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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I I <br />I <br />I- <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />SECTION VII <br />RAILWAY BRIDGE <br /> <br />The Colorado and Southern Railway bridge over Frijole Creek was <br /> <br />constructed in 1909, The bridge was a deck plate girder with an 80-foot <br /> <br /> <br />span. Figure 6 shows details of the structure. The average distance from <br /> <br />the bed of the Frijole Creek Channel to the bottom of the bridge girder was <br /> <br /> <br />20 feet. According to the Colorado and Southern Railway, the bridge had <br /> <br /> <br />never received damage due to flooding, <br /> <br />Based on hydraulic calculations, the capacity of the bridge over <br /> <br />Frijole Creek with the water level below the bottom of the girder was <br /> <br /> <br />16,000 cfs. This capacity is in excess of the estimated peak discharge <br /> <br />resulting from a 100-year storm of 11,800 cfs in the Frijole Creek basin <br /> <br /> <br />above the bridge. The 100-year storm is nationally recognized for major <br /> <br /> <br />drainage design, and is the standard met for construction of bridges on the <br /> <br /> <br />interstate highway system. <br /> <br />VII-l <br />