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<br /> <br />l~1~~~~k <br />~ -- <br /> <br />Graphs of the data from five of these gages were taken from the USGS Water <br />http://nwis-colo.cr.usgs.gov/ and are shown on the following pages for the years <br />Gage is too recent to have published data. (See Figures 1 through 4) <br /> <br />Page 6 <br /> <br />July 24, 2000 <br /> <br />Resources web site at <br />of operation. The Emma <br /> <br />RFR at Glenwood <br />Springs <br /> <br />1905 to <br />Present <br /> <br />19,000 cfs in <br />1957 <br /> <br />09085000 <br /> <br />09081000 <br /> <br />09075500 <br /> <br />09073400 <br /> <br />09073300 <br /> <br />76 <br /> <br />8,120 <br /> <br />1980-1986 <br /> <br />Active <br /> <br />Inactive <br /> <br />09072550 <br /> <br />Station <br />Number <br /> <br />There are only four active USGS gages located on the main stem of the Roaring Fork River. Three other <br />gages have existed in the past, but are no longer active, although records from those gages are useful. The <br />gages are listed in order from upstream to downstream. <br /> <br />3 <br /> <br />To understand the history of channel instability and its occurrence on the Roaring Fork, the history of <br />flooding was documented using USGS gage records. Flooding has occurred on the Roaring Fork River in <br />the years 1912, 1914, 1918, 1921, 1952, 1957, 1958, 1983, 1984, 1985 and 1995. Ruedi Reservoir dam <br />constructed in May 1968 on the Fryingpan River has significantly reduced the peak flood discharges on <br />the lower Roaring Fork River. The recent flooding in the spring 1995 was estimated as a one in fifty year <br />event in Aspen and a one in twenty-five year flood event further down valley. <br /> <br />This section of the report also <br />computed by the U.S. Army Corps <br /> <br />includes information concerning basin hydrology, including flood flows <br />of Engineers by analyzing the stream gage records <br /> <br />SECTION 3 <br /> <br />FLOOD HISTORY <br /> <br /> <br />ort <br /> <br />Town 0 <br /> <br /> <br />le & Pitkin Counties, Colorado <br /> <br />ort Town 0 le & Pitkin Counties, Colorado <br />- . <br /> <br />Figure 1 <br /> <br />Roar~ng Fork R~ver Rb Di~ficult C Nr Rspen, Co. <br />Stat~on Nu"ber: 09073300 <br />2000 <br /> <br /> <br />1750 <br /> <br /> <br />1500 ..-.- -.-.- <br /> <br /> <br />1250 <br />U'> <br />I.L. <br />u <br />.:1 1000 -- -- _ _. __ <br />.. <br />Ql <br />ll.O <br />'- <br />'" <br />'fi 750.0 <br />" <br />.ool <br />Cl <br /> <br />500.0 --- -..-. --- <br /> <br /> <br /> <br />250.0 <br /> <br /> <br />0.0 ' <br />1980 1982 1984 1986 1988 1990 1992 1994 1996 <br /> <br /> <br />Figure 2 <br />Roaring Fork R~ver Near Rspen, Co. <br />Station Nunber: 09073400 <br />2000 i.----' <br />i i I <br />I ,. <br />. . <br />1750 t... .......................i...l <br />I I <br /> <br />1500 L--.-- .-------........-.-----..---..1..---.---------.-1-------- _. ..._.... __ <br />I I I <br />I 'I <br />I I I <br />, I I <br />1250/"" ........ . ...--t+ "j"- .-... <br />U'>! I! <br />I.L. I I I <br />U I " <br />.: 1000 t .--- .-....-..-.-- .-..-........-..-.----.-j----...---.-... "- -+ ...----- .-.. ..--.- . .. <br /> <br />~: I I <br />-5 750.0 [_I "f '_1" <br />C4 l f <br />i:3 II! <br />I ,. <br />500.0 "-.--.--.---.... --..--.-.........- -j' -.-.-.- ...- ......i---..- '-.- -f'--" ..-.. . <br />\ i I <br />' I <br /> <br />250.0 j -11 ...... <br /> <br /> <br />0.0 I I i I +--r <br />1965 1975 1980 1985 1990 1995 <br /> <br /> <br /> <br />....-.~~...._....~...__.._- -.--.-....--..,..------........-.......--..-..-.-...-..---....-.-.......-.--.-...--...-..-....-.-.....--..- ... .....-...-..-.....--.-..-. . --..__._....._._~~....._-- ..."- <br />legend: ------ D~scharge, in CFS <br />------ Est~nated Discharge, ~n CFS <br /> <br /> <br /> <br /> <br />.~~~.. Page 7 July 24,2000 <br /> <br />RFR below <br />Aspen <br />RFR near Emma <br /> <br />1,451 <br /> <br />853 <br /> <br />09073500 <br /> <br />RFR above Lost <br />Creek <br />RFR above Difficult <br />Creek <br />RFR near Aspen <br /> <br />RFR <br /> <br />at <br /> <br />Aspen <br /> <br />108 <br /> <br />8,014 <br /> <br />1979 to <br />Present <br />1964 to <br />Present <br />1910-1921 <br />1932-1964 <br />1913-1918 <br /> <br />Inacti ve <br /> <br />Active <br /> <br /> <br />5,720 <br /> <br />6,470 <br /> <br />Inactive <br /> <br />1,800 cfs <br />1957 <br /> <br />2,230 cfs <br />1985 & <br /> <br />2,350 cfs in <br />1985 <br /> <br />Peak <br />Recorded <br />Discharge <br />(cfs) <br />1,900 cfs in <br />1985 <br /> <br />In <br />1995 <br />In <br /> <br /> <br />1997 to <br />Present <br /> <br />Active <br /> <br />Active <br /> <br />3,800 cfs in <br />1999 <br /> <br />5,000 cfs in <br />1918 <br /> <br />Man <br /> <br />Station Name <br /> <br />Drainage <br />Area <br />(sq. mi.) <br /> <br />TABLE 1 <br />USGS GAGING STATIONS <br /> <br />Gage <br />Elevation <br />(feet <br /> <br />MSL) <br /> <br />Period of <br />Record <br /> <br />Status <br /> <br />1 <br /> <br />GaE:e Records <br /> <br /> <br /> <br />