NABSQNO 13T-454150-4471070An unnamed fin natural arch, Larimer County, Colorado Photo by Jay Wilbur NABSQNO 13T-454150-4471070. This small unnamed fin natural arch is eroded through granite. It is located above US Highway 34, in the town of Estes Park, Larimer County, Colorado. It has a span of about 6 feet.
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