JOHN JAMES AUDUBON BRIDGE

Location:

St. Francisville-New Roads, LA, USA

Description:

The new cable-stayed bridge between St. Francisville and New Roads has four lanes and provides 20 m (65 ft.) of vertical clearance. The main Mississippi River structure comprises a five span bridge with a main span of 482 m (1583 ft.), side spans of 196 m (642 ft.) and two transition spans of 49 m (160 ft.) each. It will be the longest cable-stayed bridge in North America when it is completed in 2009. This is the first Design/Build bridge project ever undertaken in Louisiana.

Key innovative features of the design include:

• optimization of the main span length to simplify pier construction and improve navigation clearances;

• simplified pylon configurations to reduce construction costs and schedule duration;

• efficient cable arrangement without significant out-of-plane inclination;

• simple direct connections at both ends of the cables; and

• simple composite deck construction utilizing proven concepts for durability, accessibility and low maintenance costs.

Owner:

Louisiana Department of Transportation and Development

Client:

Parsons Transportation Group

Scope of Work:

Audubon Bridge Constructors (a joint venture of Flatiron Contractors Inc., Granite Construction Co. and Parsons Transportation Group) won the $US 334 million contract for the Design/Build project. The bid was $US 12M below the Engineer's budget. Buckland & Taylor Ltd. performed the bid design for the composite steel cable-stayed bridge. Buckland & Taylor Ltd.'s scope of work includes the detailed design of the cable-stayed portion of the bridge with the exception of its foundations.

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