WSP00672

• File Number: 822.600.10
• Description: Colorado River Annual Operating Plan - Annual Reports
• Basin: Colorado Mainstem
• Date: 1/1/1993
• Author: USDOI/BOR
• Title: Annual Operating Plan
• Water Supply Pro - Doc Type: Annual Report

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projected to decline to 1,166 feet in June 1993, which is 18.4 MAF or 71 percent of capacity
and approximately 54 feet below full capacity.

Drawdown during the peak large mouth bass spawning period in April and May is planned to
be near the limits of decline recommended in the July 1982 final report of a 5 year study by
the Arizona Game and Fish Department and the Nevada Department of Wildlife. No flood
control releases are scheduled for 1993, but in future years, as Lake Mead refills and flood
control releases are again required by the Hoover Dam Flood Control Regulations,
consideration will be given to making these releases over the fall and winter months to avoid
high flow releases during the January or July runoff season. This distribution of water
reduces the chance of bypassing hydroelectric powerplants below Hoover Dam and avoids the
adverse impacts of higher flood control releases on fish and wildlife, recreation, water
quality, and river stabilization.

Lakes Mohave and Havasu

Mohave and Havasu Reservoirs are scheduled to be drawn down in the fall and winter
months to provide storage space for local storm runoff and will be filled in the spring to
meet higher summer water needs. This drawdown will also correspond with maintenance at
both Davis and Parker Powerplants which is scheduled for September through February.
The normal mUng pattemof these two reservoirs coincides well with the fishery spawning
period. Since lake elevation will be typical of previous years, normal conditions are
expected for boating and other recreational uses.

Lake Mohave - Accomplishments of the Native Fish Work Group

From earlier meetings involving the Bureau of Reclamation, Fish and Wildlife Service,
National Park Service, Arizona Game and Fish Department, Nevada Department of Wildlife,
and Arizona State University, a Management/Research Plan identified objectives,
methodologies, and coordinated the berm modification at Yuma Cove creating a razorback
sucker spawning, cove in Lake Mohave. In January 1991, Yuma Cove was stocked with 90
spawning razorback suckers for "on-site" production. Young suckers produced at Yuma
Cove will be moved to a larger rearing facility at Davis Cove and allowed to grow to a
length of 25-30 centimeters before being released into Lake Mohave. The goal for the next
5 years is to produce and release a minimum of 10,000 razorback suckers measuring at least
25 centimeters in length into Lake Mohave to augment the existing population.

Central Arizona Project
New Waddell Dam Operations

A key feature of the Central Arizona Project (CAP) is New Waddell Dam and Reservoir.
This reservoir is located just northwest of the Phoenix metropolitan area and will serve as the
primary regulatory storage facility for the CAP. Colorado River water will be pumped into
and released from the reservoir via the Waddell Pumping-Generating Plant (p-G Plant). The