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<br />September 15, 2004 <br /> <br />Lower Arkansas River Basin <br />District 10 <br />Diversion Structure Inventory <br /> <br />3 Southern Colorado Power Company Intake <br /> <br />Narrative of Structure Components and Repair Plan <br /> <br />The Southern Colorado Power Company Intake structure consists of an approximately <br />200-foot-long Ogee dam/spillway, with a "bucket" at its toe. There is an 8-foot-wide <br />notch in the middle of the dam. The diversion is approximately 25-feet-wide. The <br />structure appears to convey cooling water underground through the BNSF/DNRG <br />railroad switching yard to the power plant. Swerdfeger Construction Company is in the <br />process of installing a sewer main along the south bank of the river. <br /> <br />The overall condition of the structure appears to be good. A 2-foot by 3-foot area of <br />damaged (spalled) concrete was found at the south end of the spillway. Additional <br />channel stabilization is needed downstream of the "bucket." <br /> <br />A thorough evaluation of the diversion structure's condition could not be made, since the <br />upstream water level was 3-inches below the top of its concrete deck at the time of <br />observation. It is therefore recommended that the diversion structure be re-evaluated in <br />a dry condition. In considering only what was visible, minor spalled/cracked concrete <br />repair is needed. Also, the timber debris fence upstream of the structure will eventually <br />have to be replaced, as well as the debris upstream of the gates removed. <br /> <br />Summary of Recommended Repairs <br /> <br />Dam/Spillway <br />o Repair damaged concrete (spalling) <br />o Install additional downstream channel stabilization <br /> <br />Diversion (portion visible at time of observation) <br />o Repair damaged concrete <br />o Replace timber debris fence <br />o Remove debris upstream of gates <br /> <br />Estimated Ranqe of Cost <br /> <br />Low: $0 - $250,000 <br /> <br />Farnsworth Group <br />