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<br />Roaring Fork River
<br />Floodplain Information Report
<br />
<br />Town of Basalt, Eaf!.le & Pitkin Counties, Colorado
<br />
<br />Roaring Fork River
<br />Floodplain Information Report
<br />
<br />Town of Basalt, Eagle & Pitkin Counties, Colorado
<br />
<br />standard disk set in the southeast comer of Ihe abutment of a railroad bridge crossing Ihe Roaring Fork
<br />River. It is 250,0 feet west.northwest of Ihe center of the crossing of State Highway 82, 228,0 feet wesl-
<br />northwest of railroad milepost 385, 108,3 feet east of the center of Ihe bridge over Ihe Roaring Fork
<br />River, 6,07 feel south of the near rail, 1.3 feet north of Ihe southern edge of the abutment, 1.0 feet
<br />southwest of a witness post, 0,7 feet east of Ihe west edge of Ihe abutment, about 2,0 feet below the near
<br />rail and at Bridge 384A over the Roaring Fork River and the siding at Wingo,
<br />
<br />SECTION 3 - FLOOD HISTORY
<br />
<br />This section of the report also includes information concerning basin hydrology, including flood flows
<br />computed by the U,S, Army Corps of Engineers by analyzing Ihe stream gage records,
<br />
<br />4,
<br />
<br />NAME
<br />0158
<br />
<br />ORDER
<br />SECOND
<br />
<br />ELEVATION
<br />6,640,81
<br />
<br />To understand the history of channel instability and its occurrence on Ihe Roaring Fork, the hislory of
<br />flooding was documenled 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 />construcled 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 roughly estimated as a one in
<br />fifty year event in Aspen and a one in twenly-five year flood event further down valley,
<br />
<br />DESCRIPTION:
<br />A standard disk, stamped G 158 1934 and set in the lop of a concrete post It is located 7,6 miles
<br />soulheast from Carbondale, in Eagle County, 7,6 miles southeast along the Denver & Rio Grande Western
<br />Railroad from the stalion at Carbondale, Garfield County, 190 feet soulheast of the cenler of a road
<br />crossing, 45 feet eaSI of a residential home, 30 feet southwest of the centerline of the track, 6 feet
<br />northwest of an east fence comer, and 3,5 feet northeast of the fence,
<br />
<br />3.1 Gal!e Records
<br />
<br />There are only four aClive USGS gages located on the main stem of Ihe 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 />Station Station Name Drainage Gage Period of Status Peak
<br />Number Area Elevation Record Recorded
<br /> (sq. mi,) (feet MSL) Discharge
<br /> (cfSL
<br />09072550 RFR above Lost Man 1980-1986 Inactive 1,900 cfs in
<br /> Creek 1985
<br />09073300 RFR above Difficu]t 76 8,120 1979 to Active 2,350 cfs in
<br /> Creek Present 1985
<br />09073400 RFR near Aspen 108 8,014 1964 to Active 2,230 cfs in
<br /> Present 1985 & 1995
<br />09073500 RFR at Aspen 1910-1921 Inactive 1,800 cfs in
<br /> 1932-1964 1957
<br />09075500 RFR below 1913-1918 Inacti ve 5,000 cfs in
<br /> Aspen 1918
<br />09081000 RFR near Emma 853 6,470 1997 to Active 3,800 cfs in
<br /> Present 1999
<br />09085000 RFR at Glenwood 1,451 5,720 1905 to Active 19,000 cfs in
<br /> Sprinl!S Present 1957
<br />
<br />TABLE 1
<br />USGS GAGING STATIONS
<br />
<br />Graphs of the data from five of these gages were taken from the USGS Water Resources web site at
<br />http://nwis-colo.cr,usgs,gov/ and are shown on the following pages for the years of operation, The Emma
<br />Gage is too recent 10 have published data, (See Figures 1 Ihrough 4)
<br />
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<br />Page 6
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<br />November 14, 2001
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<br />Page 7
<br />
<br />November 14,2001
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