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• <br />The North Platte evaporation data were used to calculate the CL values on the South Platte <br />River. All tables used in the calculations can be found in Appendix A. <br />Gage Location /Data Reliability <br />The accuracy of the Roscoe Gage has come into question. The gage was first developed in 1982 <br />and maintained by the Nebraska Department of Water Resources until 1994. The USGS <br />currently maintains the gage. An additional bridge was constructed 50' upstream of the current <br />gage location in 1992 and in addition to the sever angle of the river to the bridge, may be causing <br />scouring at the gage location during high flows. Also, the gage is located on a large bend in the <br />South Platte River (see 1992 aerial photo below). <br />Daily mass - balance calculations on the South Platte River were completed in an effort to identify <br />the potential impact of gage problems on tracking natural flow, storage and /or environmental <br />account water. Important dates in this analysis are 1992, when an additional bridge was <br />constructed 50 feet upstream of the existing bridge, and 1994, when the USGS began to <br />administer this gage. <br />The object of the analysis was to determine whether or not a gain or loss in the Julesburg to <br />• Roscoe reach would be reversed to an approximately equal loss or gain the next day in the <br />