This report is the thirteenth in a series prepared by the U.S. Geological Survey in cooperation with the Utah Department of Natural Resources, Division of Water Rights, that describes the water resources of selected basins in western Utah. The purpose of this series of reconnaissances is to analyze available hydrologic data, to evaluate present and potential water-resource development, and to identify additional studies that might be needed in the future to provide a fuller understanding of the hydrologic system.