The United States acknowledged the Arapaho and Cheyenne peoples in the Fort Laramie Treaty of 1851 as their traditional territory in the Boulder and St. Vrain valley. Haystack area was the campground for the Arapaho tribe. In addition, Haystack Mountain was a lookout for herds of bison, deer, any travelers or fur traders. It was easy to see any movement since there were few trees.
Drone Photo, September 2021 ~ Courtesy James “Tito” Roberts