Laserfiche WebLink
<br />002144 <br /> <br />[ <br /> <br />However, due to very limited head avai lable ,on the <br />upstream side, a major (100 foot span) structure would be <br />required to improve conveyance. A minor structure, ,such as <br />a metal or concrete box culvert, would be ineffective. <br /> <br />Cost Estimates: <br /> <br />To clean the existing bridge openings <br />and remove willows <br /> <br />!? 10,000 <br />$500,000 <br /> <br />To construct major conveyance structure <br /> <br />rating <br /> <br />RecollUnendation: <br />5-b.J1e-- <br />The~Kighway ~epartment should be requested <br />curve for the U.S. Highway 285 bridge. <br /> <br />to furnish a <br /> <br />--------- <br /> <br />The mud and debris which has accumulated under the <br />bridge should be removed to increase its conveyance capacity. <br />consideration should be given to removing willows in the <br />channel for a distance of 500 feet upstream and 500 feet <br />downstream of the bridge. <br /> <br />An inflow outflow analysis should be made ',by the <br />Highway department to determine what additional conveyance, if <br />any, is retjuired to establish a balance between maintaining <br />valley storage and improving flow. <br /> <br />56 <br />