Bridges to Prosperity McNary Bergeron


On Alaska's North Slope, conventional crane construction requires the use of ice roads to provide bearing capacity and protect the tundra. This limits the construction season to the middle of winter, January through March. In order to extend the construction season, PCL proposed to incrementally launch the bridge from one abutment. McNary Bergeron provided the engineering services to analyze and strengthen the bridge for launch loads and design the temporary works to for launched construction. This method allowed the contractor to have the bridge in place before ice roads would have been completed and ensure the completion date of the project.

Our Role

McNary Bergeron & Associates performed launch analysis and strengthening design for the bridge as well as the design of the roller system, nose, launch track, and ancillary equipment.

Construction Method and Specifications

-1421 ft Twin Steel Box Girder Bridge
-Incremental Launch
-Assembled, launched, and lowered onto bearings in approximately 3 months

Building the Nigliq Channel Bridge from ConocoPhillips Alaska on Vimeo.


Conoco Phillips


PCL Construction


PND Engineers, Inc.


2013 - 2014

Data Sheet (pdf)

Current Project List