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The Sand Creek gage missing data from 1950 through 1982 were filled using annual linear <br />regression with the Laramie River gage (the Laramie River gage is only complete through 1982). <br />The Sand Creek gage only contains historical winter data for the winters of 1968 - 1970. With <br />only three years of historical winter data, the monthly linear and monthly logarithmic regressions <br />did not provide reasonable winter flows for the 1950 - 1982 period and the correlation was better <br />with annual linear regression than with annual logarithmic regression. Regression between the <br />Sand Creek gage and other nearby gages produced negative flow values for the winter months of <br />1982 through 2002. Therefore, the Sand Creek gage historical monthly averages from 1968 <br />through 1971 were used to fill the winter months of 1982 through 2002. The filled results are <br />shown in Figure 8. <br />16,000 <br />14,000 <br />12,000 <br />w 10,000 <br />a~ <br />U <br />~ 8,000 <br />O <br />~ 6,000 <br />4, 000 <br />2, 000 <br />- O V 00 N (O O V 00 N (O O V 00 N <br />Lf) l!7 l!7 (O (O I~ ~ ~ W 00 ~ ~ ~ O <br />~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ O <br />Filled Data Historic Data <br />Figure 8: Sand Creek at Colorado-Wyoming State Line Filled Results <br />Task2.doc 24 of 30 <br />