Lahaina Grade Separation

Motorists traveling along Lahainaluna Road will cross the new Lahaina Bypass via a slender 130-foot single span, cast-in-place post-tensioned concrete, rigid frame bridge with integral abutments.

The superstructure consists of multiple T-shaped girders of varying width and depth. The girder depths vary from 3’-8” at midspan to 5’-8” at the abutments located at each end of the bridge span. The shallow girder depth at mid-span is facilitated by taking advantage of the massive basalt rock formations at each abutment to resist the thrust from the rigid bridge frame. The natural aesthetic of efficiency of purpose in the structural system is achieved by using the structural restraint provided by the basalt combined with the strength of the post-tensioned reinforced girders.

KSF, Inc. was the structural engineering consultant for this project.  In addition, we provided construction engineering services which included preparing precast, post-tensioning, falsework and form working drawings and quality control for the construction of structural components.


2014 Engineering Excellence Grand Conceptor Award, American Council of Engineering Companies of Hawaii

2013 Best Large Project, American Society of Civil Engineers, Hawaii Section

2013 Best Overall Project, American Society of Civil Engineers, Hawaii Section