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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />etc, and man-made obstructions such as bridges, buildings, and roadways. <br /> <br /> <br />These obstructions have the tendency of increasing flood elevations <br /> <br />upstream of the obstructions and velocities downstream of the,obstruc- <br /> <br /> <br />tion. In some instances, debris piled against a structure does present <br /> <br /> <br />a potential threat to the safety of the structure. During the fall of <br /> <br /> <br />1970 and summer of 1971, the U.S. Bureau of Reclamation, in cooperation <br /> <br /> <br />with the Army Corps of Engineers, completed a clearing and snag removal <br /> <br /> <br />program. This program was primarily confined to the area above the high <br /> <br /> <br />water level of Blue Mesa Reservoir and downstream of the study reach. <br /> <br /> <br />An earth levee was hurriedly constructed near the southeastern part of <br /> <br />the Dos Rios Island. <br /> <br />The construction of the Taylor Park Reservoir near Taylor Park <br /> <br /> <br />(completed in September 1937) has reduced peak flows of Taylor River at <br /> <br /> <br />A1mont streamflow measuring station and in turn reduced the peak flows <br /> <br /> <br />in the study reach. Approximately 28% of the decrease in flows (218 cfs) <br /> <br /> <br />of Taylor River at A1mont since 1938 can be attributed to the construc- <br /> <br /> <br />tion of Taylor Park Reservoir and the remainder to natural decrease in <br /> <br /> <br />runoff. Generally speaking, Taylor Park Reservoir cannot be depended <br /> <br /> <br />upon to reduce peak flows in the study reach, since its primary function <br /> <br />is to provide water supply for irrigation purposes. <br /> <br />13 <br />