The New Orleans Lakefront Airport Floodwalls, three Bridges, Floodgate & Roadways is a multifaceted floodwall, roadway and bridge project. A two lane, high-rise bridge structure crosses the elevated Norfolk Southern Railroad main line twin tracks and the adjacent flood protection levee at two locations. One of the bridges, the East Approach, connects the two existing parallel ground level west bound traffic roadways (Hayne Boulevard and Stars and Strips Boulevard) on either side of the railroad. The other bridge, the West Approach, also crosses over the Norfolk Southern Railroad and the hurricane flood protection levee and connects eastbound Lakeshore Drive to eastbound Hayne Boulevard and eastbound Stars and Stripes Boulevard The 3500 foot long East Approach overpass and roadway project required degrading of 2200 feet of the existing earthen hurricane flood protection levee and installation of 2400 linear feet of a seven and one-half (7½) foot high concrete I-type floodwall to provide space for the installation of bridge columns and the merger with the existing Hayne Boulevard westbound roadway at ground level. The East Bridge is 1,940 feet long and 42’-10” wide and has a deck area of 83,100 square feet. The West Approach bridge includes a two lane segment 600 feet long by 42’-10” wide and two single ramps, one approximately 1600 feet long and the other is approximately 1100 feet long. Both of these ramps are 27’-10” wide. A special steel girder design was required for a long span over two roadways, the Norfolk Southern Railroad and the flood control levee. This complex design also included degrading 2200 LF of levee and replacing it with the 2400 LF of I-type floodwall. A 63 foot wide by 11 foot high floodgate was also designed and constructed at Stars and Stripes Boulevard. The bridges rise 46 feet above the average ground elevation to provide the required 23-foot clearance over the Norfolk Southern Railroad tracks. DEI also provided construction administration services and resident inspection.
The East Approach was awarded the Best Project of the Year in the State of Louisiana by the ACI Louisiana Chapter. The project also received awards from the Precast/Prestressed Concrete Institute including Best Project of the Year in Louisiana and second overall for the Southern Region.
Construction of the project was finished in 1998 at a cost of approximately $18,000,000.00.
This project required:
- a complete topographic and elevation survey of the existing features including utilities
- precise computer aided roadway geometric design to obtain minimum length of structure, super elevations, curve linear alignment, girder lengths and adherence to AASHTO criteria
- extensive levee degrading and construction of steel sheet pile and concrete I-wall
- design of 10,000 linear feet of prestressed concrete type III giders with LEAP program.