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flow measurements obtained between 1989 and June 1994 for this location are <br />provided in Appendix A. Prior to that time, instability of the stream channel caused by a 1984 <br />flood precluded the installation of any type of monitoring station in the vicinity. The old <br />Stevens chart recorders were replaced with electronic streamflow recorders in Apri12003. <br />The bridge located immediately downstream of TR-a was replaced in the fall of 2001 <br />potentially altering the current stage rating curve. Therefore, the decision was made to update <br />the stage/discharge curves for TR-a and TR-b. Over the 2001 season, a total of nine cross- <br />sections and associated velocities were measured at each cross section location. This data was <br />used to compute a stage rating curve at each location. <br />The stage rating curve for TR-a was developed from flows ranging from 11 cfs to 145 <br />cfs. The curve equation and r2 for the curve are as follows: y = 44.469x3.zso6 where y =flow <br />in cfs and x =depth of flow; r2 = 0.98. Flows for July 2006 were below the I 1 cfs used to <br />develop the rating curve; therefore, this calculated flow may to be low. <br />The stage rating curve for TR-b was developed from flows ranging from 13 cfs to 144 <br />cfs. The curve equation and r2 for the curve are as follows: y = 65.049x2.43', where y =flow in <br />cfs and x =depth of flow; r2 = 0.99. Flows for July, August and September of 2006 were <br />below the 13 cfs used to develop the rating curve; therefore, these calculated flows may to be <br />]ow. This data appears to indicate a good correlation between the upstream and downstream <br />flows along Trout Creek. A channel cross-section was developed using survey results that <br />verifies streambed stability (Drawing 1). This cross-section is provided in Appendix A. <br />Irrigation ditch flow observations were made in April, May, June, July, August and <br />October of 2006. The TR-A site was observed with flow except for the months of April, <br />August and October of 2006. Flow observations are provided in tabular format in Appendix <br />A. <br />4 <br />