I-74 Bridge

Interstate 74 Bridge
The Interstate 74 bridge as seen from the Iowa side of the Mississippi River
Official name	Iowa-Illinois Memorial Bridge
Carries	4 lanes of I-74 / US 6
Crosses	Mississippi River
Locale	Bettendorf, Iowa and Moline, Illinois
Design	Twin suspension bridges
Total length	3,372 feet (1,028 m)
Width	27 feet (8 m)
Opened	November 1935 (northbound) December 1959 (southbound)
Daily traffic	70,400
Coordinates	41°31′12″N 90°30′48″W

The Interstate 74 Bridge, originally known as the Iowa-Illinois Memorial Bridge, and often called The Twin Bridges, or the I-74 Bridge, is a pair of suspension bridges that cross the Mississippi River and connect Bettendorf, Iowa and Moline, Illinois. It is located near the geographic center of the Quad Cities.

The bridge was designed by Polish-American engineer Ralph Modjeski. The first span opened in 1935 as a toll bridge. In 1959, an identical twin span was added to satisfy increased traffic. The twin spans were upgraded to carry interstate traffic in the mid-1970s. In 2005, an average of 77,800 vehicles crossed the I-74 bridge daily, making it by far the most traveled bridge in the Quad Cities. Both the Interstate 80 and 280 bridges are up to Interstate standard, while the Interstate 74 bridge has two narrow lanes, no shoulder, and a 50 mile-per-hour (80 km/h) speed limit.

The I-74 Corridor Study is underway to study replacing the bridge with a larger one with 4 lanes in each direction.

See also

• List of crossings of the Upper Mississippi River