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<br /> <br />. o..s\U....a.:'... ~ <br />~. <br />. -,~ ~'. '-. . <br /> <br />. <br /> <br />. <br /> <br />would amount to 3,100 acre-feet. The restoration of this 12-mile <br />reach of channel would be economically feasible with a benefit-cost <br />ratio of 2063 to L <br /> <br />Tributary Channel Restoration <br /> <br />Cone,jos River <br /> <br />The existing braided length of the Conejos River from the <br />Mogote gaging station to its confluence with>>the Rio Grande would be <br />modified from 4L3 miles to 3L5 miles. The river water surface would <br />only be reduced 154 acreso From the Mogote gaging station to U.S. <br />Highway 285 near Antonito, the channel would have a capacity of 2,000 <br />, <br />cubic feet per second, with a low-flow channel having a capacity of <br />500 cubic feet per secondo From UoSo Highway 285 to the Rio Grande, <br />channel capacity of 1,500 cubic feet per second would be provided. <br />The channel dimensions and a typical cross section are shown on plate 1. <br /> <br />Four diversion dams would be provided to serve the major <br />ditches. Two of these dams would be concrete structures having head- <br />works capacities of 500 and 200 cubic feet per second. The, other two <br />would be sheet pile diversion dams with headworks capacities of 100 <br />cubic feet per second. The smaller ditches would be supplied from the <br />riverside canals. other major structures would be four concrete high- <br />way bridgeso Minor structures would be the check structures, ditch <br />turnouts, and outlets to the river required for the riverside canals. <br />A maintenance road would be provided on top of one of the spoil:bank <br />levees throughout the length of the channeL Riprap protection would <br />be provided at structures and 'at major channel alinement changes. The <br />cost of restoring the Conejos River channel was estimated to be <br />$2,859,000. <br /> <br />San Antonio River <br /> <br />The San Antonio River would require channel restoration <br />from U.S. Highway 285 to its confluence with the Conejos River. The <br />existing length of the river is, 16 miles, and the restored channel <br />length would be 15 mileso The channel would have a capacity of 1,000 <br />cubic feet per second. Riverside canals, a 50-cubic-foot-per-second <br />capacity low-flow channel, and a maintenance road would be provided <br />throughout the reach 0 <br /> <br />A concrete highway bridge at State Highway 142 and a con- <br />crete county road bridge east of Antonito would be required. A sheet <br />pile diversion dam, with headworks capacity of 100 cubic feet per <br />second, near Antonito is included. Riprap protection would be pr9- <br />vided at major structures and major channel alinement changes. 'The <br />estimated cost for channel restoration on the San Antonio River is <br />$1,160,000. <br /> <br /> <br />4 <br /> <br />