WSP05537

• File Number: 8443.100
• Description: Narrows Unit - Project Description
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 1/1/1967
• Title: Report on the Narrows Unit Colorado South Platte Division Missouri River Basin Project part 1
• Water Supply Pro - Doc Type: Report/Study

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Plan of Development

to improve this critical water supply situation, the Colorado Water
Conservation Board requested that a supplemental water plan for this
system be developed.

A 5-unit pumping plant, connected directly to the river outlet,
could be constructed below the Narrows Dam to provide supplemental
water for the Riverside irrigation system. The total dynamic head
would be 120 feet and the capacity of the plant would be 150 c.f.s.
A 54-inch, 4,750-foot-long discharge line would follow the downstream
toe of the dam, cross over the spillway chute, and discharge into the
existing Riverside Canal near the left abutment of Narrows Dam. The
discharge line would be constructed of reinforced concrete except for
a steel section which would extend across the spillway. A surge tank
would be required near the middle of the discharge line. Addition of
this pumping plant to the unit would require some modifications at
the discharge end of the river outlet works. Power would be provided
by a 3.75-mile, 115-kv. transmission line from the existing USBR
Greeley-Fort Morgan ll5-kv, line and a substation in the vicinity
of Narrows Dam site.

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By adding this feature, an average of about 17,000 acre-feet of
supplemental water could be pumped to the Riverside canal annually.
This pumpage would enable the service area to be increased from
22,909 acres to approximately 27,000 acres, and the improvement of
the water supply would be from 75.5 percent to 86.2 percent of the
computed requirement.

The Riverside service area is not included in the Lower South
Platte Water Conservancy District.

Bijou Pumping Plant

A pumping plant could be constructed below the Narrows Dam to
pump water from the Fort Morgan Canal outlet works to the Bijou Canal.
Some preliminary cost estimates of this installation were prepared,
but were not refined because hydrology studies indicated that approxi-
mately the same quantity of water could be provided without construc-
tion through an exchange arrangement between Narrows Reservoir and the
Bijou Canal. Such an arrangement is possible since the Bijou diversion
facilities are upstream from the reservoir.

Approximately 18,000 acre-feet per year could be exchanged to
the Bijou system, thus providing 93.5 percent of the theoretical

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