FLOOD09478

• Designation Number: 82
• County: Weld
• Community: Unincorporated Weld County
• Stream Name: South Platte River
• Basin: South Platte
• Title: Special Flood Hazard Information Report - South Platte River, Volume I, Weld County, CO
• Date: 4/1/1977
• Designation Date: 11/1/1977
• Floodplain - Doc Type: Floodplain Report/Masterplan

dr~lnln9 the e~stern slope of the Rocky Mount~lnS.
dr~ln~ge ~r~s of the South Piette RIver et v~rlous
In iIIeld County.
The OIestern boundery of the b~sln Is fonned by the Contlnen-
t~1 ~ivide wIth $lev~tlons up to ebout 14,200 feet end the leramle
Renge with elev~tlons up to ebout 10,000 feet. At the southwestern
corner of the besln, the mounteln ~ree known es South Perk Is

Teble 2 gIves
locetlonswlth-

Teble2
South Piette River Stre~m G~ge O~t~ In
Weld County, Coloredo

Geqelocetlon

DrelneQeAroe
(squeremlles)

Period of Record

Henderson

4,71J

loc~t...d, This el'ge Is needy flet end hes en elevetlon of about
10,OOQ feet. It Is surrounded by mount~ln r~nges verylng In ele-
v~tlOf1 from 12,000 to 14,000 feet. The Tarr'Yell Mounhlns form
the northeast boundery of the South Perk ~ree. Elevetlons In the
pleins nBglon very from epproxlmetely 7,000 feet along the foot-
hills to epproxlmetely 4,500 feet et the eestenn Ooundery of Weld
County.

Fortlupton

5,010

M~y 1926 to present except
for 8 period between 22 June
1941 and 26A?rll 1942.
1929 throuoh 1957 except
for a period between 31 Mey
1934 end I June 1935, I June
1935 end 4 August 1936 and
22 June 1947 end 31 Mey
1948.
1902tothepresentexcept
for a period between 7 June
1921 and 13 Oocember 19'21,
II June 1923 and 7 June
1924, and 31 Mey 19J5 end 5
August 1936.
1926 through 1955 except
for e period betwMn 5 June
1928 and 16 August 1930, 24
June 1941 and 19 Mey 1944,
"nd26,o.,prII1948,,"dI6
June 1949.

Kersey

9,598

DevelopMent on the FlOOd Plein
The South Piette RIver flood plain In Weld County Is utilized
p~lma~lly fo~ agrlcultur~1 purposes. Except ~ the a~eas adJecent
to Incorporated communitIes such as Fort lupton, Wettanburg, Evans,
G~eeley, etc., existing flood plain development Is mostly farm-
steeds end ~ench buildIngs, Dense development petterns, however.
do exist wn...n In the proximity of, especl~fly, the larger incor-
po~eted areas along the ~Iver.

Sublette

12,170

,

Infonmetlon On past floods was obtained from Co~ps of Engi-
neerS ftood records. The photogreph base for the flooded ~reas
are aerlel photogr~phS taken during the flood period In May 1973
by tn... Coloredo W~ter Conse~atlon Board and the Corps of Engineers.
Cl"Osssoctlondatautltlzedlnthlsstudywassuoplle<lbythe
Corps of Englnoars, H!gh ...ater "",rk deta from the flood of ",,"v
1973 waS coordinated and obteln~d In part by the Colorado Water
Consorvatlon Bo~~d with supplementel ;nfor"",tlon by the Corps of
Enqin_rs, tha U. S. Coolvgical Survey, end the Bu~eau of Rf'cla""'-
tlon. U. S. Geological Survey 7.5 minute ouadranple maps with
10 foot contour Intervals were also used In the study.

Source of Dllteand Rocords
^ reletlvely large amount ot historic stream g~ge deta does
exist for tho South Piette River In Wold County. The U. S. Geo-
logical Survoy has operated, at one time or another, four South
PieTte River stl'9am gages In Weld County. Infonmetlon from these
qapes was used in thO hydroioglc ~nalysls conducted during this
study. Table 2 p~ovldes Information on these streem gages.

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