Looking down on the volcano at Dotsero in 1939. "The most recent lava flow in Colorado occurred in Eagle County. This was approximately 4,000 years ago ( think Stonehenge) as determined by radiocarbon dating of a tree found in the ash in 1962. Local historians weren’t available for documentation purposes, however, according to an article written by Allen Best in 1990 [Vail Trail Dec. 7, 1990], there would have been a native American local population...