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<br /> 'Table 1 Climatological Datal! <br /> Big Thompson River Bas i n Vi ci n I ty <br />. Mean Annual July Mean January Mean <br /> Location Preci p itation Temperature Temperature <br /> (inchesl (OFl (OFl <br />, <br /> Fort Colli ns 14.94 70.8 26.8 <br /> 2 mi les East- <br /> Southeast of <br /> Post Office In <br /> Longmont 12.74 71.6 26.8 <br /> Greeley 12.20 73.3 24.5 <br /> Estes Park 15.87 62.2 27.1 <br /> <br />l! This data was compiled from National Weather Service records <br />for 1941-1970. <br /> <br />., <br /> <br />The primary streams in the Big Thompson River basin are <br />the Big Thompson River and the Little Thompson River. The Big <br />Thompson River has its source in Rocky Mountain National Park near <br />Milner Pass. From this area the river flows In a general easterly <br />direction to its confluence ~ith the South Platte River about 5 <br />miles southwest of Greeley. The portion of the Big Thompson River <br />studied In this report begins about 2 miles southeast of Loveland <br />near the center of Section 20, T5N, R68W and ends about 5 miles <br />downstream at the Larimer-Weld County line between Section 24, <br />T5N, R6BW and Section 19, T5N, R67W. The upstream study limit of <br />this report is the downstream study limit of Flood Plain Informa- <br />tion. Blq Thompson River. Loveland, Colorado, published by the <br />Corps of Engineers in December 1971. Throughout this reach the <br />channel width varies from 80 to 160 feet and averages 100 feet In <br />width. The channel depth ranges from 4 to 9 feet and averages 6 <br />feet. The streambed has an average slope of 9.5 feet per mile <br />through the study reach. The channel is alluvial and meanders <br />through a "u"-shaped val ley scarred by considerable mining activity. <br /> <br />3 <br />