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Last modified
8/11/2009 11:32:57 AM
Creation date
8/10/2009 4:48:40 PM
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UCREFRP
UCREFRP Catalog Number
8169a
Author
Brookshire, D. S., M. McKee and G. Watts.
Title
Draft Economic Analysis of Proposed Critical Habitat Designation in the Colorado River Basin for the Razorback Sucker, Humpback Chub, Colorado Squawfish, and Bonytail.
USFW Year
1993.
USFW - Doc Type
\
Copyright Material
NO
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Section 3: Physical and Economic Settings <br />A. Physical Setting <br />The headwaters of the Colorado River Basin originate in the Rocky, Wasatch, and San Juan <br />mountains of Colorado, Wyoming, Utah, and New Mexico. The Basin drains approximately <br />242,000 square miles of land in the United States and about 2,000 square miles of land in <br />Mexico. The portion of the Basin that resides in the United States encompasses parts of the <br />States of Arizona, California, Colorado, Utah, Nevada, New Mexico, and Wyoming. To <br />facilitate management of water resources, the Basin was divided into Upper and Lower Basins <br />(Figure I-3-1) by agreement between the seven Basin States in the 1922 Colorado River <br />Compact. The Upper Basin begins at the headwaters of the Colorado Basin, and ends below <br />Lee's Ferry, Arizona (16 miles below Glen Canyon Dam). Major drainages in the Upper <br />Basin include the Upper Colorado, Green, Gunnison, and San Juan rivers. The Lower Basin <br />begins at Lee's Ferry, Arizona, and ends at the United States/Mexico border. Major drainages <br />in the Lower Basin include the Lower Colorado, Little Colorado, Virgin, and Gila rivers. The <br />Gila River drainage also includes the Salt and Verde river drainages. <br />The size and diversity of the Basin encouraged the development of a variety of fishes. <br />Changes in drainage structure due to geological factors also contributed to the creation of <br />new, isolated fish species that added to the diversity of the Basin. The riparian and wetland <br />areas along the streams and rivers provided a habitat for invertebrates, amphibians, reptiles, <br />birds and mammals. The riparian forests and wetland vegetation provided forage and resting <br />areas for migratory waterfowl and songbirds. <br />I-10 <br />
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