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A data-collection network was established in 1980 a drainage basin which may be surface mined for coal work plan set up to study the premining hydrology of in northwestern Colorado in This report describes the this area near Steamboat Springs, Routt County, Colorado. The bedrock, alluvial, and surface-water systems, as well as the climatic inputs to these systems, are monitored for this study. INTRODUCTION Many recent studies of the hydrology of coal-mining areas were started after mining had begun. This sequence makes it difficult to determine man-induced impacts on the natural hydrology. In northwestern Colorado (fig. 1) an opportunity was available to begin a study within a watershed where surface-mining activities are expected to start in approximately 3 years. This time frame should permit evaluation of the hydrology of the natural system. The study was begun in 1980 by the U.S. Geological Survey in cooperation with the U.S. Bureau of Land Management. After mining begins, the disturbance from surface mining can be monitored and evaluated. Purpose of Study The purpose of the study is to define the hydrologic characteristics of overburden aquifers, coal aquifers, and underburden aquifers to determine the interaction of these aquifers with each other, the surface water, and alluvial aquifers that border and underlie the principal stream of the area. Conceptual Model The structural controls (fig. 2) in the study area show that the surficial bedrock aquifers are not subject to interbasin recharge. Consequently the hydrology of the study area is dependent only upon intrabasin interactions between bedrock aquifers, alluvial aquifers, and streamflow, all of which depend upon precipitation inputs. 9 Q r o o p r * o ' o o C U * < p I n P P c u o r t r « < c u 3 . o * o C U p r * P P c r 2 5 ' w o o _ « r t o C U EXPLANATION LEWIS SHALE WILLIAMS FORK FORMATION u D 7000FAULT U, upthrown side; D, downthrown side STRUCTURE CONTOUR Altitude is National Vertical Geodetic Datum of 1929. Contours drawn on top of Trout Creek sandstone member PROPOSED STRIP-MINING AREA DRAINAGE BASIN BOUNDARY TWENTYMILE SANDSTONE TROUT CREEK SANDSTONE MANCOS SHALE R.87W. 107°10'. Base from U.S. Geological Survey Mount Harris, Pilot Knob, Elkhead Creek, and Daton Peak quadrangles 2MILES Geology by N.V M.R. Campbell, J.B. Eby

Plan for hydrologic study of an area to be surface mined for coal in northwestern Colorado