R.L. Moquino B.A. Hill L.K. Miller 1997 As part of the Rio Grande Valley National Water-Quality Assessment Program, samples were collected at 34 sites in the upper Rio Grande Basin in Colorado and New Mexico during June and September 1994. The focus of the sampling was on trace-element concentrations in the water column, suspended sediment, and bed material. Water-column samples were analyzed for major constituent, nutrient, dissolved organic carbon, and dissolved trace- element concentrations. Suspended-sediment samples were analyzed for suspended- sediment and total trace-element concentrations. Bed-material samples were analyzed for nutrient and total trace-element concentrations. Physical properties of the water column also were measured at each site. application/pdf 10.3133/ofr97644 en U.S. Geological Survey ; Branch of Information Services [distributor], Water-quality assessment of the Rio Grande Valley, Colorado, New Mexico, and Texas; water-quality data for water-column, suspended-sediment, and bed-material samples collected at selected surface-water sites in the upper Rio Grande Basin, June and September 1994 reports