The Blanchette Memorial Bridge are two twin cantilever bridges carrying Interstate 70 across the Missouri River between St. Louis County and St. Charles County, Missouri, opened in 1959. Handling an average of 165,000 vehicle transits per day, it is the area's busiest bridge. Construction of the first interstate highway project under provisions of the Federal Aid Highway Act of 1956 started west of the bridge's present location. A sign commemorating the site of the nation's first interstate project stands next to Interstate 70 just east of the Missouri Route 94/First Capitol Drive overpass.
The bridge is named for French Canadian fur trader and hunter Louis Blanchette, who founded St. Charles as a post along the Missouri River; the village was the first European settlement along this waterway.
Major rehabilitations for the Westbound span have been addressed to MoDot in the late 2000s. The project started with the closure of the westbound span on November 4, 2012. The bridge will be closed in full for only 1 of the 2 years. During the closure, westbound traffic will be diverted to the freeway's east side, at 3 lanes in each direction. At other times various lanes will be closed at times to do other work. The project will be complete by late 2014. On November 18, 2012, I-70 was closed down for the first blast to remove the old westbound bridge's superstructure. The second and final blast was done on December 4th, 2012. Construction of the replacement bridge started in Spring of 2013.