Identify 3 rivers for which mississippi river is the base level.
is the 3 rivers :
Mississippi river
ohio river and
arkansas river.??
TRIBUTARIES OF THE MISSISSIPPI
The longest stream of river in the US is the Missouri River which begins at Three Forks, Montana (elevation 4,032 feet) and flows 2,714 miles to near St. Louis, Missouri. Many people consider the Missouri to be the main reach of the Mississippi River!
The Mississippi River, from its source at Lake Itasca in Minnesota, to the Gulf of Mexico, is only 2,348 miles long. The combined reach of the Missouri-Mississippi Rivers is 3,741 miles--a length exceeded only by the Amazon and Nile rivers. The Mississippi River has shortened by several hundred miles since the days of Mark Twain. Even today it varies 30-50 miles each year.
The Ohio River is the second major tributary of the Mississippi. It is formed in Pittsburgh by the junction of the Alleghany and Monongahela River and travels about 980 miles to Cairo, Illinois, and the Mississippi River. Interestingly, today's Ohio River Basin is approximately the northern extremety of the ancient shallow sea that is represented today by the Gulf of Mexico! Consider that nearly 1/3 of the nation's water drains past the confluence of the Ohio and Mississippi rivers at Fort Defiance in Cairo, Illiois!
The Arkansas River forms in the Rocky Mountains in Colorado and meanders 1,450 miles through Kansas, Oklahoma, and Arkansas. It is the main water source for the state of Arkansas.
There are some 250 tributaries of the Mississippi which drain a total area of more than 1,247,000 square miles--one third of the nation's landmass!
http://www.greatriver.com/tribs.htm
The Mississippi can't be a tributary of the Mississippi.
In addition to the rivers on which Bobpursley traveled, check the map on the site I posted. What is another river that flows into the Mississippi?