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<br />FLOOD SITUATION <br /> <br /> <br />SOURCES OF DATA AND RECORDS <br />Stream gagi~g records from the United States Geolo~ical <br />Survey stream 9a9"'s on th",SigThO/llJlsonRiverwereused in the <br />hydrologk an(llysis for this study. The gag6 locations (Ind per- <br />tinent data port(linlng to them are snown in table 2. <br /> <br />Table 2 <br />Stream Gaging Oata <br /> <br />Stream <br /> <br />(;aoe Locatlo~ <br /> <br />Approximate <br />Or(l 1 nllge Area <br />(sq. mi.) <br />'" <br /> <br />GlIQIMRecords <br /> <br />Big Thompson <br />River <br /> <br />At mouth 01 canyon, <br />500 feat upstream <br />from Handy Ditch <br />diversion dam and <br />6mlleseastol <br />Drake. <br /> <br />ContInuous stnce <br />1887 except lor <br />periods between <br />1892 to 1895, <br />1904 to 1926, <br />i933 to 1938, and <br />1949 to 1951. <br /> <br />Figure 7. <br /> <br /><Jig Thompson RiVer. Looking downstream at the <br />confluence of fhe alg Thompson River and the <br />South Platte River (downstream from reference <br />pointl62l. <br /> <br />SigThompson <br />River <br /> <br />On lelt bank 0.7 <br />mlleupstreamlrorn <br />hlghw"ybrldge,I.G <br />miles upstream from <br />mouth,end4mlles <br />w..st of La Sail... <br /> <br />828 <br /> <br />Continuous since <br />1914 except for a <br />period from 1915 <br />/01927. <br /> <br /> <br />InfonTldtlonon past Iloods"dsobtained from Corps of <br />Engineers llood records, Weld County, the U.S. Geological Survey, <br />the Colorado Water Conserv(ltlon Board, and locill newspapers. <br /> <br />Cross section data and topographic mappIng having a con- <br />too.lr 1 nT"rVil I nf ? f""t iln~ il sea I" of I Inch ",ouals 200 teat <br />were establiShed by photogr~mmetrlc methods from flights made in <br />June 1975. Th",sa dat(l ..ere furnished by Weld County in cooperation <br /> <br />figure 8. 81g Thomoson Rlvor. LookIng upstre(lm at the <br />confluonce at the Big Thompson River (rlghtl and <br />tneSoutnPlattoRlver(lef/) (downstre(lmfrOl" <br />rat CrAnCe point 162). <br /> <br />e <br /> <br />, <br />