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Libby Operations – 2010 The Highlights

Libby Operations – 2010 The Highlights. The May WSF for 2010 was 4/887 KAF which is triggers a Tier 2 year per of the FWS BiOp. Sets the following requirements: 7,000 cfs Tiered Minimum Bull Trout Flow until Aug 31 Sturgeon Volume of 800 KAF

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Libby Operations – 2010 The Highlights

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  1. Libby Operations – 2010 The Highlights • The May WSF for 2010 was 4/887 KAF which is triggers a Tier 2 year per of the FWS BiOp. Sets the following requirements: • 7,000 cfs Tiered Minimum Bull Trout Flow until Aug 31 • Sturgeon Volume of 800 KAF • Sturgeon Operation required a spill of 10 kcfs above powerhouse for 7 days • The actual inflow volume for April – August was 4520 KAF which is 77% of average (based on the 1975-2009 inflow). • Deviation Request to store and release 260 KAF of storage. • Sept 30th target was elevation 2439 ft because The Dalles forecast was less than the 20th percentile (71.8 MAF)

  2. Libby Operations – 2010Summary • Libby Dam maximum refill elevation was 2442.9 ft (~16 ft from full) • 4520 KAF Apr-Aug Inflow Volume was within the 4887 KAF May forecast Standard Error. • Through the deviation request to store 260 KAF the sturgeon operation was able to guarantee both FWS BiOp objective to spill and provide for a flow neutral operation on the Columbia River main stem. • The forecast remained high throughout the year because of high precipitation in Oct-Dec.

  3. Libby Operations – 2010Summary cont’d • High rain event in late September caused Libby Dam to be higher than the 2439 ft end of month target. The operation was coordinated through TMT. As noted in the Daily Inter Lake article on Sept 23, 2010: • “Rains confound dam plan”

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