Hydrologic data collected during October 1, 1991, through September 30, 1992, in the Puerco River Basin, Western New Mexico, are summarized. The effects of uranium mining and a 1979 tailings pond spill, in combination with naturally occurring and potentially hazardous trace elements, have created a concern that surface water and ground water in the Puerco River Basin may be unsafe for irrigation, livestock watering, and domestic use; therefore, a data collection network was established to monitor the suitability of the water resources in the Puerco River Basin. The data collection network consisted of one streamflow-gaging station, three water-well dusters, and nine streambed sites. The network is located along a reach of the Puerco River beginning near the confluence of the Puerco River and Pipeline Arroyo and ending approximately 9 miles upstream from the New Mexico-Arizona State line. Data tabulated and presented include mean daily discharge, ground-water hydrographs, water quality, and sediment chemistry and particle-size distribution.