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• FLOWS <br />The Williams Fork River flow data is collected by the U. S. Geologic Survey at one <br />continuous gaging station and one staff gage. The Williams Fork River continuous <br />gaging station (WF-2) is near the confluence with the Yampa River, downstream of the <br />#5 Mine discharge. The staff gage (WF-1) is located upstream of the mine discharge <br />points. The flow data far Station WF-2 for 1997 was provided by the USGS. Only the <br />data through September, 1997 was available. Data for Oct. -Dec. 1996 is included in <br />this report as well as this information was not available for inclusion with last years <br />AHR. A plot of daily mean flow versus time for the Williams Fork River for 1997 is <br />presented in Figure 22. For the Williams Fork River at Cyprus Empire Corporation, <br />flows measured by the USGS during calendar year 1996 showed a maximum mean <br />daily flow of 2290 cfs and a minimum mean daily flow of 38 cfs. Monthly minimum, <br />• maximum and mean flows are plotted for each month of record in Figure 23. The flows <br />in the Williams Fork River during 1997 appear to be above normal for the period of <br />record. These flows including comparison between upgradient, WF-1, and <br />downgradient, WF-2, measured to date, do not show any stream depletion impacts from <br />mine dewatering. <br />WATER QUALITY <br />Summaries of the water quality data are presented in Tables 27 through 30. A plot of <br />upstream and downstream dissolved solids measurements for the river is presented in <br />Figure 24. The data indicates that the surface water quality does not show any <br />. significant variation from expected values. The comparisons of data from the upstream <br />C-01-044 1997 AHR Page 10 <br />