8138

• UCREFRP Catalog Number: 8138
• Author: Utah Division of Wildlife Resources, Arizona Game and Fish Department and The National Park Service.
• Title: Glen Canyon National Recreation Area Utah/Arizona\
• USFW Year: 1996.
• Copyright Material: NO

been entirely included in RIP studies. Proposals related to endangered fishes
are submitted for potential RIP funding. It is the intent of NPS and UDWR to
cooperate with recovery efforts and incorporate the RIP guidelines into
fishery efforts within the Glen Canyon NRA.
5. Lake Powell Native Fish Work Group (NFWG): Formed in 1993 at the
invitation of NPS, this group includes fishery biologists from NPS, NBS,
USFWS, BOR, state agencies, tribes, academia and the private sector. Meetings
are held annually for the purpose of coordination, review, and expanding
interagency information transfer, partnerships and expertise related to native
fish issues.
6. Universities/contractors: Fishery investigations may be conducted by
universities or independent consulting firms through contract with the NPS,
UDWR, AGFD or other funding sources. Proposals must be submitted and permits
obtained in compliance with guidelines.
7. Grand Canyon Adaptive Management Program (AMP): Related to the Grand
Canyon Protection Act and a result of the Glen Canyon Dam EIS, the AMP will
implement a long-term monitoring of effects of dam operation on resources
within Grand Canyon National Park and Glen Canyon NRA.
8. Canyonlands and other National Parks on the Colorado Plateau: Park units
along the Colorado River work cooperatively to investigate and understand how
resources and processes transcend park boundaries. NPS units will coordinate,
exchange information, and share resources and expertise for effective fish
management among park units along Colorado River.
9. Navajo Nation: The Navajo Reservation boundary lies to the south of Glen
Canyon NRA, sharing a common boundary at elevation 3720 feet. Navajo Nation
representatives participate in RIPS and NFWG.
III. G NERAL PHYSICAL AND BIOLOGICAL ENVIRONMENT
A. PHYSICAL ENVIRONMENT
1. Geography: Glen Canyon NRA is centrally located in the Colorado River
Basin in southeastern Utah and northern Arizona. Lake Powell covers 255
square miles and drains a watershed of 111,700 square miles. The watershed is
extremely varied in ecosystem type, ranging from high alpine mountains in
Colorado and Utah to and deserts and canyons of the Colorado Plateau. The
Upper Colorado River Basin drains highly erodible soils in and to semi-arid
climate. The four main tributaries into Lake Powell include the Colorado, San
Juan, Dirty Devil, and Escalante rivers. A fifth tributary, the Paria River,
enters the Colorado River 15 miles below Glen Canyon Dam, at the boundary of
Glen Canyon NRA and brand Canyon National Park.
2. Geology: The recreation area consists of highly dissected plateaus that
create a maze of deep canyons with nearly vertical walls and flat topped mesas
characteristic of the Colorado Plateau. Surface stratigraphy includes
outcrops of rock that range in age from Pennsylvanian to Cretaceous. Permian
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