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<br />. ".' .' <br />".",..-.; <br /> <br /><::I <br /> <br />"":'--1 <br /> <br />I\j <br />00 <br />~ <br />C,.jl <br /> <br />Date of <br />Survey <br /> <br />TABLE 5 <br /> <br />CHANNEL CIIANGES AT AT&SF nAlLlvAY BRIDGE <br />PURGATOI RE RI VER NEAR LAS NHMAS, COLORADO <br /> <br />SEDHIENT RANGE 22 <br /> <br />Change in Cross-Sectional <br />Area Below Girder <br />Since Original Survey <br />(sq.-ft.) <br /> <br />Change Since <br />Original Survey <br />(percent) <br /> <br />January 1942 (Orig.) <br /> <br />December 1943 <br /> <br />Septemher 19<14 <br /> <br />December 1945 <br /> <br />April 1%1 <br /> <br />October 1953 <br /> <br />Aur,ust 1957 <br /> <br />~Iarch I96~ <br /> <br />October 1966 <br /> <br />,.Iarch 1972 <br /> <br />-10 <br /> <br />-35 <br /> <br />-32 <br /> <br />+63fl <br /> <br />-10 <br /> <br />-1,053 <br /> <br />-738 <br /> <br />-757 <br /> <br />-1,202 <br /> <br />-0.12 <br /> <br />-0.43 <br /> <br />-0.41 <br /> <br />+7.87 <br /> <br />-0.12 <br /> <br />-13.16 <br /> <br />-9.22 <br /> <br />-9.46 <br /> <br />-15.03 <br /> <br />NOTES: Original opening under bridge girder = 8,nOO sq. ft. <br />= Smaller opening denoting aggradation. <br />+ = Larger opening denoting degradation. <br />