The Illinois River Bridge, also known as the Midway Bridge, is a historic concrete arch bridge near Siloam Springs, Arkansas. It is located in Ozark National Forest, about 6 miles (9.7 km) east of Siloam Springs, at the end of Chambers Springs Road south of United States Route 412. The bridge has two elliptical arch spans, each spanning 68 feet (21 m), with a total structure length of 139 feet (42 m). Built in 1922 by the Luten Bridge Company of Knoxville, Tennessee, it is one of a modest number of bridges of this once-popular and common type remaining in the state.