Valmont power plant from the south edge of what was formerly called Weisenhorn Lake, with Arapahoe Road in the foreground and the tracks of the Colorado and Southern Railroad running along the water's edge. 1931 or 1932. Photo Courtesy of Carnegie Branch Library for Local History, Boulder Historical Society Collection.

2008 photo by Ken Sanville. 1930s: Local call number at Carnegie Branch Library for Local History: BHS 214-2-48 PHOTO #1 (Tangen photo #12687)