Looking back at Dercum Mountain – 11, 640 ft. February 18, 2013 by Matt ThomasLooking back at Dercum Mountain – 11, 640 ft. Keystone Ski Resort About Matt Thomas Matt is an avid writer and explorer, who loves to showcase his home state of Colorado. His favorite place to be is right here in the Centennial State. Previous Post:Looking back at Dercum Mountain – 11, 640 ft.