BLM Extention Letter - Laserfiche WebLink

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ii. Green Mountain Reservoir Supplies that are"Surplus"to the HUP supplies a. This amount varies depending on flow conditions (can summarize from annual HUP reports) iii. Williams Fork Reservoir a. 5412.5 AF temporary pool (for 10 years beginning in 2000) • Spring Peak Enhancement — to provide additional water up to approximately 20,000 AF/year for spring peak flow enhancement (10 day period) without impairing project yield or causing projects sponsors to incur significant costs. This occurs in all but extremely dry or wet years or generally when peak flows are between 12,900 cfs and 26,600 cfs in the 15-mile reach. i. Coordinated Reservoir Operations a. Operated in 1997 (+2000 cfs), 1998 (2400 cfs), 1999 (+2500 cfs) and in 2006. Coordinated Reservoir Operations have been impacted by drought conditions since 2000. ii. Coordinated Facilities Water Availability Study a. Feasibility investigation to examine additional alternatives to supply the 20,000 AF/year to enhance spring peak flows. II. Benefit to Stream Segments The operations associated with the Upper Colorado River Endangered Fish Recovery Program have produced positive benefits to the stream segments each year. Those benefits vary according to flow conditions in the basin, but historic contributions can be summarized in the hydrographs for the Colorado River at Dotsero and the Colorado River at Kremmling. III. Permanent Flow Protection The permanency of protection provided by the Program is linked to the continued operation of the Program and use of flow enhancement sources upstream of the reaches to be protected. IV. Pros and Cons Pros • The Program requirements to provide flow mitigation are presently in place and operating. • Program flows enhance both peak and low flow periods in the stream segments. • CWCB in-stream flows may provide a permanent protection, even if the Program fails, depending on the parameters of the water rights. Page 5 of 6