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<br />approximately 700-acre-feet of water raised t~ level of Trout <br />Lake, located approximately 1.5 miles downstream, nearly 2 feet <br />above the crest of the dam. This caused a failure of that dam <br />and the release of some 2000 acre-feet of water. A local news- <br />paper account estimated the crest of the flood down the river <br />as 20 to 45 feet above low water, depending on the width of the <br />channel. <br /> <br />The October 5, 1911, flood was caused by a continuous rain prior <br />to and associated with a large rainstorm on OCtober 4, 1911. <br />No stream gage records or high-water marks are available for the <br />1909 and 1911 floods at Naturita; therefore, estimates of their <br />recurrence intervals are unavailable. <br /> <br />The 1942 flood on San Miguel River resulted in the highest peak <br />discharge ever recorded on U.S. Geological Survey Gage No. 09175500, <br />in operation from 1917 to 1929 and from 1941 to present. <br /> <br />The April 1942 flood was caused by a heavy snowmelt and had a <br />peak discharge of 7100 cubic feet per second (cfs) as recorded <br />at the State Highway 97 stream gage (Reference 5). Based on the <br />results of the study, the 1942 flood has an estimated recurrence <br />interval of 20 years. <br /> <br />The photograph below shows the elevation of the 1942 flood and <br />the potential flooding on San Miguel River at Naturita. <br /> <br /> <br />Figure 2. Looking Upstream at the Downstream Face of the State Highway 97 <br />Bridge Over San Miguel River <br /> <br />5 <br />