Long Bridge- The second longest Bridge in the U.S. is the Huey P. Long Bridge across the Mississippi River, shown from the air. This cantilever span, completed in 1935, is 3,524 feet Long, with a main channel overhang of 790 feet. The 4,200-foot Golden Gate Bridge in San Francisco is the Longest in the U.S. February 03, 1947. (Photo by World Wide Photos).;Long Bridge- The second longest Bridge in the U.S. is the Huey P. Long Bridge across the Mississippi River, shown from the air. This cantileve