WSP07070

• File Number: 8443.400
• Description: Narrows Project - Reports
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 5/27/1968
• Author: Asst Sec of Interior
• Title: A Report on the Narrows Unit Missouri River Basin Project Colorado Pursuant to Section 9a of the Reclamation Project Act of 1939
• Water Supply Pro - Doc Type: Report/Study

22

23

AnnuaJop.ra-
tlon,m.inte-
nanc',llnd
repl.e.m.nl

[rom an ad valorem tax, and (h) from wB-te.r cbe.rges. In addition,
it is proposed that a charge of $10,000 annually be levied against tbe
Jackson Lake-Fort Morgan Cana.l interests for services resulting in
a total esLimated 0,1\1, & R, savings of $16,000 annuaUy, This arrange-
ment would e.nable 8. sayings of $6,000 A.llDually by tbose irrigation
interesis. Total Det re\"enlles will enable amortization of tbe. irrigation
allocation of $26,199!400 within 50 years y.ithout interest.
The non-Federal operating entity would finance or repay the reim-
bursable costs allocated to recreation and fish and ,...i1dlife with interest
over a 50-yelll' period,

to ]66,370 acres of irrigable land, That Lotal salable water supply does
not include divertible return flows estimated to average 21,300 acre-
feet annually,
The total estima.ted project cost of the Narrows unit, prices ns of
October 1965, and estimated annun.1 operation, maintenance, and
repln('.ement expen5es have been allocated as follows:

TABLE I.-cosT ALLOCATION SUMMARY

Purpose

Projeelcost

A.CKNOWLEDGMENTS

IrriR.tion_...... .___________..
~:~~d.~~t~i~}i.ie::~::::::::-------' . --.--------..
R~re~tion_____ ___________. .._________..
Roed reloc.lion (Public Lew 87-!74)___
TotllL____. ._ ..._________.

$.26,199,4QQ
]9,016,100
4,620,000
11,845.500
139,000
61.820,000

I Ultimel. ~nd un~dlusled tor lima end rele 01 occ.urrPnce,

$21,400
9.100
31.300
'153.700
o
216,500

Summary statements of the Corps of Engineers, National Park
Service, Fish and Wildlife Service, and Lbe Public RealLh Service
are appended as parL of this report, The Bureau of Mines prepared a
special report in January 1961 en~itled "...\fineral ResOllrces at Narrows
Reservoir Site, Ivforgo.n County, Colo." That report was revised
in September 1964 and the latter report was updated by a mem-
orandum in Oct.ober 1965, Numerous other Federal, State, and local
agencies have furnished much information and data used in the
studies for the unit. The contributions of each agency ha.ve been of
material assistance in the investigations.

A segregation of the preceding costs with respect. to reimbursa-
bility is contained in table 2, 1\10sL of the reunb'lrsable annual
O,M, << R. for fish-wildlife and recreation will be the responsibility
of the non-Federal operating entiLy,

TABLE 2._RUMBURSABLf COSTS

Part II-GENERAL DESCRIPTION

Purpose

Project
ro"

Reimbu~8ble:
Irription________
Fish ~nd wildhfe_________..
R'Cle,l.llon___ _______.

$26,199.400
1.466..400
11.277,800
'17.943,600
19,016,100
.4,153,600
10.567,700
i3~, 000
33,876,.400
61,820,000

Nonrei~~(~~ae~~~u~~ble---------. ..--------... . .-------------
f"loodeonlrol___..________.. .______________. ...__._____________.
Fish;ndwJldl.le_____.. ..__________ .__..___________
Recle.tlon n'"" __..,_________. ...__________.. ......_____________
Roed lefoc~lion (Pubf~ l.w 8T--8T.(J...__.___________. . ...__________
lO(jl nlln'elmbursabla______. . ____________. ....._________________

Gr.ndlolaL_______..__

Annu.1
oplll1ltion,
m.inl.nance,
,,'
I.pl'um.n!

The Narrows unit. aren. in northeastern Colorado com prises approxi-
mately Lbe downstream half of the South PlaLte River Basin in
Colorado,
The upsLrearn half of the basin originates along the Continental
Divide at elevation approaching 14,000 feet. That area provides most
of the water supply of the basin from nat.ive supplies and from trans-
mountain importations. The basin slopes to tbe east and merges into
the Colorado piedmont area in \vhich lhe Narrows unit is located.
The South Pla.tte watershed through the piedmont section is a
broad rollinS plain through which Lhe river has formed a wide valley
of Hood plaLn5 nnd bench lands on river te.rrnces. The bench lands
are .ituated some 20 to 200 feeL higher thau Lh. flood plains, The
ri,-er has a grad.ient of 8 to 10 feeL per mile, Geologically, Lhe CoLorado
piedmonL section is classified as late maLure or old wiLh outcroppings
of shales and sandstones of the Pierre formaLion,
The Lwo most im,POrLanL SouLh Platte River tributaries of concern
to the Narrows umt are Kiowa and Bijou Creeks, 130th tributarie,
enter the river from the south, Both tributaries flow through areas
of poorly consolidated sediments and, during periods of high runoff,
contribute considem.ble quantities or sediment to tile ri\'er. Kiowa
Creek flows into the river within the Narrows Reservoir site. Bijou
Creek, however, empties int.o the river immediately downstream from
the Narrows Dam site. Numerous other tributaries, mostly inter-
mittent, enter tbe South Platte River from both the north and south
in the reach bet\veen Narrows Reservoir and the Colorado-Nebraska
boundary,

S22.400
20,100
144,200
186.700
9,100
11,200
9,500
o
~,IlOO
2]6,500

I One.h.11 or separll~le COUs, Does nlll include repay.ble inlerllst during ronsfrucllon 01 $Z.4,9OO lor fish ~nd .....UllIH.
'nd$2!J,500fol~cr..tlon.

to Annual benefits from all functions total $3,675,200 as follows:
1.:") irrigation, $1,631,500; lIood control, $961,000; recreation $790 000'
: - fish and wildlif,e, $292,700, Bll.Sed on a lOO-year period ~f an~lysi~
~:....: at 3}{; _percenL mterest, annual benefits \\-"ill exceed annual costs in
Lhe following reLios: toLal benefit.s, 1.62 Lo 1; direcL benefit.s only,
1.52 to 1.
The existing Lower South Platte Water Conserva.ncy District would
be the contracting ent.ity ror paymenL or aunueJ. Federal a.M. & R.
.expenses Rnd repayment of most or the capitAl costs allocated to
lITIgat.ion. The district will have t.wo basic sources of revenue: (a).