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<br />(usc;s) stream Kltge No. 06714000, near the 19th Street bridge 1n <br />Denver. VloodinR occurred throughout the South Platte River BaSln <br />with the net renuIt being six persons drowned, two other deaths <br />caused by flood-related sctivities, and damage esumated at $500 <br />m1llion of which $300 m1llion occurred in the Denver area (Refer- <br />ences 5-8). <br /> <br />Because of conscious efforts by Jefferson County in recent years, <br />commercial and residential flood plain development has been <br />severely restricted. However, some older developments, <br />particularly in the mountain valleys and foothill areas, have a <br />high potential for flooding problems. <br /> <br />2.4 Flood Protection Measures <br /> <br />There are numerous dams, reservoirs, and <br />within Jefferson County. Many of these flood <br />affec t flood peaks on the streams inc luded <br />add1tion to an active flood plain management <br />flood protection measures are listed below: <br /> <br />channel improvements <br />protection measures <br />in this study. In <br />program, the major <br /> <br />Bear Creek - Evergreen Lake, located just upstream of Evergreen, <br />is primarily used for water supply and recreation and provides <br />little routing effect to the flood peak. Mt. Carbon Dam and the <br />Bear Creek Lake were designed by the U.S. Army Corps of Engineers <br />(COE) for the purpose of flood control. Peak flows from the 100- <br />year event have been reduced from 30,000 cfs to approximately <br />1,000 cfs through atorage in the reservoir. However, because of <br />its location, there is little protection provided for other areas <br />1n Jefferson County. <br /> <br />Bear Creek Tributaries Number 1 and Number 3 - Storm sewers have <br />been constructed at various places along these streams. During a <br />flood event, these storm sewers will overtop, and damage caused by <br />the resultant flooding may be greater than before the storm sewers <br />were installed. <br /> <br />Bergen Creek Chsnnel improvements have <br />immediately downstream from State Highway 74. <br />provide significant protection to the adjacent <br />overtopped during extreme flood events. <br /> <br />been constructed <br />These improvements <br />buildings, but are <br /> <br />Buffalo Creek - Wellington Lake is located near the headwaters of <br />Buffalo Creek. This lake is used for water supply and recreation <br />and provides negligible flood protection. <br /> <br />Clear Creek - There are few flood protection measures for Clear <br />Creek that cover areas in Jefferson County. Some channelization <br />work has been done in and near Golden, but it has !lttle effect <br />during a flood peak. Additional channel improvements have been <br />constructed between Marshall Street and Wadsworth Boulevard. <br /> <br />Coon Creek - There are three on-stream reservoirs on Coon Creek <br />that help to reduce the flood peaks in their immed1ate vic1nity. <br />These are Grant A Lake, Beer Sisters Lake, and an unnamed <br />reservoir at the upstream study limit. <br /> <br />7 <br />