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23. Temporal distribution of measured and simulated pH at Yampa River near Maybell, 1950-99 ...................... 31 24. Temporal distribution of concentrations of nitrate at Yampa River near Maybell, 1950-94 ............................ 33 25. Temporal distribution of difference between onsite and measured laboratory pH at Yampa River near Maybell, 1980-99 ............................................................................................................................................. 34 TABLES 1. River miles of sites sampled for this study ............................................................................................................. 7 2. Summary of Wilcoxon-Mann-Whitney rank-sum tests comparing flow-adjusted physical measurements, constituent concentrations, and thermodynamic properties of water samples collected from Yampa River near Maybell during 1950-74 with those measurements, concentrations, and properties collected during 1975-99.... 26 3. Onsite measurements and concentrations of major and minor water-quality constituents in samples collected from Yampa River and tributary sites, August 1999 and March 2000 .................................................................... 40 CONVERSION FACTORS, VERTICAL DATUM, AND ABBREVIATIONS Multiply By To obtain Length inch 2.54 centimeter foot (ft) 0.3048 meter mile 1.609 kilometer Area square mile 2.590 square kilometer Volume acre-foot (acre-ft) 1,233 cubic meter Flow cubic foot per second (ft3/s) 0.02832 cubic meter per second Mass ton per day (ton/d) 0.9072 metric ton per day Pressure atmosphere, standard (atm) 101.3 kilopascal Temperature in degrees Celsius (° C) may be converted to degrees Fahrenheit (° F) as follows: Sea level: In this report "sea level" refers to the National Geodetic Vertical Datum of 1929-a geodetic datum derived frop~ a general adjustment of the first-order level nets of the United States and Canada, formerly called Sea Level Datum of 1929. Altitude, as used in this report, refers to distance above or below sea level. ADDITIONAL ABBREVIATIONS. µg/L micrograms per liter µmol/L micromoles per liter µS/cm microsiemens per centimeter at 25 degrees Celsius mg/L milligrams per liter iv CONTENTS