The mouth of Boulder Canyon looking north toward Red Rocks, with the Boulder-Colorado Sanitarium in the distance at right. Brierley Farm, Red Rock Home, Yount Mill and the Marshall Gold Extraction Works are behind the rolling stock of the Colorado & Northern, which sits on a spur in the foreground. Between 1898 and 1904. Photo Courtesy of Carnegie Branch Library for Local History, Boulder Historical Society Collection.

2008 photo by John McKenzie. 1800s:Local call number at Carnegie Branch Library for Local History: (neg. #2432) BHS 218-2-1 PHOTO