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<br /> <br />IN REPL'r" R..Er~C~R _ 740 <br />ADM - 1.10 <br /> <br />TO: <br /> <br />FROM: <br /> <br />SUBJ: <br /> <br />United States B~la1Znent of the Interior <br /> <br />GRAND CANYON MONITORING AND RESEARCH CENTER <br />2255 N. GEMINI DR" MS-5000 <br />FLAGSTAFF, ARIZONA 86001 <br /> <br />JUl Z 5 2lI02 <br /> <br />MEMORANDUM <br /> <br />Glen Canyon Dam Adaptive Management and Technical Group <br />Representatives, GCMRC Cooperating Scientists a~ <br /> <br />Ted S. Melis, Physical Science Program Managf'-il. <br /> <br />Recent USGS publication by Webb et al. - Observations o/Environmental <br />Change in Grand Canyon, Arizona <br /> <br />The attached report, Observations 0/ Environmental Change in Grand Canyon, Arizona <br />by Webb, Melis and Valdez, has recently been accepted by the GCMRC as a final <br />deliverable, and published by the United States Geological Survey. <br /> <br />Written in cooperation with its physical- and biological-science cooperators, this report is <br />an attempt to provide managers and decision makers with a larger context for evaluating <br />the Colorado River ecosystem's resource conditions prior-to and following closure of <br />Glen Canyon Dam. It is hoped that infonnation on observations of native fishes and sand <br />resources in Grand Canyon in the pre-dam era will be of particular interest and use. <br /> <br />Infonnation contained in this article reflects the authors' monitoring and research efforts <br />funded by the fonner GCES program through 1996, as well as GCMRC-sponsored <br />monitoring and research carried out Ihrough later agreemenls with the USGS - Water <br />Resource Discipline during Fiscal Years 1998 through 2002. <br /> <br />Please review this report and share it with your staff and other interested parties. Feel <br />free to contact me at (520) 556-7282, with any questions you have regarding these <br />findings, or the published conclusions derived from them. Dr. Webb can also be reached <br />at (520) 670-6671, ext 238. Dr. Valdez can be reached at (435) 757-7655. <br />