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August 2018

WSDOT Develops First Diverging Diamond Interchange in Lacey

The image shows a graphic overlay of WSDOT’s new diverging diamond interchange on Marvin Road and Interstate 5 in Lacey, Washington.

On 22 August 2018, construction bidding started for Washington State’s first diverging diamond interchange (DDI) for Washington State Department of Transportation (WSDOT) for Interstate 5 (I-5) in Lacey. Although it’s the first one built in Washington State, over 70 versions have been built throughout the United States. The interchange will be located between I-5 and State Route 510, where the new crisscrossing lanes will be built—updating ramp terminals, widening the existing bridge, and adding a southbound lane.

Teaching the Next Generation of Bridge Engineers

Jim Guarre, BergerABAM senior vice president, is lead instructor for the CESG 529 Bridge Engineering course.

Experienced bridge engineers from BergerABAM are back in school this summer to teach a bridge engineering class at the University of Washington (UW). The College of Engineering, Structural and Geotechnical Engineering, Course 529 [CESG 529 Bridge Engineering] is a graduate-level course in the Civil and Environmental Engineering (CEE) Department at UW. The nine-week lecture series covers a variety of bridge engineering studies, including types and sizes; design load and resistance factors; seismic design; design of prestressed concrete girders, structural steel girders, decks, expansion joints and bearings, crossbeams, columns, foundations, and abutments; and bridge construction practices.