WSP08399

• File Number: 8220.101.10
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 10/22/1998
• Title: Briefing Paper on Grand Canyon Adaptive Management Program
• Water Supply Pro - Doc Type: Report/Study

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Briefing Paper on Grand Canyon
Adaptive Management Program
October 22, 1998

Adaotive Management Program Background

. Glen Canyon Dam (GCD) was authorized in the 1956 Colorado River Storage Project
(CRSP) Act
. Glen Canyon Dam was completed in 1963
. Glen Canyon Dam was operated under the CRSP Act, CRBP Act and the Long Range
Operating Criteria
. The CRSP Act (Sec. 7) directed that oeD be operated "so as to produce the greatest
practicable amount of power and energy..," (peaking power operations)
. GeD was operated primarily for peaking power, from 1963 to resulting in rapid and
high fluctuations of flow
. Reclamation planned to uprate the power plant in 1982 and was required to conduct
environmental studies pursuant to NEP A
. Phase I Studies 1982 - 1988
. Phase II Studies 1988-
. Phase I Studies claimed significant adverse environmental impacts to Colorado River
resources downstream from the Dam
Basin States Response to the Phase I Studies:
. Not enough evidence of adverse impacts
. Opposed to further studies
. Opposed to changes in Dam Operations
. Secretary of the Interior (Lujan) in July 1989 directed that an EIS be prepared on the
Operation of GCD,
. The Secretary also directed on August 1, 1991 that less destructive "Interim Operations"
be implemented; see 1990 AOP, 1991 AOP and 1992 AOP for discussion on Interim
Operations. TheSpecifi~\Interim Operations" are described in the 1993 AOP.

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