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<br />GENER~l CONDITIONS <br /> <br />the streambed to levels above expected flooding. <br />80th streams are essentially inanaturalcondltion <br />exceptwhereconstrlct&dbybrldgecrossingsendwherernasonrychen- <br />nel ..ails have been constr~cted for sever" I hundred feet nwr the <br />upstream end of the Bear Creek study reach and upstream from the <br />State Highway B bridge on Mount Vernon Creek. <br />The following photographs 1)I~strate the characteristics <br />of both streams. <br /> <br />This section descrIbes the general Characteristics of the <br />two ~tre"ms with e"1phasl s on the st1J~Y r.....chAs as del I 'led. <br /> <br />StreamendValleyCheracterlstlcs <br />EloorCr"eklsa lelt bank tributary of th"South Platte <br />River, Jo!nlng that str..am at Sheridan In southorn metropolitan Denver. <br />The total Bear Creek draInage basln cont"lns 261 square ",lies of <br />"hlch 164 square miles "r.. upstr6llm of theMorrlson'lage. The basin <br />Is 26 mIles long with a maxlrnum width of 13mlles. Borderlngltto <br />the north and "est Is the Cle"r Cr..ek basin, to the south and west <br />the South PI",++e River basin. Baslnelevatlonsvaryfrcrnover 14,000 <br />feet",,,,,nswlevel (m.s.I.) In the mountains to eleuetlon 5295m.s.l. <br />naar the mouth of tha creak. The Bear Creek basIn Is outlined On <br />the Inside front cover of this report. <br />ThestudyreachonElearCreekextendsfrOl'l1alxlutO.7mlle <br />upstr"amoftheMorrlsonbuslnessdistrlc+toO.9mlledownstream. <br />The channel slope i1varages 98 feet per mile for the studyr""ch. The <br />bed of the stn.",m Is stre...n ...ith medium +0 large-sIzed l>Oulders. The <br />Bear Creek Channel varies from 4 to 7 feet in depth and BO to 120 feet <br />in "Idth. Thechdnnel ismode,."telyslnuous. Scruboakandoth",r <br />ueqet~t Ion covers the stream banks. The Bear Creek flood pill I n llver- <br />ages 500 feet wIde through the center 01 Morrison and varies from <br />120t0900feet"idewlthlnthestudvreach. <br />Mount Vernon Creek f lo...s Into Bear Croek from the fKIrth <br />near the center of Morrison. Thecreekdralns9.4squaromlles, and <br />slopes 157 feet throu9h fhe Imlle length of the study re<lch. As <br />with 00,,'- CrAek it Is moderately sinuous, with a great m",nv lxlulders <br /> <br />. <br /> <br /> <br />Bear Creek channel downstream from 50<:l~ LI'lkA Rnad. <br /> <br />" the channel ,", brush-couorod banks. ThechanMI mM~"r..~ fr"", <br />" '" 60fe<lt In...idth2lnd 6 to 8 '00' Indeoth. ;" narrow flood <br />plain Jverages '00 ..,..,t " width. Arllstlnct ,,~ olaln " ~, <br /> <br />/ll"avs evIdent since the hlllsldas often slope contlnuouslvufl fr 0"1 <br /> <br />, <br /> <br />, <br />