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

I
I
I
I
I
I
I
I
I
I
I
i
t
I
I
I
I
I'
I

Riparian birds in particular have increased in both
number and diversity. Nesting riparian birds were used
in this study to indicate how terrestrial wildlife
responds to changes in vegetation. This was done
because birds are directly dependent on the quality and
extent of riparian vegetation, and because more
pre-1983 data are available for birds than for other
Grand Canyon terrestrial vertebrates.

Grand Canvon white-water boatina. The Colorado River
through Grand Canyon is one of the finest stretches of
white water in the world. The rapids and the'
magnificent scenery make these white-water trips
(which can last as long as 30 days) a
"once-in-a-lifetime" experience. Boaters spend their
day running the big rapids, floating calm stretches of
the river between towering walls, hiking side canyons,
and visiting special natural and archeological sites.
Camps are usually made on sand beaches, which provide
the most desirable camping locations along the river
(Figure III-1). Reservations for commercial trips,
which constitute about 85 percent of the total, - are
usually made one year in advance, and persons may wait
up to five years to obtain a permit for a private trip.

Trout fishing. Over the past 20 years, the trout
fishery has received national prominence. The average
size of fish caught peaked in 1978 and use of the
fishery peaked in 1983 at 52,000 user-days. Due to
the popularity of the fishery and increased fishing,
more restrictive fishing regulations were introduced in
1978, 1980, and 1986 by the Arizona Department of Game
and Fish (AGF) to reduce fishing pressure.

21