Between the two placemarks in the stream gradient folder, the Arkansas River has a stream gradient of 7.22 meters per kilometer.
One of the Mississippi River's principal tributaries is the Arkansas River. The Arkansas passes through the American states of Colorado, Kansas, Oklahoma, and Arkansas and typically flows in an easterly and southeasterly direction. At 1,469 miles (2,364 km), the Arkansas is the second-longest tributary in the Mississippi-Missouri system and the 45th-longest river in the world. It is also the sixth-longest river in the United States.
The river's origin is in the Rocky Mountains in Lake County, Colorado, near the town of Leadville. It enters the Mississippi at Napoleon, Arkansas 40 miles (64 km) northeast of Arkansas City, Arkansas. Principal cities along its route are Pueblo, Colorado; Wichita, Kansas; Tulsa, Oklahoma; and Fort Smith and Little Rock, Arkansas.
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