Down on the riverfront, under the railroad bridge that crosses the Mississippi just south of the Arch, there are sections of flood wall. They barely contained the Great Flood of 1993, when the river was 20 feet ( 6 m) over what we consider flood stage. Check that link for an amazing areal photo of the confluence of the Missouri and Mississippi Rivers on our northern edge - it looked like a sixth great lake. Also check these pictures - the waters came very close to the feet of the Arch, which is on a hill way over the river.
The authorities allowed graffiti artists to decorate a section of the floodwall, maybe for good luck. Click on the image above to get a better view.
TOMORROW'S POST: Thursday Arch Series