WSP12675

• File Number: 8282.300
• Description: Colorado River Operations and Accounting - Lower Basin Administrative Procedures
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 7/22/1997
• Author: FWS
• Title: Final Determination of Critical Habitat for the Southwestern Willow Flycatcher - FWS - Endangered and Threatened Wildlife and Plants - 07-22-97
• Water Supply Pro - Doc Type: Report/Study

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W AIS Document Retrieval

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[Federal Register: July 22, 1997 (Volume 62, Number 140)]
[Rules and Regulations]
[Page 39129-39147]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr22jy97-10]

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DEPARTMENT OF THE INTERIOR

Fish and wildlife Service

50 CFR Part 17

RIN 1018-AB97

Endangered and Threatened Wildlife and Plants; Final
Determination of Critical Habitat for the Southwestern Willow
Flycatcher

AGENCY: Fish and Wildlife Service, Interior.

ACTION: Final rule.

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SUMMARY: The U.S. Fish and wildlife Service (Service) designates
critical habitat for the southwestern willow flycatcher (Empidonax
traillii extimus), a species federally listed as endangered under the
authority of the Endangered Species Act of 1973, as amended (Act). The
Fish and Wildlife Service has identified 18 critical habitat units
totaling 964 river kilometers (km) (599 river miles) in Arizona,
California, and New Mexico. As required by section 4 of the Act, the
Service considered economic and other relevant impacts prior to making
a final decision on the size and configuration of critical habitat.

EFFECTIVE DATE: August 21, 1997.

ADDRESSES: The complete administrative record for this rule is on file
at the U.S. Fish and wildlife Service, Arizona Ecological Services
Office, 2321 W. Royal Palm Road, Suite 103, Phoenix, Arizona 85021. The
complete file for this rule will be available for public inspection, by
appointment, during normal business hours at the above address.

FOR FURTHER INFORMATION CONTACT: Mr. Sam F. Spiller, Field Supervisor,
Arizona Ecological Services Office, U.S. Fish and wildlife Service, at
the above address (Telephone [phone]).

SUPPLEMENTARY INFORMATION:

Background

Ecological Considerations

The southwestern willow flycatcher (Empidonax traillii extimus) is
a small passerine bird, approximately 15 centimeters (em) (5.75 inches)
in length. It is one of four subspecies of the willow flycatcher
recognized in North America (Hubbard 1987, Unitt 1987, Browning 1993).
The southwestern willow flycatcher's breeding range includes southern
California, Arizona, New Mexico, western Texas, southwestern Colorado,

Tuesday, July 22, 1997

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