WSP01375

• File Number: 8443
• Description: Narrows Unit
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 1/1/1947
• Author: unknown
• Title: Narrows Unit South Platte Division Missouri River Basin Project
• Water Supply Pro - Doc Type: Project Overview

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spilhl2Y design flood could be converted to other uses by i.nstaUation
of ~uxiliary spillway capacity.

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ThE Narrows SitE was found to be thE most Economical si te
availablE. 1 t 8110HS the creetion of the grE" tES t bEnefits fro,n dl
nspEcts; it is thE best plan from nn Engineering standpoint in the t
SLEpa[" problems nre less than nt other sites; it has grE.'lter flcxi-
bili ty to accommodate changing conditions; end it is mDKes pos3ibL tbb
best use of the water nvail~ble.

Plan of Develop,nent.--1he major feature in the pl&n of development
",ill be the Narrows :.la,,, on the .::'outh t'll,"ttc River. The chunnel of
Bijou Creek Hill bs changed to direct the flow into the reservoir so
co,nplete regulc.tion can be given to 211 floods Hhich ,niCht occur on
thnt stru:"ll. The Union P&cific R"ilrond, z,tc:te Highwe.y 14h, county
rands, power lines, telephone lines, ano ot.her ut.ilitiES Hill be reloc-
atEd so SErvice can bs maint&inEd.

The dEun and dike across Bi jOll Creek will hOve a totol crest length
of 34,000 feet end " hEi~ht "bove foundation of 147 feEt nnd will con-
tain epproximatioly 16,300,000 cubic yards of Illatcrial. Rivtr outle ts
end spillHay Hill b8 cons true tcd on the north sidE of the river. "
scp"rrcCc outlet Hill be provided to maintnin service cO the Fort ,iorgc.n
CanGl.

The ini tiell cllocation of the USt of visual spece iJ< the prop'"'sld
r~sLrvoir is es follows:

5upcrstor&ge .. .. . . . . .
Flood control. . . . . . . . . . .
Joint use (flOOd and conservation)
Conservation . . .. . . . .
Deed storage (controlled by hio~d required
nt Fort f.lorgan CnnD~ outlt t)

318,000
250,000
75,000
323,000

ElCI'E.-flc t.
II II
II II
" II

_52,000 11

11

Tot.~l. . . . . . . . . . . . .

1,518,000 acre-flet

Th", inviolate flood control SPo.c'_ of 250,000 "Cl'c-fect end the
75,000 acre-feet of joint-use space h"ve beell 8(;reed UpOl> by the
Corps of Jongineers as being the cape.ci ty requir~d to control floods of
rrccord on thE Sout.h Platte River. This sp2ce Hill also be sufficient
to control Bijou Creek floods. The joint-use pool is to be ope rctLd
jointly for flood control end conservction during the snoHmelt period--
April 15 to June lS. The flood control space Hill be used "ny time
the conservction cap&ci ty is full cend the river inflow eXCEeds 10,000
sc.cond-fE.et. Sedimentation will tncro2ch on thE; cdloc2tions givt:n
above, and it is e stimQ.ted tha t after 50 yenrs of us~ the cOllscrvn tion

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