Part of the former quarry town of Stout lies beneath the south end of Horsetooth Reservoir near Fort Collins, Colorado.
Stout grew around quarrying in the area, once a major source of sandstone for buildings and sidewalk paving in major cities such as Denver, Chicago and Omaha. By the early 1880s the Union Pacific railroad had reached Stout and the town was busy with many carloads of stone leaving by rail daily.
Demand for stone had waned by the turn of the 20th century, and the town was largely abandoned by the 1920s. Remaining structures were cleared in the 1940s to prepare for flooding to create the Horsetooth Reservoir in 1949. The remnants of some structures, such as the old boarding hotel can still be seen to the south of the reservoir.