Contains data sets, including locations and periods of record for stream gages, reservoir gages, and meteorological stations; a 500-meter-resolution Digital Elevation Model; grid-node locations for the Eta numerical weather prediction model. Also contains digital map data sets of geology, land use, streams, large reservoirs, average annual runoff, average annual precipitation, average annual temperature, average annual heating and cooling degree days, hydrologic units and state and county boundaries. Also includes digital index maps for LANDSAT scenes, and for the USGS 1:250,000, 1:100,000 and 1:24,000-scale map series and well as a listing of Hydro-Climatic Data Network stream gages.