John James Audubon Bridge, New Roads, Louisiana

Audubon Bridge, Louisiana (Photo credit: credit:

Project Officially Completed February 27, 2012.

Download DBA Project Summary Sheet – JJA Bridge

Dapp, S.D. and Brown, D.A. (2010). “Evaluation of Base Grouted Drilled Shafts at the Audubon Bridge”, GeoFlorida 2010, Advances in Analysis, Modeling and Design, Geotechnical Special Publication No. 199, ASCE, pp1553-1562.

Geo-Florida 2010 presentation by Dr. Steve Dapp.

Project Status: Completed.

Project Websites: Project Home Page.

DBA Client: Audubon Bridge Constructors Joint Venture, a joint venture of Flatiron Construction, Granite Construction and Parsons Transportation Group.

DBA Services: DBA performed geotechnical engineering and design of the drilled shaft foundations for the main bridge piers and the high level approach spans. Other services included:

  • QA review of the geotechnical reports for the pile supported approach bridges
  • Developing and analyzing the drilled shaft load test plan
  • Geotechnical engineering consulting during trial shaft installation
  • Geotechnical engineering consulting during production shaft construction

Project Highlights: The John James Audubon Bridge is a new Mississippi River crossing between Pointe Coupee and West Feliciana parishes in south central Louisiana, replacing an existing ferry service. The project includes 12 miles of roads and 8 bridges – 7 approach structures and the main structure over the river. The seven approach bridges are supported on driven prestressed precast concrete (PCC) piles. The river bridge has 4 lanes and is almost 2.5 miles long with prestressed PCC pile supported low level approaches, drilled shaft supported high approaches, and the longest cable-stayed main span in North America. The cable-stayed span is supported by two main piers in the Mississippi River. Each pier has twenty 8-foot diameter tip grouted drilled shafts as its foundation system.

DBA Photos:

JJA Bridge Soil Exploration May 2006
JJA Bridge Drilled Shaft Construction 2007
JJA Bridge Construction – Shaft W5 and W21 July 08
JJA Bridge Construction – Shaft W12 and WHA Test Shaft – August 2008
JJA Bridge Construction – East Pier – September 2008
JJA Bridge Construction – East Pier Temporary Bent Piles – September 2008
JJA Construction – West Pier, WHA Test Shaft, and O-Cell tests – October 2008
JJA Construction – West Pier and West High Approach Shafts – April 2009
JJA Construction – East Pier and East High Approach – April 2009
JJA Construction – Shaft Excavation, PIle Driving, and Cofferdams – May 2009
JJA Construction – Base Grouting and Other Construction – June 2009
JJA Construction – Pier 2W – September 2009 Photos
JJA Construction – Shaft 3W South Load Test – October 2009
JJA Construction 2010
JJA Pictures from Chris Ursery (FIGG)

Project Websites: Project Home Page. Project Updates.

Media Links: January 9, 2008

Key Participants:

Owner: ladotd-logo.png Louisiana Department of Transportation and Development

Program Manager: logo_timed.png Louisiana TIMED Program

Design/Build Team:

audubonbconst-logo_crop.jpg Audubon Bridge Constructors, a joint venture of:

logo-parsons.gif Parsons Transportation Group, flatiron-logo.jpg Flatiron Construction Corporation,

logo_granite.png Granite Construction, Inc.

Geotechnical Engineers:

Dan Brown and Associates, LLC and psilogo.gif PSI, Inc.

Specialists in Deep Foundation Design, Construction, and Testing and Slope Stability Problems