Who was the architect of the manchac swamp bridge?

The Manchac Swamp Bridge, located in Louisiana, was designed by the engineering firm of Parsons Brinckerhoff, with the lead design by engineer and architect Richard J. "Rick" Hargrove. The bridge is notable for its long span over the swamp, which is part of Interstate 55. It was completed in 1979 and stretches approximately 23.8 miles, making it one of the longest bridges in the United States.