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<br />~ <br /> <br /> <br />Jefferson Lake (Photo courtesy of Theresa Stone) <br /> <br />Wet and Dry Periods <br /> <br />Every year, Colorado experiences at least one 100-year flood <br />somewhere in the state. Colorado's total flood losses have <br />been documented to be $4.9 billion to date. The South Platte <br />Basin's most recent major flood event was July 28-29, 1997. <br />The estimated total historic flood damages for this basin are <br />$3.4 billion to date. <br /> <br />'_---.J---.J <br />Dry Avg Wet <br /> <br />Upper Basin <br />Lower Basin <br /> <br />~ <br /> <br />June & Sept 1933 <br />Castlewood Dam <br />fails <br /> <br />Iu <br />~ I~ <br /> <br />I <br /> <br />ro <br />~ <br /> <br />ro <br />ill <br />01 <br /> <br />ill <br />o <br />01 <br /> <br />ill <br />0J <br />o <br /> <br />ill <br />o <br /> <br />~ <br />01 <br /> <br />~ <br />o <br /> <br />ill <br />o <br />o <br /> <br />ill <br />U; <br /> <br />Sept 2-4, 1938 <br />Bear and Clear <br />Creeks flood <br /> <br />Source: Colorado Water Conservation Board <br /> <br />Major Imports into the Basin <br /> <br />Name Recipient Stream Diversions <br />(acre-feet) <br /> <br />1*Adams Tunnel <br />2 Moffat Tunnel <br />3 Roberts Tunnel <br />4 Grand River Ditch <br />5 Laramie-Poudre <br />Canal <br />6 Aurora Homestake <br />7 Michigan Ditch <br />8 Berthoud Pass Ditch <br />9 Wilson Supply Ditch <br /> <br />Big Thompson R. <br />South Platte R. <br />South Platte R. <br />Cache La Poudre R. <br />Cache La Poudre R. <br /> <br />231,060 <br />52,912 <br />68,767 <br />20,256 <br />16,104 <br /> <br />South Platte R. <br />Cache La Poudre R. <br />Clear Creek <br /> <br />Cache La Poudre R. <br /> <br />16,544 <br />4,410 <br />1,090 <br />1,673 <br /> <br />Major Exports from the Basin <br />None <br /> <br />* Numbers in the above table correspond to numbers that <br />accompany arrows on the basin map (p. 5). <br /> <br />t Continental Hoosier Tunnel exports from the Colorado <br />Basin to the Arkansas Basin through a portion of the South <br />Platte Basin. <br /> <br />Source: Division 1 1998 Annual Report, 10-year averages <br /> <br />Unique Characteristics <br />" <br />~ <br /> <br />Average imports into the South Platte Basin exceed <br />those in all other basins. <br />Reliance on Denver Basin non-tributary groundwater, <br />which has a limited life, for municipal and <br />industrial needs. <br />l\ Presence of threatened and endangered species <br />significantly affects water resources management and <br />development. <br /> <br />July-Aug 1976 <br />Big Thompson and <br />Cache la Poudre flood <br />June 1965 <br />Basin floods <br /> <br /> <br />p--- <br /> <br />July 1997 <br />Fort Collins, <br />Sterling flood <br />I <br />] <br />......1...... <br />ill ill <br />~ ~ <br /> <br />~ <br />01 <br /> <br />ill <br />01 <br />o <br /> <br />~ <br />o <br /> <br />~ <br />01 <br /> <br />~ 1 ~ <br />o 01 <br /> <br />ill <br />ill <br />o <br /> <br />ill <br />01 <br />01 <br /> <br />ill <br />OJ <br />o <br /> <br />ill <br />OJ <br />01 <br /> <br />May 5-6, 1973 <br />Basin floods <br /> <br />July 12, 1996 <br />Buffalo Creek <br />floods <br /> <br />July 15, 1982 <br />Dam Failure, <br />Roaring & Fall <br />Rivers flood <br /> <br />( South Platte River Basin Facts - 3 ) <br />