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<br />.- 7 -- <br /> <br />Bridqe Analysis <br /> <br /> <br />State Highway 55 crosses the South Platte River in the vicinity of <br /> <br /> <br />Crook by the use of five bridges as previously shown on Figure 2. The <br /> <br /> <br />Colorado Highway Department has been measuring these bridges to deter- <br /> <br />mine the cross sectional area under each bridge sinc', as early as 1948. <br /> <br /> <br />The period of record for each bridge varies from 1948 to 1980 for bridges <br /> <br /> <br />B & C, 1962 to 1980 for bridges A & E, and 1968 to 1980 for bridge D. <br /> <br /> <br />Table 1 presents the change in the cross section under each bridge during <br /> <br />the period of record available. <br /> <br />River Channel Analysis <br /> <br />Staff members from the Division of Water Resources went to the study <br /> <br />area and surveyed a cross section of the flood plain along the alignment <br /> <br />of a previous cross section take,n by the Corps of Engineers in 1973. The <br /> <br />elevation of the river channel at the location shown on Figure 2 was <br /> <br />3732.. 3 in 1973. The survey conducted in September of 1980 determined <br /> <br />that the elevation of the river channel at the same location is now 3732.6. <br /> <br />A field reconnaissance was also conducted on the Division of Wildlife <br /> <br />.lands to evaluate the effect of the management practices on the South <br /> <br />Platte River's capacity to carry flood waters ,Ind to cause increased sedimen- <br /> <br />tation. <br /> <br />CONCLUSIONS <br /> <br />GROUND WATER <br /> <br />As can be seen from the d,Ha collected for the analysis, we were not <br /> <br />able to ascertain that there has been any lffi rked increase in ground water <br />