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<br />. <br /> <br />. <br /> <br /> <br />miles end a contributing drainage area of about 29 square miles. A map <br />of the basin is sho~ on plate 2. <br /> <br />The basin topography ischaraetertzed byroll1nghllls and narrow <br />stream valleys. Elevations In the basin range from 4790 to 5930 feet <br />ahove mean sea level. Foasil Creek 8trea~ slopes range from abOut 8 to <br />25 teet per mile through moat of the study reaeh and incresse to 100 <br />feet per mile at the upstream end of the study reach. The three Fossil <br />Creek tributarIes slope about 35 to 40 feet per mile in thetr study <br />reaches. The Fossil Creek channel generally ranges from about 2 to 10 <br />feet deep and 40 to 150 feet in top width. The tributary Channels <br />typically range from 1 to 6 feet in depth and from 30 to 200 feet In <br />top width. Figures 1 through 15 On the following paget are photographa <br />which illu~trate channel conditions in the study reach. <br /> <br />..~_ _,.__~_ L ___ '-_H ~_ <br />.,,~ ~..~~~ '0 o"w....~". ." """.."...~, ....,... "'.."''''",''' "'".. m.... LU <br /> <br />Figure 1. Foeen Creek. About onemlle downstreSm from Fosdl <br />~reeK Keservolr, ~ooKlng upstream (reference pOlnt <br />255),October1979. <br /> <br />eoldwintersprevail. IntensethunderatorOlS,sometimesofeloudburat <br />intendty, Can occur dur:tngthe SU''"''H montha. At Fort Collina, <br />adjacent to the Fossil Creek baSin, the mean annual precipitation is <br />aboutl5inc.hea. '!emperatures range froma.""jI,of270 FinJanllary to <br />a mean of 7io F in July. Tbe major soil association is the Heldt- <br />Renohill-Kim. Others are the Nunn-Fort Collins-Ulm, Weld-Wiley, and <br />Otero-Nelson-Tassel. These are generally deep, well-drained, medium- <br />textured soils on topography that ranges from level to steep. Vegeta- <br />tion is predominantly grassland or irrigated cropland, with few trees. <br /> <br /> <br />The Fossil Creek watershed ia croased by Interstate 25, U.S. High- <br />wsy 287, and the Colorado and Southern and the Union Pacific railroads. <br />There are county roads On moat section lines. The basin 1s almost <br />entirely rural, with irrigation canals and farms. <br /> <br />. <br /> <br />. <br /> <br />Figure 2. Fossil Creek. At Hospital Road looking npstreaM <br />(reference point 196), October 1979. <br /> <br />5 <br /> <br />6 <br />