The U.S. Geological Survey (USGS) has developed computer models to simulate flow routing and river operations in the upper Carson River Basin. Data are needed for model calibration and initiation, and for comparison of model output with observations. The USGS and other agencies have been operating hydrologic data-collection networks in the upper Carson River Basin for more than 20 years. This report summarizes selected hydrologic data for water years 1978-97 which are necessary to run and test the flow-routing and river-operations models. Specifically, this report describes a data base consisting of records of surfacewater flow at 86 gaging stations, precipitation at 5 sites, evaporation at 2 sites, estimates of phreatophyte evapotranspiration for 20 reaches, streamflow forecasts at 3 sites, and estimates of groundwater gain or loss for 33 reaches within the upper Carson River Basin. Until recently (1997), a compilation of these types of waterresources information did not exist. All of the data are available in electronic format.