7313

• UCREFRP Catalog Number: 7313
• Author: Upper Colorado River Commission.
• Title: Forty-Second Annual Report of the Upper Colorado River Commission
• USFW Year: 1990.
• USFW - Doc Type: Colorado River Storage Project and Participating Projects.
• Copyright Material: NO

1. ANNUAL OPERATING PLAN DEVELOPMENT
On September 29, 1989, Secretary of the Interior Manuel Lujan, Jr.
transmitted letters approving an Annual Operating Plan for water year
1990. The Operating Plan was developed through the cooperation of
representatives of the seven Basin States, the Bureau of Reclamation,
Western Area Power Administration, and other agencies.

Development of the Annual Operating Plan was accomplished with
consideration of the following major points:

1. No flood control releases are anticipated from Lake Mead.

2, There will be no excess water releases to provide a storage buffer in
Lake Mead.

3. The guaranteed annual quantity of 1.5 million acre-feet will be
delivered to Mexico.

4. All requests by Lower Basin main stream holders of surplus water
contracts in the U. S. will be fully satisfied. California's water contract
holders will be allowed to use water apportioned to but not used by
the States of Arizona and Nevada.

5. Salinity provisions of Minute 242 will be met.

2. RUNOFF, RESERVOIR CONTENTS AND RELEASES
In 1990 the snow melt inflow into Lake Powell during the April through
July period totaled 3.2 million acre-feet (MAP) that is approximately 40
percent of the long-term average. The computed unregulated discharge
at Lee Ferry for the water year ending September 30,1990 was 5,452,000
acre-feet and ranks as the fifth lowest year of record. The following
tabulation lists the breakdown of discharges in acre-feet basin wide.

Net change in surface storage
Net change in bank storage
Net evaporation +
Glen Canyon releases +
Paria River discharge +
Total Unregulated Discharge at Lee Ferry +

Acre-feet
3,357,000
81,000
628,000
8,251,000
11.000
5,452,000

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