The samples were obtained in 3 field seasons: 1993-94, 1994-95, and 1996-97. Water samples were taken from stream channels or other proglacial sources. Many are grab samples, taken for characterizing the general signal of a particular stream. Some are samples taken as a suite of samples along a stream path, with times noted, and distance along the stream noted. The samples were analyzed by Bruce Vaughn at the Stable Isotope Lab at INSTAAR (Institute of Arctic and Alpine Research), University of Colorado. For the samples obtained during the 1993-94 year, a duplicate set was analyzed by Tyler Coplen at the US Geological Survey, in Reston, Virginia. For the analysis of hydrogen isotopes, the uranium reduction method was used at INSTAAR, and the platinum-catalyst equilibration method was used at the USGS. For oxygen isotopes, the standard CO2/H2O equilibration method was used at both labs. There was agreement between the analyses done at the two labs.