In 1977, seven coreholes were drilled on Naval Oil Shale Reserve No. 1 (NOSR 1) in Garfield County, Colorado, to gather information on the groundwater resource, oil shale resource, and stratigraphy. Three additional coreholes were drilled on NOSR 1 in 1978. Limited aquifer testing was performed in both 1977 and 1978. Toward the end of 1979 and early in 1980, all geologic and hydrologic data available for NOSRs 1 and 3 were assembled and subjected to detailed evaluation. Planning for the summer 1980 field program on NOSRs 1 and 3 was based on this evaluation. The evaluation is now documented here, with data samples and those maps and charts necessary for understanding the water resources on NOSRs 1 and 3. A similar evaluation is scheduled for data gathered in the 1980 field program. Publication of a comprehensive data book is planned toward the end of FY 1981, along with a final report characterizing specifically the hydrology of NOSRs 1 and 3. Compiled for this report are data on surface water and precipitation gathered by the US Geological Survey (USGS) (under contract to DOE), groundwater information from the coreholes on NOSR 1, and geological and groundwater data from various sources throughout the Piceance Basin. 139 references, 26 figures, 10 tables.