PROJ00406

• Contract/PO #: FS0004X
• Contractor Name: Green Mountain Exchange Project CWRDA
• Contract Type: Loan
• Water District: 0
• County: Grand
• Loan Projects - Doc Type: Feasibility Study

estimate water yields for alternative Joint-Use Reservoirs and alternative Green Mountain Reservoir
water exchange projects and to develop preliminary designs and cost estimates based on an
approximately uniform level of investigation. This information is required prior to any decision on ~
the next level of development of these projects.

This Study has been conducted in three phases. In the first phase, existing data was
collected and evaluated for initial screening of nine reservoir sites identified by the Authority as
candidates for Joint-Use or Replacement Reservoirs. The candidate reservoir sites for this study
were selected based on the existence of a water right or claimed water right at the site and previous
studies conducted by the Colorado River Water Conservation District, the Denver Water Board, the
U.S. Bureau of Reclamation and others. The site selection was also based on geographic location
within the Colorado River drainage. The reservoir sites are displayed on Figure 1.1.

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In conjunction with reservoir site evaluations, three alternative conveyance routes from
Green Mountain Reservoir to Dillon Reservoir were appraised to determine a "Green Mountain
Pumpback System" configuration as part of the Green Mountain Exchange Project. The screening
resulted in the selection of a pipeline route along Colorado Highway 9 for conveyance of water from
Green Mountain Reservoir to Dillon Reservoir, and selection of the following six reservoir sites for
further study.

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Wolford Mountain Site A' on Muddy Creek
Wolford Mountain Site C on Muddy Creek
Red Mountain Site on the Colorado River
Azure Site on the Colorado River
Wolcott Site on Alkali Creek
Una Site on the Colorado River

The second phase consisted of hydrologic, operational and water rights analyses using a
hydrologic simulation model. The third phase of the Study involved preliminary geotechnical
investigations, core drilling at the Wolford Mountain Site A' and the Red Mountain Site, and
subsurface investigation of the conveyance route. The third phase also included developing
reconnaissance-level project designs, cost estimates and cost-yield relationships for comparisons of
alternative reservoirs and reservoir combinations. The Study is concluded with this Final Report and
Appendixes. A Summary Report, under separate cover, summarizes this Final Report. Recognizing

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