Arkansas River – Longest River In Colorado

By geographic distance, the longest river across the State of Colorado is the Arkansas River. Although the Rio Grande River is longer in total length (1890-miles), the Arkansas River covers a larger surface area within the State of Colorado (324+ miles).

Headwaters of the Arkansas River

From its headwaters near the City of Leadville, the Arkansas River spans over 1,470 miles and is the 6th longest River in the United States. 

Within the Sawatch Mountain Range, the Arkansas River wraps around the base of Mount Arkansas (13,795 feet), before making its journey across multiple states including Kansas, Oklahoma, and Arkansas. The river eventually turns into a tributary of the Mississippi River.    

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