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1 <br />• <br />CHAPTER ONE: INTRODUCTION <br />PHYSICAL DESCRIPTION <br />The Upper Colorado River Basin is defined in the Upper Colorado River <br />Basin Compact as 'Those parts of the states of Arizona, Colorado, New Mexico, <br />Utah, and Wyoming within and from which waters naturally drain into the Colorado <br />River System above Lees Ferry Arizona (Figure 1)." The Upper Basin extends 885 <br />• km north to south, 563 km east to west lorns et al. 1965 and covers 293,955 <br />( ), square km (Upper Colorado Region State-Federal Inter-agency Group 1971 a). <br /> <br />The boundary of the Upper Basin northwest from Lees Ferry, Arizona, <br />follows the crests of the Paria, Aquarius, and Wasatch Plateaus and the Wasatch <br />and Wyoming Ranges to the northern terminus of the Wind River Range in <br />Wyoming (lorns et al. 1965). Eastward from Lees Ferry, Arizona, the boundary <br />follows the Kaibito Plateau, along the northern rim of Black Mesa, across the south <br />end of the Chuska Mountains eastward to the Continental Divide (lorns et al. 1965). <br />From that point the Continental Divide forms the drainage boundary for over 1,000 <br />miles through the San Juan, Sawatch, Tenmile, Front, Never Summer, Park, and <br />• Sierra Madre Ranges and around the Great Divide Basin to the Wind River Range.