WSP03537

• File Number: 8446
• Description: Cache La Poudre Platte Project
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 10/1/1987
• Title: Status of Present Studies Cache La Poudre Project
• Water Supply Pro - Doc Type: Report/Study

Stage 1: The first stage consists of the mainstem water
storage reservoir and a conventional hydroelectric
plant of about 20 MW capacity for power generation
from flow releases to the Poudre River. The
mainstem reservoir would be located downstream of
the community of Poudre Park and could provide
approximately 200,000 ac-ft of water storage at a
normal reservoir water surface elevation of 5630 ft
with a surface area of about 1250 acres. The
reservoir could be formed by constructing a dam at
the Grey Mountain site two miles downstream of the
confluence of the mainstem and North Fork of the
Poudre River, or by constructing a dam just below
the confluence which would result in 50,000 ac-ft
less water storage. If Stage 2 is implemented, the
mainstem reservoir would also provide the means of
diverting water into storage in Glade Reservoir.
If Stage 3 is implemented, the mainstem reservoir
would also serve as the afterbay for the
pumped-storage hydroelectric plant.

Stage 2: The second stage would consist of the Glade
Reservoir which would provide water storage in a
natural depression called the Hook and Moore Glade
north of Ted's Place off of the Poudre River. The
facilities necessary to divert water from the Stage
1 mainstem reservoir would also be included in
Stage 2. Glade Reservoir could provide
approximately 320,000 acre-ft of water storage at a
normal reservoir water surface elevation of 5600 ft
with a surface area of about 2500 acres.

Stage 3: The third stage would consist of the pumped-storage
hydroelectric plant and necessary transmission
facilities. The power plant could be constructed
at or below ground surface on the north shore of
the mainstem reservoir and could have a generating
capacity of approximately 2100 MW. The third stage
would also include the Cache la Poudre Forebay
Reservoir for the operation of the pumped-storage
hydroelectric plant. This reservoir would provide
30,000 to 50,000 ac-ft of storage covering 200+
acres at a normal reservoir water surface elevation
of 7000 ft.

4.0 AUTHORITY'S EXTENSION OF CACHE LA POUDRE BASIN STUDY

As previously stated, the Authority is presently providing funding to
complete key environmental studies and perform additional engineering and
economic analyses in order to preliminarily assess the feasibility of a
water storage project in the Cache la Poudre Basin without pumped-storage
hydroelectric components. This funding is being used to study primarily the
Stage 1 project described above. The reason for focussing on the Stage 1

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