1998-01-20_REVISION - M1977342 - Laserfiche WebLink

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• Exhibit G - Henderson Mine and Mill Permit Amendment WATER and WETLANDS Water The Henderson PC3 Conveyor site is located within the upper Williams Fork River drainage basin in the upper Colorado River drainage basin. The Williams Fork River flows in a northwesterly direction. The USGS has maintained several surface water monitoring stations in the general area surrounding the project area for approximately 30 years. Drainage areas from these stations range from 5.5 to 35 square miles. Average annual flow for the period of record ranges from approximately 10 to 39 cfs. The highest flows in this section of the Williams Fork river occur in late June to early July. The baseflow period begins in late August to early September and continues until the beginning of the snowmelt period in April. • Streamflow within the project site was continuously monitored at several locations during the 1970s and early 1980s. Three baseline stream flow monitoring sites were installed and operated by W.W. Wheeler Associates from 1968 through 1983. Ute Creek above Ute Creek Reservoir has a basin area of 1.43 square miles, and mean basin elevation of 9750 feet. Streamflow at this station was monitored from July 1976 through October 1983. Average annual flow at this station during the period of record was 6.75 cfs. Average monthly flows range from 0.13 cfs during December and January to 2.55 cfs during June. Data from this site were used to estimate flows for an unnamed tributary that flows adjacent to the proposed wetlands mitigation site. Complete wetland information is located in the U.S. Army Corps of Engineers (CoE) Individual 404 Permit and Permit Application. East Branch Ute Creek has a basin area of 3.97 square miles, and a mean basin elevation of 9400 feet. Streamflow at this station was monitored during the irrigation season from May 1968 through September 1973. Flows at this station ranged from 0.18 cfs in August 1969 to 17.6 cfs in May 1970. i