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INTRODUCTION Public concerns regarding the impacts associated with the Glen Canyon Dam operations on the Colorado River environment in the Grand Canyon resulted in a U.S. Department of Interior decision to implement the GCES (Glen Canyon Environmental Studies) in 1982. A critical component of the research effort and the base for long-term monitoring is the development and maintenance of a consolidated and integrated long-term data base and GIS (geographic information system). A previous report entitled, "Developing A Geographic Information System For Resource Monitoring On the Colorado River In The Grand Canyon," discussed and outlined the development process for the GIS effort. In this report, the objective is to explain how the GCES/GIS (Glen Canyon Environmental Studies/Geographic Information System) data base is being used for the long-term monitoring of cultural, natural, and recreational resources on the Colorado River in the Grand Canyon. The overall objective of the GCES/GIS program is to develop and use a geographically referenced data base as the consolidation vehicle for an integrated, ecosystem-based monitoring program. Prior to full-scale development of the GCES/GIS data base a pilot study was conducted to determine the data sets, methodologies, and computer protocols best suited for the study. This report documents the pilot study results and establishes a template to be used for the development of the remaining sites. Development of the GCES/GIS long-term monitoring pilot has been a coordinated effort between the Bureau of Reclamation's Remote Sensing and Geographic Information Group and the Glen Canyon Environmental Studies Group. The GCES Office in Flagstaff, Arizona, provides coordination, geographic control, and verification of information and integration of results. The Technical Service Center (the Remote Sensing and Geographic Information Group) is responsible for program and template development. The participants in the data collection effort include researchers from the NPS (National Park Service), USGS (U.S. Geological Survey), WAPA (Western Area Power Administration), U.S. Fish and Wildlife Service, Arizona Fish and Game, Western Native American groups, Hopi Tribe, Navajo Nation, Hualapai Tribe, contractors, and academic institutions. The GIS data sets developed by these entities are useful in satisfying their specific analysis, and are also being used as tools by other contributors. This report will describe and discuss the following: • The strategy for development of the initial GCES/GIS data base. The production of the base maps The design of the GCES data base The consolidation of information into the GCES/GIS • The strategy and development of the long-term monitoring pilot study. Feature Selection Applied Research Results