For the past half century, the river transportation industry has grown rapidly, transporting many bulk materials, including oil, coal, lumber, and grain. To make full use of the inland waterways, the U.S. Army Corps of Engineers and local interests have worked together to develop ports and harbors on many rivers and streams. The district has developed ports of all sizes, from the 245-acre Vicksburg Harbor-one of the busiest ports on the lower Mississippi-to the 10-acre Claiborne County Port near Port Gibson, Mississippi. The Vicksburg District has been involved in various aspects of port development and construction on the Ouachita, Mississippi, Red, and Arkansas Rivers.