The Sunshine Bridge is a cantilever bridge over the Mississippi River in St. James Parish, Louisiana. Completed in 1963, it carries LA 70, which connects Donaldsonville on the west bank of Ascension Parish with Sorrento on the east bank of Ascension Parish as well as with Gonzales on the east bank of Ascension Parish. The approach roads on the east and west banks begin in Ascension Parish before crossing into St.