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CONTENTS Pllqe Prefllce.......................,............................... 1. Bllckgroundlnfo!'1l111tlon........................................ Settlement ............................................... Tt>eStrell,,"nd ItsVlllley................................ OavelopmentontheFloodPlllln........................... FlcodSltulltion............................................... SourcesofOlltllllndRecords.............................. Flood Season IInd Flood Chllrllcterfstlcs ................... Fllctors Affecting Flooding IInd Its Impact ........... ..... Obstructions to flcodflo...s .......................... Flood dll..age reduction measures Other fllctors IInd their Impllcts ..................... ..................... Ftood...llrnlnglln(!forecllstlng....................... Flood fIghting IInd emergency &VlIculltlon plllns ....... Mlltarilll storllgeonthefloodplllln................. PIISt Floods................................................... 5u"""ary of Hlstoriclll Floods ............ ............. .... Flood Records .. ... ..... ........... ...... ........ ...... ... Flood Description.. ...... ........ ....... ............... ... June 1921 ........................................... June 1923........................................... Septem~er i 938 ...................................... JuneI949........................................... AugustI9S1......................................... FutureFloods................................................. Frequency................................................ HllzardsofLIIl"geFloods.................................. Floodedllrellsandflooddll..ages..................... Obstructlonstofloodflows.......................... Velocities of flow.................................. Rllteofrisellnddurlltlonoffloodlng............... Glossary of Terms ............................................. I I 2 " " " 12 12 12 " " " " " " " " 19 19 20 hble 2 , , 5 6 7 8 Flqure 2~ 20 " " " " " 27 " " 29 2 , , 5 6 7 TABLES Paoe Big Thompson River 61151n Vicinity ClimlltolOglclI1 DfItll ............................... :; 5treamGlIglngDatll................................. II Annual Pellk Dlschllrges for the Big Thompson River NearOrllke........................................16 AnnuIII Peak Discharges for the Big Thompson River NearLaSalle..................................... 17 AnnUli I Pellk DISCharges for the Little Thompson RlverNellr8erthoud............................... " Sumrnllry of Pertinent Olschllrges for t~ 81g Thompson River Basin .............................. " Flood Plllln Reference Oatil, 81g Thompson River Lovelllnd to the Lllrl....r-~eld County Line, Colorlldo .......................................... " FlOOd Plllln Reference Dlltll, Little Thompson River Boulder and Lllrlmer Counties Near Berthoud, Colorlldo .......................................... 36 PHOTOGRAPHS PlIqe 8lgThomp5onRlver. Looking downstream from CountyRolld9l: (reterencepolnt I) ................ , Big TI\onlp50n River. Looklngdownstre"",trom U.S.Hlghwlly87(referencepolnt221............. <; 8ig Thompson River. lookIng upstrellm from County Rolld 35 (reference point 371 . ... ... ... ..... 6 81g Thompson River. LookIng upstream from the Lerllller-Weld County Line (reference poInt 50) ..... 6 LIttle Tnompson River. Looking upstrellm from COuntyRoad4Creferencepolnt59l................ 7 Little Thompson River. Looklngdownstrellmfrom County ROlld 4 Creference point 591 ................ 7 Little Thompson River. Looking upstr"",", from U.S.Hlghwlly287(raferancepqlnt69) ............ 8 "