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作成日: 2022/07/08 08:28

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From Simple English Wikipedia, the free encyclopedia
		
		
		
		
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		Colorado RiverMap of the Colorado WatershedLocationCountriesUnited States, MexicoPhysical characteristicsSource&nbsp;&nbsp;-&nbsp;elevation~2700 m (~9000 ft)
MouthGulf of CaliforniaLength2,330 km (1,450 mi)Basin size629,100 km² (242,900 mi²)Discharge&nbsp;&nbsp;-&nbsp;average620 m³/s (22,000 ft³/s)[1]

Colorado River in the Grand Canyon from Desert View
  A sheer cliff of Vishnu Schist, a basement metamorphic rock from 1.75 billion years ago
  The Colorado River next to Page
The Colorado River is a river in the southwestern United States and northwestern Mexico. It is approximately 1,450&nbsp;miles (2,330&nbsp;km) long. It drains a part of the dry regions on the western slope of the Rocky Mountains. 
The natural course of the river flows into the Gulf of California. The heavy use of the river as an irrigation source for the Imperial Valley has desiccated the lower course of the river in Mexico. Now it no longer always reaches the sea.
On its way the Colorado River runs through Colorado, Utah, Arizona, Nevada, California and Mexico. The Colorado River drains 242,900 sq mi (629,100&nbsp;km²). Total flows of the river range from 4000 cubic feet per second (570 m³/s) in droughts to 1,000,000&nbsp;ft³/s (28,000 m³/s) in severe floods. With the construction of massive power dams on the lower course of the river, floods of over 70,000&nbsp;ft³/s (2000 m³/s) are rare. The mean flow of the total river before diversion is 22,000&nbsp;ft³/s. 
Historically, the flow was much higher before water usage began in the basin.

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