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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 />There are no stream gages on Coal Creek nor Rock Creek for deter~ <br /> <br />mining discharge measurements. However, the following floods have been <br /> <br /> <br />reported. The floods of 1876; 1891, June 3. 1921; and May 26, 1935, <br /> <br /> <br />were caused by rapid snowmelt in .the mountains and heavy general rains. <br /> <br /> <br />A flood occurred in June 1896 which was reported as the highest of <br /> <br /> <br />record in the part of the valley near Louisville. The flood of <br /> <br /> <br />September 2, 1938, was caused by cloudbursts in the mountains and <br /> <br /> <br />foothills, which resulted in a flood slightly higher than in 1935. <br /> <br /> <br />Using slope-area measurements, the Corps of Engineers esti~ated the <br /> <br /> <br />flood discharges on Coal Creek near Erie to be 13,200, 7,800, and <br /> <br /> <br />3,500 second-feet in 1876, 1921. and 1938. respectively. <br /> <br />The 1876 flood is the largest reported at, Erie and approximates the <br /> <br /> <br />100-year frequency occurrences as determined by the Soil Conservation <br /> <br /> <br />Service using synthetic methods for flood routing. The most recent <br /> <br /> <br />floods in the watershed occurred on June 9, 1949; May 9, 1957; and <br /> <br /> <br />May 1969. <br /> <br />The following are recorded accounts of flood damage on Coal Creek <br />and Rock Creek: <br /> <br />Sept. 2, 1938 <br /> <br />Parts of the residential area in Louisville were <br />under several inches of water. The business district <br />was not damaged. One person was killed in an auto- <br /> <br /> <br />mobile accident on the flooded highway east of <br /> <br /> <br />Louisville. The bridge at Empire Dr. and State <br /> <br />- 7 - <br />