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<br />",.,'1 <br />-'-' <br />'_1, <br /> <br />c.u <br /> <br />,.-.9; <br /> <br />, ' <br /> <br />a <br />C) <br />r-'l <br />"'1 <br /> <br />published a Flood Blain Information Report on the Big Thompson <br />River in the area south of Loveland in 1971 (Ref. 11). Both <br />hydrologic and pertinent hydraulic data prepared as a part <br />of that study were utilized in this report (Ref. 1). <br /> <br />The U. S. Geological Survey and the Colorado Water <br />Conservation Board jointly published a Flood Information Report <br />of the Big Thompson River flood of July31 - August 1, 1976 <br />(Ref. 4). This report depicts the flooded areas in the 1976 <br />flood and also reports various computed flood discharges and <br />measured high water elevations. The flood plain outline shown <br />in this report is not to be interpreted to be the same as the <br />100-year flood plain outline delineated in Volume II of the <br />Special Flood Plain Information Report. <br /> <br />STUDY AREA DESCRIPTION <br /> <br />The Big Thompson River is a western tributary to the South <br />Platte River with the confluence near LaSalle, Colorado. The <br />river originates in the Rocky Mountains and the basin extends <br />to the Continental Divide at an elevation of 14,250 feet above <br />mean sea level on Long's Peak. From its headwaters in Rocky <br />Mountain National Park, the river passes through the towns of <br />Estes Park, Loveland and Millikan, Colorado. The Big Thompson <br />River Basin is bounded by the Cache LaPoudre River Basin on <br />the north and the Little Thompson and St. Vrain River Basins <br />on the south. Figure 1, Vicinity Map, shows the location of the <br />basin and general study area. <br /> <br />The Big Thompson River Basin is all mountainous terrain <br />above the river gaging station just above the mouth of the canyon <br />in "The Narrows". This portion of the basin varies in elevation <br /> <br />-4- <br />