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Great Sand Dunes National Park and Preserve became a United States national park on September 13, 2004. It is in the southern part of the American state of Colorado, in the American Southwest. The park contains 132 mi² (343 km²)
The sand dunes rise close to 230 meters (about 750 feet) from the floor of the San Luis Valley in front of the Sangre de Cristo Mountains, covering about 78 square kilometers (about 30 square miles). They are the tallest sand dunes in North America.
American history
They were made a national monument in 1932. On November 22 2000, United States President Bill Clinton signed the Great Sand Dunes National Park and Preserve Act of 2000, aiming at ultimate national park status, after more land was acquired.
Scenery
According to the National Park Service web site below (references), they now also contain
- alpine lakes and tundra, six peaks over 13,000 feet in elevation, ancient spruce and pine forests, large stands of aspen and cottonwood, grasslands, and wetlands — all habitat for diverse wildlife and plant species.
Fun for kids of all ages
Getting to the dunes requires walking across the wide and shallow Medano Creek, which only flows spring to early summer. Many run up the dunes, simply for the fun of rolling down again. Some actually ski the dunes.
You might imagine you're in the Sahara Desert or a Western movie. Hiking is permitted, with the warning the sand can get hot in the summer, up to 60 Celsius (~140 Fahrenheit). The area gets snow in the winter. Some go on pack trips with horses.
Access
The closest city is Alamosa, Colorado, though Colorado Springs, Denver and Albuquerque, New Mexico are not far off. Consult the references for more information.
Natural History
Anyone who visits the dunes has to wonder, "Where did such a bizarre feature come from? Why here?" They trace to perhaps 12,000 years ago.
The dunes were formed from sand deposits of the Rio Grande River and its tributaries, flowing through the San Luis Valley. Over the ages, westerly winds have picked up sand particles as they flew over the Rocky Mountains from the river flood plain. As the wind lost power before crossing the Sangre de Cristo mountains, the sand was deposited on the east edge of the valley. This continues, and the dunes are slowly enlarging by the wind that daily changes the shape of the dunes. There are areas of black sand which are deposits of magnetite, a crystalline black oxide of iron.
External links and references
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