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<br />CONTENTS <br /> <br />2Si8 <br /> <br />Abstract----------------------------------------------------------------- <br />lntroduction------------------------------------------------------------- <br />Purpose and scope--------------------------------------------------- <br />Methods of investigation-------------------------------------------- <br />Description of drainage basin-------------------------------------------- <br />Description of Pueblo Reservoir------------------------------------------ <br />Water quality of the upper Arkansas River-------------------------------- <br />Water-quality characteristics of Pueblo Reservoir------------------------ <br />Onsite water-quality measurements----------------------------------- <br />Water temperature---------------------------------------------- <br />Specific conductance------------------------------------------- <br />Light transparency------------------------------------------___ <br />Dissolved oxygen----------------------------------------------- <br />pH------------------------------------------------------------- <br />Chemical constituents----------------------------------------------- <br />Nitrogen and phosphorus---------------------------------------- <br />Major chemical constituents------------------------------------ <br />Trace elements------------------------------------------------- <br />Biological constituents--------------------------------------------- <br />Phytoplankton-------------------------------------------------- <br />Zooplankton---------------------------------------------------- <br />Summary and conclusions-------------------------------------------------- <br />Selected references------------------------------------------------------ <br />Supplemental information related to potential contaminants to Pueblo <br />Reservoir-------------------------------------------------------------- <br /> <br />PLATE <br /> <br />Plate <br /> <br />1. Map showing location of potential sources of contaminants, <br />mine drainage tunnels, selected water-quality and <br />streamflow-monitoring stations, and subbasins---------In pocket <br /> <br />FIGURES <br /> <br />Figure 1. Map showing location of Pueblo Reservoir in relation to <br />the upper Arkansas River basin and location of sampling <br />sites on Pueblo Reservoir---------------------------------- 3 <br />Z. Graph showing minimum, mean, and maximum monthly streamflow <br />at station 07097000, Arkansas River at Portland------------ 7 <br />3. Graphs showing Pueblo Reservoir end-of-month contents and <br />annual mean streamflow at station 07097000, Arkansas River <br />at Portland, 1974 through 1985 water years----------------- 10 <br />4. Graph showing relation of retention time, outflow, and <br />reservoir storage------------------------------------------ 12 <br />5. Map showing streams affected by metal-mine drainage---------- 13 <br /> <br />iii <br /> <br />Page <br />1 <br />2 <br />4 <br />4 <br />5 <br />8 <br />11 <br />22 <br />22 <br />22 <br />24 <br />27 <br />30 <br />33 <br />33 <br />33 <br />36 <br />37 <br />37 <br />42 <br />46 <br />46 <br />49 <br /> <br />51 <br /> <br />Page <br />