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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',,- EVALUATION OF ALTE~~ATE REPAIRS
TO THE CACHE LA POUDRE RESERVOIR DAMS

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ABSTRACT

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The purpose of this report is to present an engineering evalu-
ation of alternate repairs to the Cache La Poudre Reservoir Dams.
The report was authorized in August of 1975 at a meeting of the
Board of Directors and the Advisory Committ~e of the ,Cache La
POlldre Reservoir Company. As of that time, the Reservoir
Company had taken under advisement an Engineer's Reconnaissance
Study,of the existing dams and an evaluation report for alternate
locations of a new dam downstream of the existing dam.

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The investigation was carried out by studying the cross sections
of the existing dam as previously surveyed, by studying the soils
and subsurface conditions of the existing dams as previously
prepared by Empire Laboratories, by analyzing the topography
adjacent to the reservoir for potential emergency spillway
sites, and by carefully analyzing the existing outlet works
and present operating features of the reservoir. Detailed
field and office calculations were completed and the individual
elements were combined into 3 alternate repairs to'the existing
dams. Many factors and considerations not evident in ~he three
alternates were carefully analyzed before these alternate repairs
were selected. It was the opinion of the engineers that the re-,
pairs suggested be capable of a long life span and require a
minimum of extended maintenance beyond a reasonable service
level. It was also felt that due to the complexity of the
repairs necessary to e~s~re the stability of the dams, careful
thought should be given to all aspetts of the dam to'ensure
safety of features that may not be readily apparent from sur-
face observations. Wtih all considerations, the finished re-
pairs should provide a structure capable of maintaining the ,.., . '
quality of operation and performance as the existing structure
has done for many years.

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