Adaptive management is a policy framework within which an iterative pr
ocess of decision making is followed based on the observed responses t
o and effectiveness of previous decisions. The use oi adaptive managem
ent allows science-based research and monitoring of natural resource a
nd ecological community responses, in conjunction with societal values
and goals, to guide decisions concerning man's activities. The adapti
ve management process has been proposed for application to hydropower
operations at Glen Canyon Dam on the Colorado River, a situation that
requires complex balancing oi natural resources requirements and compe
ting human uses. This example is representative of the general increas
e in public interest in the operation of hydropower facilities and pos
sible effects on downstream natural resources and of the growing confl
icts between uses and users of river-based resources. This paper descr
ibes the adaptive management process, using the Glen Canyon Dam exampl
e, and discusses ways to make the process work effectively in managing
downstream natural resources and biodiversity.