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<br />In some instances" flood borne del>riB s.nd mud blocked drainage <br />facilities. Also, overflow from :irriga.tion canals and d:itches <br />contributed to the flood problem ,dthin Denver. Highline <br />Canal, which originates at the South Platte Hiver south of <br />Kassler, Colorado, follows a meanilering course northeasterly <br />through major are.!'s of Denver and termInates along the east.ern <br />edge of the Rocky Mountain Arsenal j,n AdaJlls County. The cs.nal <br />and a number of slOaller drainage,s ~,used flood damage in <br />scattered locations. <br /> <br />e. Downstre!lnt from Denver, agricult.ural land,s sustained <br />damages from a combination of flooding, erosion, and sedimentation. <br />It is estimated that about 86,000 ac,res of land were floodE!d s,long <br />the South Platte l~iver in Colors.do. Stre.ambank erosion va.s <br />especially severe because of sust.~ined high flows after the <br />initial crest. Approximately 3 weeks after the rainstorm of <br />6-7 May, the South Platte River and some of its tributarie" <br />were running bankfull from snomnel t runoff. <br /> <br />1'.. Debris rp.moval efforts by local forces in Denver '~ere <br />instrumental in preventing damage to bridges crossing the Bouth <br />Platte River. The 15th Street Bridge co:Uapsed, however, 'ii!1en <br />its center pier failed because 'If erosion. Elsewhere, in outlying <br />areas, numerous bridges and culyerts were damaged or destroyed, <br />and many roads and highways wer'~ closed for perio,ls ranging <br />from days to weeks. <br /> <br />g. Flood outlines relativ,~ to this report are presented in <br />Volume 2. A map index for the flood outlines is on plat.e 28. <br />Outlines for the Bouth Platte River in Adams and Weld Counties, <br />Colorado, are presented on pla t,~s 29 through 58. A log of high <br />water marks for plates 29 through 5'{ is found in Volume 2. <br />Plates 59 through 100 cover the South PlattE! River from the <br />Weld-Morgan count:r line to Jules'burg plus Bijou Creek.. Plat.es <br />10;1. through 103 cover Westerly, Sand, and Toll Gate Creeks and <br />Lena Gulch. Plates 104 through 109 present high water data on <br />the Platte River and on its t'WO princ 1.pal tributaries, the' <br />South Platte and North Platte River". A general log of high <br />water marks, with descriptions of their locations, is presented <br />in table 23. The high water marks are for pertinent reaches of <br />the South Platte River in Colorado and Nebraska; for Sand, Toll <br />Gate, and Westerly Creeks and f'or Lens. Gulch, all in Colora,lo; <br />and for the North Platte and Sc'uth Platte R:iverll. <br /> <br />",9 <br />