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Alamosa County

Updated 2022-11-02
  • Great Sand Dunes

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    With heights of up to 750 feet, the Great Sand Dunes in Alamosa County are the highest sand dunes in North America. They were formed around 12,000 years ago, as wind continuously blew sediment from the upper Rio Grande River westward across the San Luis Valley, piling it at the foot of the Sangre de Cristo Mountains.
    Great Sand Dunes
  • Alamosa County

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    Alamosa County was established in 1913, thanks to efforts from Colorado state senator William "Billy" Adams.
    Alamosa County
  • Alamosa County on Google Map

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    Alamosa County's seat is Alamosa, Spanish for "cottonwood grove." The county currently has a population of 16,253.
    Alamosa County on Google Map
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