Arkansas River GeographyThe Arkansas River headwaters source is near Leadville,Guest Posting Colorado. The river technically ends in the Mississippi, which leads out to the ocean. The river drops 10,000 feet in the first 125 mile stretch. Within this stretch, the River carves through a large canyon now called the Royal Gorge. Because of the rapid drop of elevation, this stretch of river is popular for whitewater rafting and other river recreation. In total, the river drops 11,400 feet and covers a total of 161,000 square miles. The Arkansas River basin drains 24,904 square miles.From Colorado, the Arkansas River then runs through Kansas, Oklahoma and Arkansas, before meeting up with the Mississippi River. In total the river runs 1450 miles, which makes the Arkansas River the longest tributary in the Mississippi-Missouri water system.Carving out many canyons and gorges, perhaps one of the most well known is the Royal Gorge. With a width of 50 feet at its base and a few hundred feet at its top, and a depth of 1200 feet in places, the 10-mile-long canyon is a narrow, steep crevasse through the granite of Fremont Peak.The Arkansas River is now used as a main waterway for commerce, with the system being formerly called the McClellan-Kerr Arkansas River Navigation System or MKARNS. This specific stretch of the river is 445 miles. It takes a commercial towboat 5 days to travel the MKARNs distance. The commercial stretch of the river has multiple dam and lock systems allowing for greater control over the navigation efforts. The Arkansas River is used for waterway commerce, recreational activities (such as whitewater rafting) and wildlife preservation.Arkansas River HistoryThe Arkansas River was first discovered by Europeans before the Mississippi River in 1541. After Francisco Vasquez de Coronado forded the river, Hernando de Soto was on the lower river, when he later discovered the Mississippi. The Arkansas River had long been used by native Indians, who relied on the river for a source of food and shelter.The Arkansas River was claimed in 1682 by La Salle in the name of the king of France. A few years later, a fort was established on the banks of the mouth of the Arkansas. The river fort was called “poste Aux Arcansas” otherwise known today as the Arkansas Post. This became part of the Louisiana territory, which transferred to the hands of Spain after the Treaty of Paris in 1763.Perhaps the most important part in recent history for the Arkansas River came in 1787, when George Washington claimed that the navigable waters leading to the Mississippi and St. Lawrence.. shall be common highways and forever free…without any tax, impost or duty…” making the Arkansas River free for all future commerce and business. After that, many foreign countries began using the waterways to transport goods inland. In 1803 the United States purchased the Louisiana Territory, including the Arkansas River basin. The Arkansas River also became a very popular route for steamboats transporting people inland from the Mississippi. Many settlements had already been established along the banks and surrounding areas of the river. By 1890, 20,818 acres of land in Kansas were being irrigated by the Arkansas River. From there on, irrigation projects and wells began expanding from the river into the Arkansas valley.The largest flood happened in 1927. The Arkansas flooded due to huge amounts of rainfall, creating a 6-8 foot wall of water shooting down the river. Every levee broke as the flood made its way to the Mississippi River. Since that date, many dams and locks were built for a total commerce and control solution for the Arkansas river. On December 30, 1970 the water was opened and ready for use. All locks and dams are still in operation, and have been successful ever since.Arkansas River Rafting and RecreationOne of the most popular recreational activities on the Arkansas River is whitewater rafting. Popular Colorado rafting trip are commercially run through the Colorado regions of the Arkansas River. Brown Canyon, Narrows, Bighorn Canyon, Numbers, Royal Gorge are all popular section and spots on the river that whitewater rafters often hit. The river is often too large to run your own private trip through unless you have previous experience and proper equipment.Outside of river rafting, the Arkansas River is also lined with campground, RV parks and recreational facilities for planning vacations and trips along the river