According to MoDot,
The bridge over the Missouri River connecting St. Louis and St. Charles counties and is actually two separate bridges. The structure itself is called a "tied arch" bridge because each arch is tied together with many steel cables. Each tied arch bridge was erected on bridge piers near the banks of the Missouri River. Four barges then floated each structure to their permanent position over the Missouri River. Each bridge will carry five lanes of traffic across the Missouri River, and the westbound bridge has a separate bike trail.
*Each tied arch structure is 616 feet long, 125 feet high and 90 feet wide
*90,000 cubic yards of concrete were used for the driving surface and bridge piers
*The structures contain 16 ½ million pounds of reinforcing steel
*78,000 feet of piling (beams drilled into the ground to support the bridge)
*3,000 feet of drilled shafts (the actual holes drilled into the ground)
*The steel girders and the two arches are comprised of 33 million pounds of structural steel
*The tied arches are held together by 444,000 bolts
*If the cables of the two tied arches were all connected, they would stretch 3 ½ miles
*It is 3,244 feet from the abutment on the St. Louis side to the abutment on the St. Charles side
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