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Sierra Grande
Sierra Grande volcano.jpg
Sierra Grande seen from the top of Capulin Volcano.
Highest point
Elevation 8,723 ft (2,659 m) NAVD 88
Prominence 1,880 ft (570 m)
Location Union County, New Mexico, U.S.
Topo map USGS Capulin
Mountain type Stratovolcano
Volcanic field Raton-Clayton volcanic field
Easiest route Hike

Sierra Grande is an extinct stratovolcano in northeastern New Mexico that rises 2,200 feet above the surrounding plain. It is part of the inactive Raton-Clayton volcanic field.


On a clear day, Sierra Grande can be seen from as far away as Texline, Texas, as well as from the summits of the Culebra Range in southern Colorado and northern New Mexico. The eastern slopes of Sierra Grande are the easternmost point in the United States with an elevation of more than 8,000 feet (2,400 m) above sea level, and the peak is the highest in the United States east of 104 degrees west.

U.S. Highway 64, U.S. Highway 87 and the Colorado and Southern Railway run along the north and east of the volcano. The town of Des Moines is just to the northeast. To the northwest is Capulin Volcano National Monument featuring Capulin Volcano, an extinct cinder cone also in the Raton-Clayton volcanic field.


Sierra Grande is the largest volcano in the Raton-Clayton volcanic field. Its flows range in age from 3.8 to 2.6 million years. The volcano is largely composed of two-pyroxene andesite, a rock type found almost nowhere else in the Raton-Clayton volcanic field.

Sierra Grande 221
Sierra Grande as seen from the north along US Highways 64 and 87
Sierra Grande Andesite
Andesite from a 1.9 million year old lava flow, on the eastern side of Sierra Grande.
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