<Tr> <Th_colspan="2"> Statistics </Th> </Tr> <Tr> <Th> Daily traffic </Th> <Td> 78,100 </Td> </Tr> <P> The Arthur Ravenel Jr . Bridge is a cable - stayed bridge over the Cooper River in South Carolina, USA, connecting downtown Charleston to Mount Pleasant . The eight lane bridge satisfied the capacity of U.S. Route 17 when it opened in 2005 to replace two obsolete cantilever truss bridges . The bridge has a main span of 1,546 feet (471 m), the third longest among cable - stayed bridges in the Western Hemisphere . It was built using the design - build method and was designed by Parsons Brinckerhoff . </P> <P> The first bridge to cross the lower Cooper River opened in 1929, eventually named the John P. Grace Memorial Bridge for former Charleston mayor John P. Grace, who spearheaded the project . The main span of the double cantilever truss bridge was the fifth longest in the world at 1,050 feet (320 m) and soared 150 feet (46 m) above the river . The main span of the second cantilever was the twelfth - longest in the world . The total length of the structure was about 2.7 miles (4.3 km). Following a 17 - month construction at a cost of $6 million, it opened with a 3 - day celebration that attracted visitors from around the globe . Engineers and critics proclaimed colorful descriptions of the unique structure, deeming it "the first roller - coaster bridge" and citing that "steep approaches, stupendous height, extremely narrow width, and a sharp curve at the dip conspire to excite and alarm the motorist ." Privately owned originally, a $1.00 toll was charged for car and driver to cross . In 1943 the state of South Carolina purchased the bridge, and the tolls were lifted in 1946 . </P>

What is the length of the ravenel bridge