9582

• UCREFRP Catalog Number: 9582
• Author: U.S. Bureau of Reclamation.
• Title: Final Environmental Impact Statement - Navajo Reservoir Operations Volume III Comments and Responses.
• USFW Year: 2006.
• USFW - Doc Type: Grand Junction - Durango, CO.
• Copyright Material: NO

Volume III - Comments and Responses
FEIS - Navajo Reservoir Operations
? An 1,800-cfs pump would be required to meet NIIP demands from the
reservoir, and there is no reasonable place to install a pump station of this
size because the outlet works are located on a cliff.
? The NIIP inlet works is designed to operate while submersed in water.
During operation between 5990 and 5975 feet, the tunnel would be exposed to
a mixture of water and air flow that would likely cause cavitation damage to
the lining of the tunnel.
? Boat ramps and marinas are not designed to operate at this low lake level.
? Spawning habitat and overall habitat availability for reservoir game fish
would be impacted.
? Cultural resource sites within the reservoir basin could be exposed and
damaged by wave action.
(b) Releasing 250 cfs of NIIP's daily diversions down the San Juan River and then
intercepting and pumping it to the NIIP lands would require a diversion structure,
a pumping plant, and a pipeline to transfer the water to some point on the existing
NIIP distribution canals.
An appraisal-level analysis of this suggestion was performed. The pumping plant
and pipeline were located where the NIIP Canal and the San Juan River reach their
closest proximity to each other at Horn Canyon, below Bloomfield, New Mexico.
The analysis considered capacities for "Horn Pumping Plant and Pipeline" at
100 and 250 cfs capacities and approximately 550 feet of head. The intake structure
for Horn Pumping Plant would be a side channel structure with trash and fish
screens as required, eliminating the need for a diversion structure in the river. A
reinforced concrete pressure pipeline of the appropriate capacity would be
required for the discharge line from the pumping plant to the inlet/bifurcation of
the NIIP main canal. The total cost of Horn Pumping Plant and Pipeline is listed
in the table on the following page for the appropriate capacity and includes the
costs of the superstructure, pumps, motors, transformers, and transmission lines at
January 2003 price levels.
Yearly operation and maintenance (O&M) and costs assumed that the pumping
plant and system would only be in operation for a short duration (3 months)
during the NIIP irrigation season from April through October. Colorado River
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