LPPD000411

• Contract/PO #: C150151
• Contractor Name: Windsor Reservoir and Canal Company
• Contract Type: Loan
• Water District: 0
• County: Larimer
• Loan Projects - Doc Type: Feasibility Study

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NEED FOR THE PROJECT

The WRCC initiated improvements to their system starting in 1993 with improvements to the.
Poudre Valley Canal supply ditch. Approximately 6,000 feet of the canal has been lined to reduce
seepage and to increase the stability of the ditch banks. They have continued with their
rehabilitation of the system by repairing the outlet pipe downstream of Cobb Lake, rehabilitating
the dam, outlet and spillway at Elder Reservoir, rehabilitating the dam, outlet and spillway at
Reservoir No.8, and rehabilitating the dam, outlet and spillway at No.8 Annex.

The rehabilitation work on Reservoir No.8 and No.8 Annex was completed in May, 2003. Since
these two reservoirs were drained in the fall of 2002 to conduct the rehabilitation and due to the
dry conditions, it has made it possible to excavate materials from the reservoir storage pool with
conventional excavation equipment. The WRCC has lost approximately 2,600 acre-feet of storage
in these two reservoirs and has been interested in recovering at least a portion of the lost storage.
With the condition of the reservoir storage basin this appeared to be an opportune time to remove
material from the reservoir to increase the storage. The WCRR is concerned with the loss of
storage and the potential loss of a portion of their water right if they do not perform due diligence
to maintain the storage.

EXISTING FACILITIES

The existing structures that impound Reservoir No.8 have been rehabilitated during the fall and
winter of 2002 to 2003. This work was funded by the Colorado Water Conservation Board with
a loan that includes the work conducted on the Poudre Valley Canal, Cobb Lake, Elder, and
Reservoir No.8 and No.8 Annex. The work conducted on the reservoir dam included removing
the outlet and replacing it with a reinforced concrete pipe, installing a service and auxiliary
spillway to pass the 75 % PMP flood event, installing toe drains, and rebuilding portions of the
dam embankment. The dam and its appurtenant structures are now generally up to state-of-the art
standards and should provide a structure that is safe and functional for the next 50 to 75 years.

Photographs of portions of the dam after the rehabilitation are included in Appendix A.

Windsor Reservoir & Canal Feasibility Study

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