7423

• UCREFRP Catalog Number: 7423
• Author: U.S. Bureau of Reclamation.
• Title: Glen Canyon Environmental Studies Draft Report, September 1987.
• USFW Year: 1987.
• USFW - Doc Type: Washington, D.C.
• Copyright Material: NO

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The vulnerability of the humpback chub population might
be reduced through efforts to protect the Little
Colorado River watershed and critical habitat from
environmental threats.

(5) Several additional non-operational or management
alternatives exist which could enhance the
environmental resources downstream of Glen Canyon Dam.

Implementation of these alternatives might relax some
constraints on operations that would be necessary to
prevent resource degradation.

II

Management options

~

This study was designed to provide information for a
decision by the Secretary of the Interior concerning
the need to take further action to reduce impacts to
the environment and recreation in Glen and Grand
Canyons. Based on the study finding that the current
operations of Glen Canyon Dam do adversely affect the
downstream environmental and recreational resources,
the study team has identified some possible management
options.

(1) Feasibility studies of changes in operations:

These studies would evaluate the economic, social,
legal, environmental, and physical consequences of
operational modifications to protect downstream
environmental and recreational resources. National
Environmental Policy Act activities would be included.

As part of this effort, policy questions, such as
quantification of "602(a) storage," might also be
addressed as one means of reducing the probability of
flood releases.

(2) Feasibility studies of non-operational means to
protect critical resources:

Non-operational means may be available to protect
resourc~s without constraining dam operations.
possible measures include hatcheries to replace trout
reproductive losses and a multi-level dam intake
structure to warm water to protect humpback chub and

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