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New Bay St. Louis Bridge Begins to Take Shape

From: MDOT         Filed 9/25/06 GCN

The Mississippi Department of Transportation (MDOT) is announcing a significant event in the construction of the US 90 Bridge across Saint Louis Bay.  Shipments of bridge beams have begun to arrive and be placed on the bridge piers on the east end of the new bridge.  District Engineer Ricky Lee says that the bridge beams signify progress in the construction of the new bridge.  The bridge will begin to take shape marking a critical achievement in the construction period. “Once the beams are in place, the public will begin to see the bridge take shape,” said Lee.  “The next step will be construction of the bridge deck, yet another noteworthy accomplishment in the project.”


MDOT awarded GAW, AJV, the $266.8 million bridge replacement contract in January of this year.  The joint venture is composed of Granite Construction Company of Watsonville, California, and Archer Western Contractors of Atlanta, Georgia. GAW had seven of the beams delivered and set today and representatives from the company expect to continue those installations tomorrow. (Photographs available upon request)


To expedite the construction of the new bridge MDOT elected to use the design-build method of project delivery  This method helps to accelerate major construction projects and eliminates delays.   The bridge is expected to be opened to two lane traffic in May 16, 2007 with final completion scheduled for November 13, 2007.


The project involves demolishing what remained of the old bridge, which has now been removed in its entirety and its replacement by a new bridge.  The new bridge will have four, 12-foot travel lanes (two in each direction) separated by a concrete median barrier, with an eight-foot inside shoulder and 10-foot outside shoulder. It will also include a 12-foot wide shared use pedestrian/bicycle lane on its south side. The new structure will provide approximately 85-ft. of vertical clearance for the marine traffic traversing the bridge and will be approximately 150 feet north of the old structure. The beginning and ending of the bridge is where it was originally, though slightly elevated on the east side.

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