Kansas v. Colorado refers to a number of cases heard by the Supreme Court of the United States: In 1994, the Special Master issued his first report, which recommended that the Court find Colorado in violation of the Compact in certain respects. Each lock measures 110 feet (34 m) wide and 600 feet (180 m) long, the standard size for much of the Mississippi River waterway. Also in the 1540s Hernando de Soto discovered the junction of the Arkansas with the Mississippi. The treaty was made shortly after "Old Settler" Cherokee were pushed out of Texas and moved to near what became known as Webbers Falls on the Arkansas River. The Fourche LaFave Bridge in Perry County is listed on the National Register of Historic Places. [21] In mid-April 1822, the Robert Thompson, towing a keelboat, was the first steamboat to navigate the Arkansas as far as Fort Smith. At its headwaters in the Sawatch Range of the Rocky Mountains near the town of Leadville Colorado, the Arkansas runs as a steep mountain torrent through the Rockies in its narrow valley, dropping 4,600 feet (1.4 km) in 120 miles (193 km). (It's not so easy to define how long a river is. The Arkansas River is quite shallow through Arkansas and Oklahoma, and was naturally incapable of supporting river traffic though most of the year. It flows east into the Midwest via Kansas, and finally into the South through Oklahoma and Arkansas. The mouth has changed since plotting by USGS to Mississippi River Mile 580 from Mile 582 in the 1980 survey. From Leadville the Arkansas River flows southeast for about 100 miles (160 km) to … The Arkansas River is 1,469 miles long and the sixth-longest river in the United States. Just west of Pueblo, Colorado, the river enters the Great Plains. 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. Some users elected to take the challenging Cimarron Cutoff starting at Cimarron, Kansas.[22]. The specifications for the channel itself are as follows: Many nations of Native Americans lived near or along the Arkansas River in its 1,450 mile (2334 km) stretch, but the first Europeans to see the river were members of the Coronado expedition on June 29, 1541 near the site of Dodge City, Kansas. The May 2002 I-40 bridge disaster took place on I-40's crossing of Kerr Reservoir on the Arkansas River near Webbers Falls, Oklahoma. The Arkansas River is a major tributary of the Mississippi River. [8] The Arkansas River's mouth is at Napoleon, Arkansas, and its drainage basin covers nearly 170,000 square miles (440,000 km2). [23] By 1890, water from the Arkansas was being used to irrigate more than 20,000 acres (8,100 ha) of farmland in Kansas. Just this one point-to-point float takes a weekend to complete or longer if you want to explore shore side. The headwaters derive from the snowpack in the Sawatch and Mosquito mountain ranges. That's putting pressure on old levees and making it hard for some residents to evacuate. Tributaries include the Canadian River and the Cimarron River, both flowing from northeastern New Mexico, and the Salt Fork Arkansas River. Brown and Rainbow Trout tend to dominate the river. The wood is soft and easily worked with the crude tools carried by both the French and Indians. Tributaries include the Cimarron and the Salt Fork Arkansas rivers. Clean restrooms (especially for a public park/trail), lightly used (compared to other urban parks in Colorado), well maintained and litter free. 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