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<br />- .:- <br /> <br />~ <br /> <br />Development in tne Flood Plain <br />The pOpulation of Lo~gmont has more than dou~led during the <br />years 19~0 to 1970. During this time there has also been an increase <br />in residential construction In the rural areas upstream and downstream <br />oftheci1"y. Table 2 lists PQPulations for tile general area of the <br />study reach according to Census 8ureau figures. <br /> <br /> <br />r <br />I <br /> <br />Table 2 <br />POPULATION TRENDS <br /> <br />Year <br /> <br />Figure 6. St. VrainCreek w View downstr""m at 119thStreet. <br /> <br />1940 <br />1950 <br />1960 <br />1970 <br /> <br />Longmant <br />7,406 <br />8,099 <br />11,489 <br />23,209 <br /> <br />Boulder County <br />37,438 <br />48,296 <br />74,254 <br />131,889 <br /> <br /> Table I <br /> TYPICAL PHYSICAL DIMENSIOYS* <br /> ST. VR~,IN CREEK <br />locatIon !'"lcoG Plain C~nnol Channel <br />by Refer-once Width, "Idth, Depth, 51000 <br /> Point Feet Feet Feet r",et Per l'<lle <br />UIS Limit to Pt. 37 3,700 zen < 3D <br />~ <br />e., 37 '" e., " 4,500 300 , " <br />Pt. " '" e., " 3,700 Z80 6 2B <br />p" " '" e., % 3,300 200 8 " <br />e., 30 '" e., 61 3,300 200 , 12 <br />e., " '" e., 60 3,500 290 9 16 <br />Pt. 69 ro OIS " ,~ 2,400 320 5 IS <br />~./;1, . <br />* Those dimensions ar-" ap;>r-ox''!l<lt" aVP'-ag"s loe top reache~ described. <br /> <br />Except for Left Hand Creek, that angles UP fram the south- <br />west 1"0 join St. Yraln Cr~k near the east side of Longmant, there <br />are no ohysicai ~arrlers to exoansion oT the City to the north or <br />south. MUCh flood plain infringement already exists at longmont. <br />8etween Hover Road and theColoradOllnd Southernrallrood bridge on <br />the right bank are II n\!/llber Of gravel pi1"S Intennixoo with c()f'lYll~wcial <br />and residentla I bui Idings. Just upstream from 1"he ~r lege is a large <br />mobile home park. Downstream from the brid~e the right bank flood <br />plain Is less than 50 Dercent developed, with Industry, mobile homes <br />and other dwellings. T~ left bankllood plain frOfll Hover Road to <br />Sunset S1"reet contains only a few commerCial ~uildlngs at the down- <br />stream end. There is some residential and commercial development on <br />the latt bank betwoen Sunsat and Emery stroets, while downstream from <br />Emery Stroot, in the area betw.."n the8urlington Nodhern tracks and <br />St. VrainCreek,thefloodplaln is largalyundeveloped. A notable <br />oxceptlon Is another iarge mobile homo park just upstream trom Main <br />Street. Municipal sawage treatment tacilities are locat"d On the <br />left b~nk ",~r th~ east edge of 1"he city. <br /> <br />, <br /> <br />, <br />