PROJ00454

• Contract/PO #: C153832
• Contractor Name: DeWeese-Dye Ditch and Reservoir Company
• Contract Type: Loan
• Water District: 12
• County: Custer
• Bill Number: HB 98-1189
• Loan Projects - Doc Type: Feasibility Study

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Feasibility Report for Dam Safety Modifications to DeWeese Dam
April 22, 1997

3

stability requirements for the extreme loading condition [2]. The inability of the existing crest
raise sections to meet accepted factors of safety under usual and unusual loading conditions is
primarily a result of our assumption of no bond at the contact between the existing crest raise
sections and the original dam, Our observations and evaluations of this interface suggest that the
bond at this joint is inconsistent at best, and should not be relied upon for stability of the existing
crest raise sections.

1.2 STUDY OBJECTIVE

This report presents the results of investigations of dam safety modifications to DeWeese Dam,
Specifically, design concepts, analyses results, and estimated project costs are presented for the
rehabilitation of the upper l2-foot-high crest section of the dam, The principal objectives of the
study were to:

I, Develop technically feasible concepts for modifications to the upper portion of
the dam to resolve the identified dam safety concerns; .

2. Develop opinions of probable construction and project costs for two dam safety
modification alternatives;

3. Present a qualitative assessment of a third, "no-action" alternative, including no
d~ safety modifications;

4. Identify and present qualitative assessments of significant permitting issues
relative" to development of the project;

5. Develop a proposed project implementation plan and a plan for project financing;
and

6. Prepare this report in accordance w,ith Colorado Water Conservation Board
(CWCB) guidelines as part of the Company's application to the CWCB for partial
project funding,

1.3 PREVIOUS STUDIES

Previous studies performed by GEl concerning the evaluation of DeWeese Dam include:

- I, ' Safety Evaluation of DeWeese Dam, near Westcliff, Colorado (December 19,
1994) [2]. A preliminary evaluation of the dam was completed. This evaluation
included: an inspection of the dam; review of available records and previous

96006\REPORTS\FEAS\TEXT.NEW

~ GEl Consultants, Inc,