Wood River (Illinois)

Wood River (historically, Rivière du Bois) is a 2.4 mi tributary of the Mississippi River, which it joins near East Alton, and Wood River, Illinois, to the northeast of St. Louis, Missouri.

The Wood River is formed by the confluence of its West and East forks. These come together near where they drop down from the Mississippi bluffs. The natural channel of the Wood River used to follow the Mississippi through the bottoms before joining it. This has been cut off by an artificial channel that runs through flood control structures directly to the Mississippi. In 1803, the Wood River (then known in French as '), gave its name to Camp Wood, where the Lewis and Clark expedition assembled.

The West Fork of the Wood River is 16.4 mi long, and the East Fork is 21.9 mi long. Honeycut Branch is a major tributary of the West Fork, and Girder Branch is a major tributary of the East Fork.

The mouth of the Wood River was a highly industrialized area during much of the 20th century. The Olin Chemical plant produced explosives and munitions for the wars of the last century. This remains as the Winchester ammunition plant. The Wood River petroleum refinery continues to operate on a reduced scale.

Cities, towns and counties
The following cities, towns and villages are in the Wood River watershed:
 * Alton
 * Bethalto
 * East Alton
 * Wood River
 * Woodburn

The following Illinois counties are drained in part by the Wood River:
 * Jersey County
 * Macoupin County
 * Madison County