8087

• UCREFRP Catalog Number: 8087
• Author: Valdez, R. A. and B. R. Cowdell.
• Title: Lake Powell Inflow Study. Annual Summary Report - 1994.
• USFW Year: 1994.
• USFW - Doc Type: 453-1,
• Copyright Material: NO

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River fishes, including Colorado squawfish, razorback suckers and humpback chub (Gila~. Increased
numbers of young Colorado squawfish in the inflow following spring runoff and rain induced freshetS lead to
the hypothesis that large numbers of young (age-O and age 1+) Colorado squawfish are being transponed
annually into this inflow. The survival of these fish is believed to be low because of the small amount of
nursery habitat (i.e., backwaters) and the large number of fish predators in Lake Powell It is also possible
that larval razorback suckers, hatched in the upper Green River, may also be transponed into Lake Powell
and lost from the system because of a lack of flooded bottomlands and abundance of predators in the inflow.

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2.0 STUDY AREA

This investigation was conducted on the Colorado River inflow to Lake Powell in Utah, from Imperial Canyon
(RM 200) to Hite Bridge (RM 170) (Figure 1). Access to this area was by motor boat from Hite Marina.
All river miles (RM) referred to in this repon are from Belknap's Canyonlands River Guide (Belknap et al.
1974). A detailed map of the Colorado River inflow to Lake Powell is available in this guide.

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Figure 1. GenerallOC1uon of the Lake PoweU inflow study area.

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