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Last modified
1/25/2010 7:15:07 PM
Creation date
10/5/2006 3:46:11 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
82
County
Weld
Community
Unincorporated Weld County
Stream Name
South Platte River
Basin
South Platte
Title
Special Flood Hazard Information Report - South Platte River, Volume III, Logan County - Sedgwick County, CO
Date
6/1/1977
Designation Date
11/1/1977
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />of this flood ~t ~rsay and ~t Salz~c w~s the largest ever recorded <br />~t those loc~tlons except for the flood of May 1973 ~nd the flood <br />of June 1965 respectively. <br />1935 - RaIns of cloudburst Intensity over the basIns of <br />the plains tributaries to the South Platte River east of Denver <br />occurred on 30-31 May following the wettest May In Colorado In 48 <br />years. It was reported that a "veritable wall of water" appeared on <br />Bljou Creek about 4mlles upstream from Its confluence wIth the South <br />Platte RIver. The flood crest reaChed Fort Morgan on 31 May and was <br />reported to be (0 feet above flood stage having a dISCharge of 84,300 <br />cubic feat per second. Although the flood crest attenuated rapIdly <br />dOllllstreom from Fort Morg~n, the floodwater reached the Union Pacific <br />R.oJ I I road gr~de near Crook, Colorado. <br />1938 Heavy ralntall during thO period from 30 August to <br />4 September over much ot the upper South Platte River basin c~used <br />flooding on many of the mountain streams tributary to the South <br />Platte River as wel I as the South Platte River Itself. Relatively <br />minor fiooding was reported on the So~th PI~tte River. <br />1942 - The tloo4 at Aprll-May on the South Platte River <br />was ca~sed by excessIve r~lnla II and snowmel t. The susta Ined high <br />flows crr~tcd conSiderable domago mainly due to erosIon. Some lev~ <br />failure occurred. Failing temperaTures In laTe AprIl turned The <br />r~lnfall to snow as well as subsIding the melt of the exISTing snow- <br />pack thus preventing more sarlous flooding. <br />1949 - Heavy rainfall over a melting snowpack caused <br />floodIng on The South PlaTTe River from mld-May to laTe June from <br />LiTtleton, Colorado TO North PlaTte, Nebraska. Conslder~ble damage <br />was incurred by homes, farm buildings. and croes along th~T reach <br />of The rIver. <br />1965 - Heavy to Torrential rainfall over large portions <br />of the South Platte River I>aslncrO(lted extensive flooding along the <br />$outh PI~He River. Heavy r~lnfall occurroo over !X>rTlons of the <br /> <br />, <br />I <br />I <br />I <br />I <br />l <br /> <br />northern sections of the South PlaTte River ~sln on The 14Th and <br />15th of June. As The STorm system moved southWllrd, TorrenTI~1 raln- <br />f~11 centered principally over The Plum Creek watershed on 16 June <br />and on the BiJou Creek watershed on 17 June. Storm rainfall of The <br />perIod extended over some 3,000 squ/lre mIles of The South PI~tTe <br />River basin. Including The PlumCreek,CherryCreek,and Sand and <br />Toll Gate Creek w~Tersheds In the Denver region, and the B1Jou Creek, <br />KloWll Creek, CommanChe Creek, Badger Creek, ~nd ~ver Creek w~ter- <br />Shoos to the east. Flooding occurred on the South Platte River from <br />Plum Creek downstream fu North Piette, Nebraska asa result of this <br />rainfall. <br /> <br />1969 - Heavy rains started on the afternoon of 4 May and <br />contInued WiTh only InTermiTtent breaks until 8 May. The storm <br />covered ~n area along ~nd near the eaSTern slopes of the mountains <br />and extended Into porTions of the high plains. The heavieST amounts <br />were centered 25 Illlles SOUThwest of Denver ~nd extended In a Mnd <br />along The foothills northw~rd to near Estes Park. The weaTher ST~Tion <br />at Morrison reported a tot~1 STorm ralnfa II of 11.27 Inches and a <br />maximum dally amount ot 5.77 Inches. General tloodlng resulted ~long <br />The South Platte River. <br />1973 - Snowmelt runoff 'r~ the lower ~unta!n a~oa of the <br />South Platte River Msln began aoout The middle Of AprIl. Rainf~II, <br />amountIng to as much as ~ Inches, whiCh was the major causative <br />faCTOr of The flooding In The SoUTh PlaTte River basin, began on <br />5 May. Sh~rp Increases In flow as a result of The rainfall runoff <br />were recorded aT all gaging STatIons ~Iong the SoUTh PlaTte River from <br />LlTtleTonTotheColorado-NebraskaS"'atellne. The rainfall runoff <br />w~s ~ugmented by mountain runoff WhiCh was also increaSing during <br />this perIod. The resulT was general flooding throughout the South <br />PlaTte River basIn; floo4lng was characterized by high, sharp <br />hydrogr~ph pooks from The ralnfa II runoff followed by a slow recession <br />because of the continuing mountain snowmelt runoff. Bankfull <br /> <br />, <br /> <br />10 <br />
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