What is the depth of the Mississippi river?

It ranges from 3 ft way at the head-waters in northern Minnesota down to 200ft at the base near New Orleans. Between St. Paul, MN and Baton Rouge, LA, the Army Corps of Engineers use a system of 29 locks & dams to maintain a 9 foot depth for commercial barge traffic. From Baton Rouge to the Gulf of Mexico, they maintain a 45 foot depth to allow ocean-going ships access to ports in Baton Rouge. Through New Orleans, the river depth averages around 200 feet.