9552

• UCREFRP Catalog Number: 9552
• Author: U.S. Fish and Wildlife Service.
• Title: Management Plan for the Big-River Fishes of the Lower Colorado River Basin
• USFW Year: 2004.
• USFW - Doc Type: amendment and supplement to the Bonytail, Humpback chub, Colorado pikeminnow, and Razorback sucker Recovery Plans.
• Copyright Material: NO

Location: Coconino and Mohave Counties AZ
Geographic Boundary: Glen Canyon Dam to Separation Rapid.

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Description of Habitats Available: This is a riverine reach with flows
controlled by Glen Canyon Dam. Habitats include rapids, runs, deep
channel pools, and shoreline eddies, pools and small backwaters. 1t
includes the spring-fed lower 21 km of the Little Colorado River to the
confluence with the Colorado River. Other small tributaries, such as the
Paria River, Bright Angel Creek, Kanab Creek, and Havasu Creek, join
with the main river through the canyon. These tributary streams provide
pools, riffles and quiet water habitats.
Land Ownership/Management Agencies: The National Park Service
(Grand Canyon National Park, Lake Mead and Glen Canyon National
Recreation Areas) is the primary landowner along the river corridor.
Adjacent landowners or managers include the Havasupai Tribe, Hopi
Tribe, Hualapai Tribe, and the Navajo Nation. Colorado River flows are
controlled by USBR, Salt Lake City, Utah. Arizona Game and Fish
Department is the lead for fish and wildlife management, in coordination
with other agencies.
Species/Critical Habitat Present: Humpback chub and razorback sucker
are present. Critical habitat for both species is designated in the reach
(USFWS 1994a).
Humpback .Chub
Current Status and Recovery Efforts: Historically, this species occurred
from Glen Canyon Dam to Separation Rapid. Currently, distribution of the
humpback chub in Grand Canyon is centered near the confluence of the
Little Colorado River some 102.5 RKM downstream from Lees Ferry. A
large portion of the population occurs from the confluence of the Little
Colorado River upstream 14.2 km. Other small populations occur in the
mainstem near South Canyon (RKM 50), Bright Angel Creek (RKM 240),
Shinumo Creek (RKM 180), Blacktail Rapid (RKM 205), Kanab Creek
(RKM 240) and Havasu Creek (RKM 260) (Carothers and Minckley 1981,
Minckley 1990). Several population estimates ranging from 2,700 to
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