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• <br /> SI AIEOF COLORADO <br /> Mr. Irvin Johnson <br /> 8/9/2006 <br /> Page 2 <br /> use the inflatable bladder again. The outlet gate must be left fully open after the reservoir <br /> is drained this summer. After the runoff has peaked next spring,the gate may be closed <br /> (if the reservoir level is below the restriction)to store water to the restricted level. <br /> • The current storage restriction is an interim measure only,intended to relieve some of the <br /> load on the embankment until the dam can be rehabilitated. Should the planned work be <br /> delayed for any reason,the restriction will be re-evaluated,and a new restricted level will <br /> be set to maintain the long-term safety of the dam. <br /> Bull Creek#5 <br /> • The over-steepened portions of the downstream slope continue to erode,and are in <br /> danger of becoming unstable. As we have discussed before,your long-term plans should <br /> include slope stabilization work at this dam to avoid a future storage restriction. <br /> • The existing emergency spillway is not adequate to prevent this dam from failing due to <br /> failure of the upstream dams(Bull Creek#1 and Bull Creek#2). As we have discussed, <br /> enlargement of this spillway is the most practical way to avoid all the complications <br /> associated with upgrading the hazard classifications of the upstream dams. I have set a <br /> deadline of December 31,2007,for submittal of plans for an adequate spillway. If the <br /> Bull Creek#5 spillway is not enlarged,Bull Creek dams#1 and#2 will be formally <br /> evaluated and upgraded to the appropriate hazard classifications. <br /> Please do not hesitate to call if you have any questions. <br /> Sincerely, <br /> Garrett Jackson,P.E. <br /> Dam Safety Engineer <br /> cc: <br /> Mark Haynes,Dam Safety Branch Chief <br /> Alan Martellero,Division Engineer <br /> Tom Brigham,District 72 Water Commissioner <br /> Connie Clementson,USFS District Ranger <br /> Ron Luehring,USFS Regional Geotechnical Engineer <br /> Helen Steuben <br /> File <br />