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<br />. <br /> <br />, <br /> <br />e <br /> <br />, . <br /> <br />STATE OF COLORI\DO <br /> <br />- <br /> <br />Colorado Water Conservation Board <br />Department of Natural Resources <br />721 Centennial Building <br />1 313 Sherman Street <br />Denver, Colorado 80203 <br />Phone: (3031 866-3441 <br />FAX: (303) 866-4474 <br /> <br />Roy Romer <br />Governor <br /> <br />MEMORANDUM <br /> <br />J<lmes s. lochhe.ld <br />Executive Direaor. DNR <br /> <br />OariesC. Lile. P.E. <br />Director, (WeB <br /> <br />TO: <br /> <br />Jim Lochhead <br />Chuck Lile <br />Jennifer Gimbel <br /> <br />Gene Jencsok ~ ~ . <br /> <br />February 19, 1998 <br /> <br />FROM: <br /> <br />DATE: <br /> <br />SUBJECT: <br /> <br />Glen Canyon Dam Spillway Extensions <br /> <br />The Final EIS and Record of Decision on the Operation of Glen Canyon Dam recommended the <br />installation of spillway gate extensions to provide additional space behind Glen Canyon Dam and <br />thereby reduce the frequency of large flood control releases from Glen Canyon Dam. <br /> <br />Based on the knowledge gained as a result of the April 1996 Beach Habitat Building Flow <br />(BHBF) and other studies, the scientific community and Reclamation believe that flows at and <br />above 45,000 cfs will be beneficial to the natural resources below Glen Canyon Dam. <br />Consequently Reclamation believes that additional flood control space behind Glen Canyon Dam <br />is not needed and they recommend that the spillway gate extensions not be installed. This <br />recommendation is also based to a lesser extent on the cost of NEP A compliance actions <br />required before the gate extensions could be installed. Reclamation estimates that NEPA <br />compliance would cost $2.5-3.0 M, most of which would be spent on cultural resources <br />inventory . <br /> <br />Reclamation prepared the attached analysis for review and comment by the Technical Work <br />Group (TWG). If the TWG supports Reclamations recommendation it would be passed on to <br />the Adaptive Management Work Group (AMWG). The AMWG would be asked to recommend <br />to the Secretary of Interior that the spillway gate extensions not be installed. <br /> <br />Please review Reclamations analysis and I will contact you next week for your thoughts and <br />comments. We may want to schedule a meeting to discuss this issue after your review. <br /> <br />Attachment <br /> <br />cc: <br /> <br />Peter Evans <br />Randy Seaholm../' <br />