Precipitation-chemistry data at selected sites in northwestern Colorado, 1980-94

The chemical content of precipitation was monitored during the period 1980-94 at three sites at altitudes above 2,400 meters near the Piceance Basin in northwestern Colorado. Daily precipitation volumes, specific conductance, pH (in this report pH is expressed as hydrogen-ion concentration), concentrations of major cations and anions, calculated charge balance between cations and anions, and summary statistics of chemical concentrations are tabulated. Sampling sites are plotted on a map of the area. Seasonal variabilities of major cation and anion concentrations are presented graphically.