Stretching across the Mississippi River just north of St. Louis, the Old Chain of Rocks Bridge is one of the most distinctive river crossings in America — not because of its size or ornamentation, but because of a graceful, unexpected 22-degree bend that sets it apart from nearly every other bridge on the continent. Today, it stands as a pedestrian and bicycle bridge, but for decades it carried millions of travelers along the Mother Road, U.S. Route 66. Long before the bridge existed, this section of the Mississippi was notorious. The “Chain of Rocks” refers to a series of rocky ledges that created treacherous rapids, especially during low water. Steamboats struggled here, and navigation was difficult well into the 19th century. While river engineers eventually tamed the channel, the name — and the danger it implied — endured.
The bridge’s unusual bend was not an aesthetic choice but a practical one. Engineers needed to align the bridge with existing roadways on both the Missouri and Illinois sides while avoiding deep water, navigation channels, and river structures. The result was a steel truss bridge that quite literally changes direction mid-river — a feature that still surprises first-time visitors. Completed in 1929, the Old Chain of Rocks Bridge was designed to provide a safer, more direct automobile crossing north of downtown St. Louis. At the time, automobile traffic was exploding, and Route 66 had become a vital artery connecting the Midwest to the Southwest and beyond.
Like many Route 66 landmarks, the Old Chain of Rocks Bridge faced an uncertain future. Closed, deteriorating, and occasionally vandalized, it could easily have been lost. But preservation efforts gained momentum, recognizing both its engineering uniqueness and its cultural importance. After extensive rehabilitation, the bridge reopened in 1999 as part of the Route 66 Bikeway, offering pedestrians and cyclists a rare opportunity to cross the Mississippi without traffic. Today, it forms a vital link in regional trail systems and stands as one of the most beloved Route 66 structures still in use.
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