C153301 Feasibility Study

• Contract/PO #: C153301
• Contractor Name: Cache La Poudre Reservoir Company
• Contract Type: Loan
• Water District: 3
• County: Larimer
• Bill Number: SB 77-35
• Loan Projects - Doc Type: Feasibility Study

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EV ALUA II ON OPAL TE RNATE REPAIRS ' , '
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TO THE CACHE LA f>OUDRE RESERVOIR DAMS. :,,'

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CONCLUSIONS AND RECOMMENDATIONS

Taking all factors into consideration,
that Alternate No. lor Alternate No.
factory repair to the existing dams.

it is our recommendation
2B would provide a satis-

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Both altern~tes provide either a cutoff to reduce seepage or
control seepage 'under the dam and an impervious face to reduce
seepage through the existing dam. By constructing a new embank-
ment on the upstream dam face and a new embankment on the down-
stream face, the stability of the dam is greatly increased.
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Also, the construction of a ne\q outlet and service spillway will
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provide a safety feature that cannot be guaranteed by repairs
to the existing outlet tunnel and channel. Indirectly, the new
outlet will also provide an increased stability of the dam in
that excavation of the existing outlet means removal and recon-
struction of the poorest section of the dam. Renovation of the
existing spillway would be as according to the State Engineer's
requirements. If repair to the existing dam is authorized, it
is imperative to commence the schedule enclosed in,order to start
construction by fall of 1976.

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