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<br />OQ0374 <br /> <br />UPCO Final Report <br />Executive Summary <br /> <br />May 29, 2003 <br />Page vii <br /> <br />Colorado River below the Fraser River confluence: The water supply systems for the <br />Towns of Hot Sulphur Springs and Kremmling were adequate for existing demands but <br />would experience shortages under all of the future demand scenarios. In addition, <br />instream flows below Windy Gap were below CWCB, fish minimum, and kayak <br />minimum levels under all scenarios. Low flows in the Colorado River below Windy Gap <br />in the late summer and early fall often result in high water temperatures that adversely <br />impact the trout fishery. <br /> <br />Summit County <br /> <br />The P ACSM results were divided into the following sub-basins: <br /> <br />Blue River above Dillon Reservoir: Municipal and domestic water supplies were <br />adequate for existing and future water demand scenarios, but the Breckenridge Golf <br />Course would experience shortages under all demand scenarios in most years during the <br />spring and fall months. The potential for a collaborative arrangement involving in-basin <br />water providers, Summit County and the City of Colorado Springs to develop additional <br />storage in the Upper Blue River Basin emerges as a potential solution for further <br />evaluation in Phase III. <br /> <br />Tenmile Creek above Dillon Reservoir: Copper Mountain Water & Sanitation District <br />and the Copper Mountain Golf Course will experience frequent small water supply <br />shortages under existing demands and occasional large shortages under future demands. <br />Instream flows in Tenmile Creek below West Tenmile Creek were frequently below <br />CWCB levels and occasionally below wastewater treatment plant low-flow levels under <br />all demand scenarios. <br /> <br />Snake River above Dillon Reservoir: A-Basin and Keystone snowmaking, Keystone- <br />domestic uses below Peru Creek, Keystone Gulch and the East Dillon Water District will <br />experience water supply shortages under future demands. The water supply shortages in <br />the Snake River Basin are due primarily to lack of adequate physical supply during the <br />fall and winter months. At times, Keystone snowmaking shortages can be eliminated by <br />pumping water from Denver's Montezuma shaft into the Snake River. Due to Robert's <br />Tunnel maintenance and operational constraints, this water is not always available. An <br />additional issue relating to reduced stream flows concerns levels of zinc, cadmium and <br />copper in excess of aquatic life water quality standards and levels of manganese in excess <br />of the domestic water supply standards due to acid mine drainage from the Peru Creek <br />drainage. <br /> <br />Dillon Reservoir and the Blue River below Dillon: Under future demand conditions, <br />PACSM results indicate significant increases in the frequency and duration of periods <br />when Dillon reservoir would be below levels needed for normal operation of the Dillon <br />and Frisco marinas. Streamflows in the Blue River below Dillon Reservoir under future <br />demands would be at or above the 50 cfs CWCB in stream flow that was determined <br />using PHABSIM analysis, but frequently below the 55 cfs seasonal flow (10/1- 4/30) <br />identified by CDOW using the R-2 Cross Method. Streamflows in the Blue River below <br />Dillon Reservoir under future demands would also frequently be below the rafting low- <br />