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<br />CONTENTS
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<br />Abstract"""""..""""""""",..""""".."..,"""",..""""""",.."""""",....",.."""",,..,..,..""""""",....,..""""""",..,..,.."""","".. 1
<br />Introduction"",,""""""" ,..".."""""..".."""""..""""""",.."""""..,....'""""".."..""""""", ,.. ,.., ,.. ,..""""" ,.., ,.."...."""", ...... 2
<br />Purpose and Scope"""""""".."""",.."..""""",..,....""""".. ,....""""" ,..""""""""..,..""""""",.."".."""",.."".."""", 4
<br />Descri ption of Study Area"".."""",.."..""""",..",..""""""""""""",..""""""",....,..""""".... ,..""""""",.. ......"""", 4
<br />Sample Collection and Measurements""""""".."""",...."""""", ,.... ,..""""""",....,.."""", ,..,.."""""""",..,.."""""" 5
<br />Acknow ledgments """""..'""""""".."""""",...."""",....,.."""""..,..,.."""""..",.."""""""..""""""",.., ,....'""""..".. 6
<br />Interpretation of Data Collected for this Study""""",..",..""".."..,.."""""",..,.."",""""..,..""""".."""""""""".."...."""", 6
<br />Summer 1999,..""""".., ,.."""""..""""""",.."""""",....""""", ,..,.."""",..".. ,.. ,..""""",....,..""""".." ,....".."""",...... 7
<br />Synoptic Sampling""".." ,.."""",.."".."""""""""""""".."""""", ,.. ,...."""""..",...."""""", ....,..""""""",...... 7
<br />Di uroal Measurements........................................................,.......... ,................................................................... 12
<br />Reconnaissance Measurements in Dinosaur National Monument ..,...,............................................................. 16
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<br />Winter 2000 Synoptic Sampling""""",..""""""..,.."""""..,....""""",.."..""""""", ,.. ,..""""",........"""",.."".... ,.."" 18
<br />Estimate of Maximum Potential Late-Afternoon pH in the Lower Yampa River Basin ..,..................,......................, 20
<br />Interpretation of Historical Data from Yarnpa River near Maybell....................................................................................... 25
<br />Trends in Dissolved Solids and Major lons..........................................................,..............................,......................, 26
<br />Trends in Thermodynamic Properties""""""",..""""",....""""", ,..,....""""""",..""""""" ,..""""""""""..,'....'"""" 29
<br />Causes of Historical Increase in Measured pH at Yampa River near Maybell........................,............................................, 32
<br />Summary,..""""""",..""""""",..""""""",.."""""",...."""",....,.."""""..,..,.."""""..",.."""""" "..""""""",.."...."""""",.. 35
<br />Refereuces Cited"""..",.."""""..""""""",.."""""",..""""",..""""""",.."""""""".... ,.."""",..,...."""""..",...., ,.."""""",.. 3 7
<br />Supplemental Information",..""""""".."".."""",.."""""..,....""""",..""""""""""..".."""""....,..""""" ,.., ,..", ,.."""""..,.. 39
<br />
<br />FIGURES
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<br />I, Map showing study area aud water-quality-sampling sites......,......,..................,..,........................................,.......... 3
<br />2-25, Graphs showing:
<br />2, Temporal distribution of measured pH values at Yampa River near Maybell..................,................................ 4
<br />3, Specific conductance at Yampa River and tributary sites, August 16-19, 1999.............................................., 8
<br />4, Concentrations of calcium and alkalinity at Yampa River and main tributary sites, August 16-19, 1999......, 9
<br />5, pH and other geochemical indicators at Yampa River and tributary sites, August 16-19, 1999....,................, 10
<br />6, Measured and simulated pH at Yampa River sites, August 16-19, 1999..................,......................................, 12
<br />7, Diurnal measurements at Yampa River above Elk River, August 23-24, 1999........,..........,.....................,...... 13
<br />8, Diurnal measurements at Yampa River below Craig, August 23-24, 1999..............,................................,...... 13
<br />9, Diurnal measurements at Yampa River near Maybell, August 23-24, 1999......,................,............................ 15
<br />10, Diurnal measurements at Yampa River at Deerlodge Park, August 25-26,1999................,............................ 15
<br />II, Diurnal measurements at Yampa River at mouth, August 25-26, 1999..............................,............................ 16
<br />12. Reconnaissance measurements on Yampa River in Dinosaur National Monument, August 30-
<br />
<br />September 3, 1999.."""",..""""""",..""""" ,..,.."""""".."..""""""",.." ,.."""""...."""""""", ,..,.. ,.."""",...... 1 7
<br />13, Specific conductance at Yampa River and tributary sites, March 13-16,2000............................................,.., 19
<br />14, pH and other geochemical indicators at Yampa River and tribntary sites, March 13-16,2000......................, 21
<br />15, Measured and simulated pH at Yampa River sites, March 13-16,2000........................,..,.............................., 22
<br />16, Simulated maximum potential pH for water-quality sites in the lower Yampa River Basin,
<br />August 16-19, 1999, and March 13-16, 2000 ..........,....................................,..,.............................................., 23
<br />17, Simulated maximum potential pH for water sample collected at the Yampa River at Deerlodge Park on
<br />August 18, 1999, at varying salinities ........,..............................................................,................................,...... 24
<br />18, Temporal distribution of measured pH and dissolved solids at Yampa River near Maybell, 1950-99............, 27
<br />19, Temporal distribution of concentrations of major cations at Yampa River near Maybell, 1950-99..........,...... 28
<br />20, Temporal distribution of concentrations of major anious at Yampa River near Maybell, 1950-99.................. 29
<br />21. Temporal distribution of dissolved carbon dioxide saturation factor at Yampa River near Maybell,
<br />
<br />1950-99 "",.."""""",...."""""" ,..""""",..""""""",..""""""",..','.."""""..",.."""""".. ,.."""",.. ......"""""...., 30
<br />22. Relation between measured pH and dissolved carbon dioxide saturation factor at Yampa River near
<br />
<br />Maybell, 1950-99""""""..""""""",.."""""..",..""""",..".."""", ,..",..",..""""".. ,....""""".... ,..,..,.."""",..,.., 30
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<br />CONTENTS iii
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