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In undertaking a multidisciplinary basinwide assessment of water quality, sources of available water-related information for the basin, both descriptive and quantitative, need to be identified; therefore, in 1994 and 1995, as a first step in conducting the Upper Colorado River Basin investigation, already-existing water-related publications and data for the basin were compiled and organized. A computerized literature search was done to identify many of the publications that would be useful in the water-quality assessment of the basin. In addition, Federal, State, and local government agencies and private organizations working, or having an interest, in the study unit were contacted regarding their knowledge or possession of water-related publications and data for the basin. Puroose and Scooe This report presents a bibliography, coauthor and subject indices, and data sources of water- related information and publications for the Upper Colorado River Basin in Colorado and Utah and is a centralized source for this information. The bibliographic part of the report is a comprehensive collection of approximately 1,400 references on water-related studies conducted in the Upper Colorado River Basin. Journal articles, published reports and books, unpublished master's theses and doctoral dissertations, conference proceedings, book reviews, approved in-press publications, and maps dating from 1872 through February 1995 are referenced. Unpublished manuscripts are not included. For some bibliographic citations, abstracts have been provided. The listing of water-related data sources for the Upper Colorado River Basin includes information on surface- and ground-water hydrology and aquatic biology. The hydrologic data consist of streamflow and diversion records; water-quality information on inorganics, organics, pesticides, salinity, and trace metals; water-level records; and well data. The aquatic-biology sources provide information on algae, fish, and invertebrates in the basin. Descriotion of Study Unit The Upper Colorado River Basin study unit includes parts of the States of Colorado and Utah. More than 99 percent of the approximately 17,800 square-mile drainage area is located in Colorado (fig. 1). The main stem of the Colorado River originates in the mountains of central Colorado and flows about 230 miles southwest into Utah. The major tributaries to this part of the Colorado River are the Blue, Eagle, Roaring Fork, and Gunnison Rivers (fig. 1). These tributaries also originate in the mountainous eastern and southern parts of the study unit that are bounded by the Continental Divide. The two-State study unit is largely rural and has a population of about 234,000 people (Bureau of Census, 1991), most of whom reside in Colorado. The majority of the population in the basin is concentrated in the Grand Junction, Colorado, area. Population fluctuates during the year as a result of tourism, a major year-round industry in the basin, and large increases in population occur during the summer and winter. Most of the mountainous regions in the study unit have been set aside specifically for recreational activities. In the river valleys and on the plateaus, irrigated agriculture is the principal land use. Mining was the first major industry in the study unit and still is an important industry in some locations. Urban land use, presently (1995) a small land-use category in the study unit, is increasing as a result of people moving from more densely urbanized areas of the country to the less densely urbanized mountain areas in the West. 2 Bibliography. Indices, and Data Sources of Water-Related Studies, Upper Colorado River Basin, Colorado and Utah. 1872-1995