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West Elk Mine 2007 Annual Hydrology Report 5 <br />• Average monthly flows in Minnesota Creek near Paonia, CO (USGS 09134000) in WY 2007 <br />ranged from 4.12 cfs (August 2007) to 81.1 cfs (May 2007) (USGS, 2008a). In comparison, <br />historical monthly averages have ranged from 3.4 cfs (January) to 86.5 cfs (May) over the period of <br />record from 1937 through 1947 and 1986 through WY 2006 (USGS, 2008a). The mean annual <br />flow in Minnesota Creek near Paonia, CO in WY 2007 was 18.7 cfs corresponding to about 87 <br />percent of the historical mean annual flow (21.6 cfs) over the period of record through WY 2007 <br />(USGS, 2008b).. The peak flow in Minnesota Creek was 119 cfs on May 15, 2007 compared to the <br />maximum peak flow of 359 cfs in 1993 (USGS, 2008b). A summary of the average monthly <br />stream flow data for Minnesota Creek near Paonia, CO is graphically presented in Figure 7. <br />Figure 7. Stream Flow Data for Minnesota Creek near Paonia, CO (USGS 09134000) <br />• <br />Minnesota Creek <br />100 <br />80 - <br />60 t Average Flow WYs <br />0 1937-47,1986-2006 <br />E 40 - - Average Flow WY <br />2007 <br />Y <br />N 20 ._ ......... ........ <br />0 <br />-co 'V 0 <br />0 <br />? Oo F ?eQ <br />Adapted from USGS 2008a) <br />• <br />June 2008 <br />HydroGeo, Inc.