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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />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 />U. S. Highway 160 bridge crossing on Frijole Creek, approximately one <br />mile upstream of the confluence of Frijole Creek and the Purgatoire <br />River as shown on Plate 1. The area tributary to Frijole Creek above <br />this gage is approximately 80 square miles. <br /> <br />The largest flood at the station for the period of record between <br /> <br />1958 and 1968 occurred on June 17, 1965; the maximum discharge for this <br /> <br /> <br />flood was 10,600 cfs as determined using the USGS contracted-opening <br /> <br /> <br />method (14). An even larger flood occurred on June 22, 1954, with a <br /> <br /> <br />peak discharge of 13,500 cfs computed by the USGS based on observed <br /> <br /> <br />flood data and the contracted opening methods. The USGS made a determi- <br /> <br /> <br />nation of the peak flow at this same point for the flood of July 3, <br /> <br /> <br />1981, using observed flood data and the contracted-opening method of <br /> <br /> <br />discharge measurement. Based on these computations, the peak discharge <br /> <br />during the flood was 28,400 cfs, or a unit discharge of 355 cfs per <br /> <br /> <br />square mile, Table I is a summary of maximum annual discharges at the <br /> <br />Frijole Creek gage for the period of record; the table also includes <br /> <br /> <br />data for the 1954 and 1981 floods. No determination of the peak dis- <br /> <br /> <br />charge upstream at the Colorado and Southern Railway bridge was made by <br /> <br />the USGS for any of the floods described above. <br /> <br />VI-2 <br />