New Outdoor
Aspen Center for Environmental Studies (ACES) Description Aspen Center for Environmental Studies operates Hallam Lake, a 25-acre nature preserve and its founding campus, at 100 Puppy Smith Street in Aspen’s
Hallam Lake (ACES) Description Hallam Lake is a 25-acre nature preserve and environmental education center in Aspen, Colorado, serving as the original location of the Aspen Center for Environmental Studies.
