7748

• UCREFRP Catalog Number: 7748
• Author: Western Water Consultants, I.
• Title: Final Report on Little Snake River Depletions by Pot Hook, Three Fork and Powder Wash Rights.
• USFW Year: 1990.
• USFW - Doc Type: Laramie, WY.
• Copyright Material: NO

1

e

1
as needed. Instream flows below Pot Hook Reservoir were not protected and were
available for diversions by others.
3.2.2 Powder Wash Project
CRWCD holds water rights for the Powder Wash Project consisting of the Little
Snake Reservoir, Powder Wash Power Plant, and the Powder Wash Reservoir (See Table
1, page 6). The Powder Wash Dam and Reservoir site is located on Powder Wash and
is considered an alternative to the Little Snake Reservoir (Western Engineers, Inc.,
December 1983). Since the Powder Wash Reservoir right was not defined as one of the
subject rights, it was not included in this study. Under the Powder Wash Project, the
water stored in the Little Snake Reservoir would be used solely for hydroelectric power
generation. The location of the Powder Wash Project is shown on Figure 2, page 7.
For this study, it was assumed that all Powder Wash Project components are in
place at the beginning of the study period. The main project components to be modeled
are shown on a general schematic diagram (See Figure 5, page 23).
Table 4 summarizes the Powder Wash Project input data to be used in the
WIRSOS modeling. The decreed storage amount for Little Snake Reservoir is 164,690
AF. However, the decree does not define the dead, inactive and active storage amounts.
For proper operation of the power plant turbines, a minimum head needs to be
maintained in the reservoir. In a report prepared for the CRWCD, Western Engineers,
Inc. (December 1983) assumed a minimum head of 70 feet (Elevation 6050 feet) with no
27