TheRio Grande Gorge is a geological feature in northernNew Mexico where the watercourse of theRio Grande follows an erodedchasm. Beginning near theColorado border, the approximately 50-mile (80 km) gorge runs from northwest to southwest ofTaos, New Mexico, through thebasalt flows of theTaos Plateau volcanic field. The gorge depth is 800 feet (240 m) just south of theRio Grande Gorge Bridge, which spans the gorge 10 miles (16 km) northwest of Taos.
Geologically, the Rio Grande Gorge is a canyon,[1] carved out by erosion over the last several million years.[2] The Rio Grande Gorge and its river follow a topographical low within the largerRio Grande Rift; a mixture of volcanic activity, shifting tectonic plates, and erosion of layers of gravels and lava yielded the recognizable narrow, deep gorge visible today.[3][4][5][6]
The canyon ecosystem descends 800 feet (240 m) from rim to river, creating a unique diversity in plant and animal life. Ancient piñon and juniper forests are home to 500-year-old trees. Wildlife include mule deer, red-tailed hawk, mountain blue-bird, prairie dog and big horn sheep.
The climate is semi-arid with summer thunderstorms common in July and August, and snow possible from November through March. Summer temperatures range from 45 to 90 °F (7 to 32 °C) and in winter from −15 to 45 °F (−26 to 7 °C).[7]
In 1968, theRio Grande was among the first eight rivers theUS Congress designated into theNational Wild and Scenic Rivers System to protect outstanding resources values. The Wild and Scenic River flows through the Rio Grande Gorge Recreation Area. The recreation areas include theWild Rivers area in the north and theOrilla Verde area in the south,[8] which provide hiking, boating, fishing and camping facilities.[7][9]
The gorge and 242,500 acres (98,100 ha) of surrounding land was designated anational monument,Rio Grande del Norte National Monument, on March 25, 2013.[10]
The gorge has Class II to Class V white water rapids that are managed for recreation by The U.S.Bureau of Land Management (BLM). The BLM maintains two developed recreation areas along the river that include hiking, biking and other recreational opportunities.[7] In New Mexico, The Rio Grande has two main sections for rafting near Taos: the Taos Box and the Racecourse Run. The Taos Box, a more dramatic, deep canyon, is famous for its big, technical Class IV rapids, while the Racecourse Run is a Class III stretch better suited for first-time rafters and families.[11]
The gorge is also the site of many ancientpetroglyphs. At the bottom of the gorge, theRio Grande is flanked by hiddenhot springs and many ruins. The formerChili Line also ran there.[citation needed]
NASA geologically trained theApollo Astronauts at the site in March and Sept. 1971, because of the striking similarities to the Apollo 15 landing site. Astronauts who would use this training on the Moon includedApollo 15'sDavid Scott andJames Irwin,Apollo 16'sJohn Young andCharlie Duke, andApollo 17'sJack Schmitt. Notable geologist instructors includedWilliam R. Muehlberger.[12]
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Media related toRio Grande Gorge at Wikimedia Commons36°28′35″N105°44′02″W / 36.47652°N 105.73380°W /36.47652; -105.73380
