Tó Ba'áadi. This river is a vital water source for seven states across the United States and Mexico. It flows primarily through arid and semi-arid lands. These are regions that are very dry and receive little rain.

Rio Grande Creede
Rio Grande Creede

The river begins its journey in south-central Colorado. It rises in the western part of the Rio Grande National Forest. Several streams join together at the base of Canby Mountain. This occurs in the San Juan Mountains, east of the Continental Divide. From the divide, the water flows through the San Luis Valley. It then travels south into New Mexico. The river passes through the Rio Grande Gorge near Taos.

PXL 20230824 182108745
PXL 20230824 182108745

As the river moves south, it collects more water. It receives water from the Rio Chama. It also gets water from the Colorado River basin via the San Juan-Chama Diversion Project. The river flows through the Rio Grande rift. This is a geological feature where the land has pulled apart. The river cuts canyons between sediment-filled basins. It supports a fragile bosque ecosystem on its flood plain. A bosque is a forest found along a river in a dry area.

Rio Grande-2
Rio Grande-2

The Rio Grande has a very long history. Millions of years ago, the river system was different. The basins were initially bolsons. These are depressions with no external drainage. An axial river existed in the Espanola Basin 13 million years ago. Eventually, the river integrated different basins to the south. About 800,000 years ago, it joined the Pecos River. Much later, the river reached the Gulf of Mexico.

Rio Grande White Rock Overlook Park View 2006 09 05
Rio Grande White Rock Overlook Park View 2006 09 05

Humans have lived near the river for thousands of years. Early groups like the Folsom and Clovis cultures left sites in the valley. Later, the Oshara tradition began cultivating maize around 1750 BCE. Around 1130 CE, a drought caused the Ancestral Puebloan culture to collapse. Many people migrated to the fertile Rio Grande valleys. They lived alongside other groups like the Apache. Spanish explorers arrived in the 1500s. In 1598, Don Juan de Oñate established the colony of Santa Fe de Nuevo Méjico.

Mexicum in hac forma in lucem (2674570748)
Mexicum in hac forma in lucem (2674570748)

The river serves as an international border today. It separates the U.S. state of Texas from several Mexican states. These include Chihuahua, Coahuila, Nuevo León, and Tamaulipas. It also forms a partial boundary between New Mexico and Texas. Because of human needs, the river's flow is heavily managed. People use water for irrigation in the Mesilla and Lower Rio Grande Valleys. Cities like Albuquerque and Las Cruces also use the water. Consequently, only 20 percent of the water reaches the Gulf of Mexico.

Bridge of the Americas (El Paso–Ciudad Juárez), June 2016
Bridge of the Americas (El Paso–Ciudad Juárez), June 2016

Transportation on the river has changed significantly over time. In the 19th century, over 200 steamboats operated on the river. They moved between the mouth near Brownsville and Rio Grande City. During the Mexican-American War in 1846, the U.S. Army used steamboats for transport. Today, the river is generally not navigable for large cargo barges. Navigation is mostly only possible near the mouth. Instead, people use bridges to cross the water. A new international rail crossing opened in August 2015.

Railway Bridges and the Great customs smelter
Railway Bridges and the Great customs smelter
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🖼️ Images & Media (12)
File:Rio Grande-2.jpg
Rio Grande-2.jpg
File:Rio Grande EP Upper Valley.jpg
Rio Grande EP Upper Valley.jpg
File:PXL 20230824 182108745.jpg
PXL 20230824 182108745.jpg
File:Rio Grande White Rock Overlook Park View 2006 09 05.jpg
Rio Grande White Rock Overlook Park View...
File:Rio Grande Creede.jpg
Rio Grande Creede.jpg
File:Mexicum in hac forma in lucem (2674570748).jpg
Mexicum in hac forma in lucem (2674570748).jpg
File:Railway Bridges and the Great customs smelter.jpg
Railway Bridges and the Great customs smelter.jpg
File:Bridge of the Americas (El Paso–Ciudad Juárez), June 2016.jpg
Bridge of the Americas (El Paso–Ciudad...
File:Rio Grande SE of Falcon Reservoir, Municipality of Mier, Tamaulipas, Mexico (12 August 2007).jpg
Rio Grande SE of Falcon Reservoir,...
File:Rio Grande Ariel July 2022.png
Rio Grande Ariel July 2022.png
File:1 Wtr Trtmnt Plnt A Cropped.jpg
1 Wtr Trtmnt Plnt A Cropped.jpg
File:Rio grande in 1718.jpg
Rio grande in 1718.jpg
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