Laserfiche WebLink
<br />August 4, 2004 <br /> <br />South Platte River Basin <br />District 64 <br />Diversion Structure Inventory <br /> <br />1 South Platte <br /> <br />Narrative of Structure Components and Repair Plan <br /> <br />The South Platte structure consists of a low-level dam that is approximately 200 feet- <br />long, regulator gates consisting of one 16-foot-wide Obermeyer Gate and one 6-foot- <br />wide steel radial gate, and a diversion consisting of one 16-foot-wide Obermeyer <br />headgate. Improvements were made to the regulator gates and diversion structure in <br />1996. A small concrete building at the south bank contains controls for operation of the <br />Obermeyer Gates. <br /> <br />The overall condition of the structure appears to be good. The low-level dam consists of <br />a wall that is approximately 4-feet-high and 16-inches-thick. This wall was poured in <br />front of the original structure prior to 1996, possibly in the 1970s or 1980s. The original <br />piers were extended approximately 2 feet upstream to tie into the newer wall, and now <br />act as counterforts. Intermediate piers also remain, but are not being used. A notch, <br />approximately 4-feet-long and 2-feet-high, is located at the bottom center of the dam. <br />This appears to be utilized for flushing sediment downstream. Portions of the original <br />structure also remain for approximately the north 30 feet of the dam. North of the <br />structure, there is a broken concrete and rubble dam that extends from the original north <br />endwall to the north bank of the river, aligned in a northwest-southeast direction. <br /> <br />The low-level dam could have been extended approximately 130 feet farther to the north <br />bank. Stabilization is needed downstream of the concrete apron of the dam. One of the <br />counterforts is missing. The north 80 feet upstream of the dam should be dredged. <br />Downstream of the regulator gates along the south bank, there is a 50-foot-long scoured <br />area that should be filled in and stabilized. <br /> <br />Summary of Recommended Repairs <br /> <br />Dam/Spillway <br />o Extend dam approximately 130 feet to north bank <br />o Install downstream channel stabilization <br />o Upstream dredging <br />o Fill in and stabilize scoured area along south bank <br /> <br />Estimated Ranae of Cost <br /> <br />Low: $0 - $250,000 <br /> <br />Farnsworth Group <br />