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1 <br />Reservoir Operating Studies <br />' In some model runs that represented the enlargement of Elkhead Reservoir, the 9,000 of <br />industrial pool at Stagecoach was assumed to be transferred to Elkhead for industrial purposes <br />' thus freeing 9,000 of in Stagecoach for other municipal and industrial use. This assumed <br />transfer was justified based on growth projections that showed increases in industrial water use <br />occurring primarily in the Craig area and increases in municipal water uses occurring primarily <br />1 in the Steamboat Springs area. <br />Steamboat Lake <br />Steamboat Lake is modeled as having two storage pools: a 5,000 of industrial pool that <br />serves as a backup water supply for the Hayden Station and an 18,068 of recreation pool. The <br />1 only demand that can access storage in Steamboat Lake is the Hayden Station. <br /> Under temporary contracts over the past few years, water releases up to 2,000 of per <br />' year have been made out of Steamboat Lake to benefit the endangered fish in the Yampa River. <br /> This water has been stored by inserting stop logs in the spillway of the dam and has been <br /> released only when there was water stored above the spillway crest. However, the final <br /> operating studies do not reflect this operation because necessary decree changes and formal <br /> arrangements between the U. S. Fish and Wildlife Service and the Colorado Division of Parks <br /> have not been finalized. <br /> <br /> Eikhead Reservoir <br />1 The existing Elkhead Reservoir is modeled as having two storage pools: a 8,310 of <br /> industrial pool accessible only by the Craig Station and a 1,668 of municipal pool accessible <br /> only by the City of Craig. The remaining 3,722 of of existing storage is dead storage. There <br /> are no minimum releases or winter drawdowns modeled at the existing Elkhead Reservoir. <br /> The enlarged Elkhead Reservoir is modeled as having three storage pools: a 1,668 of <br /> municipal pool accessible to the City of Craig, a 17,310 of industrial pool (8,310 original plus <br /> 9,000 transferred from Stagecoach) accessible only to the Craig Station, and a 22,200 of <br /> enlargement pool. In the final operations studies for the enlarged reservoir, the enlargement <br /> pool was used only for Yampa River mainstem instream flow enhancement. A minimum <br /> release of 10 cfs or inflow, whichever is less, is also represented for the enlarged Elkhead <br /> Reservoir. <br />' It is anticipated that some drawdown restrictions might be placed on the enlarged <br />Elkhead Reservoir to maintain summer recreation potential. While the model incorporates <br />options to simulate such restrictions, none were imposed in the final operating studies of the <br />' enlargement. A review of model results indicated that the recreational pool target levels were <br />met most of the time without imposition of these operational restrictions. <br /> <br /> <br /> _a <br />?