The Arkansas River is a major
tributary of the
Mississippi River. The Arkansas generally flows to the east and southeast, and traverses the states of
Colorado,
Kansas,
Oklahoma, and
Arkansas. At 1,469 miles (2,364 km) it is the sixth longest river in the United States, the second-longest tributary in the Mississippi-Missouri system, and the 45th longest river in the world . Its origin is in the
Colorado Rockies in
Lake County near
Leadville, and its outlet is at the historic site of
Napoleon, Arkansas. The Arkansas River drainage basin covers nearly 195,000 sq mi (505,000 km²). (See
watershed maps:
1) In terms of volume, the river is smaller than both the
Missouri and
Ohio, with a mean discharge of 8,460 ft³/s (240 m³/s).
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