ABSTRACT: This document renews the original 1997 Charter authorizing the Adaptive Management Work Group (AMWG), a federal advisory committee functioning as part of the Glen Canyon Dam Adaptive Management Program (GCDAMP). The 1992 Grand Canyon Protection Act directs the Secretary of the Interior to operate Glen Canyon Dam in such a manner as to protect, mitigate adverse impacts to, and improve the values for which Grand Canyon National Park and the Glen Canyon National Recreation Area were established, including but not limited to natural and cultural resources and visitor use. The Act also calls for implementation of long-term monitoring programs and activities that will ensure Glen Canyon Dam is operated to that end. As part of long-term monitoring, the Secretary’s Record of Decision mandates development and initiation of the GCDAMP, which provides for monitoring the results of the operating criteria and plans adopted by the Secretary and changes to those operating criteria and plans. GCDAMP includes the AMWG, which will facilitate the GCDAMP, recommend suitable monitoring and research programs, and make recommendations to the Secretary as required to meet the requirements of the Act.