PROJ00259

• Contract/PO #: C153424
• Contractor Name: Colorado River Water Conservation District
• Water District: 0
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

LOWER MAMM CREEK DAM AND RESERVOIR
TYPE STORAGE TOTAL COST UNIT STORAGE COST
(ac'-ft) ($1,000) ($/ac-ft)
Earth 1,160 3,431 2,960
Earth 2,300 5,603 2,270
Earth 3,500 6,842 1,960
RCC 1,160 2,418 2,090
RCC 2,300 6,330 2,750
RCC 3,500 8,479 2,430

I
I
I
I

I
I

The earthen embankment dams provide the most inexpensive
storage in all size ranges at the Upper Mamm Creek site. The smallest
RCC dam at the lower site is about 1/3 the cost of its earthen
counterpart, but at the medium to large size ranges the earthen
embankments become more economical on a cost per acre-foot basis.

I

1 . General

I
I
I
I
I
I
I

G. Beaver Creek Dams and Reservoirs

Water storage facili ties L~ the Beaver Creek basin were not
formally studied as part of the USBR work in 1982. Previous project
formulations included canals and conduits which transferred water from
the West Divide/Mamm Creek basins westward crossing Beaver Creek and
diverting available Beaver Creek water to service areas further west.

As far as we have been able to determine, this is the first
study which has formally addressed the possibility of water storage in
the Beaver Creek Basin itself.

The Beaver Creek Basin extends from its source at about ele-
vation 11,000 ft northward t) its mouth at the Colorado River.
Throughout its length the stream channel is steep (10% + ) and does
not afford an efficient reservoir location. Because- no clearly
attractive sites exist, two sites ,..ere identified as the most pro.
mising and used as the basis for cost estimates and further analysis.
The relative location of these two sltes is shown on Figure III-2.

IV-25

I
I
I
I
I

The lower slte is located offstream, on a tributary which
still allows diversion of main stem flows into the reservoir. This
site is shown on Figure IV-7. The second site is located far upstream