Construction Today - July 2016 - 47

option was to replace the 6th Street Viaduct.
At an estimated $449 million, the replacement is considered the largest bridge project in the history of Los Angeles. Funding is
coming from the Federal Highway Transportation Administration and CALTrans.
In 2013, the city's Bureau of Engineering,
which is overseeing the project, recommended the joint venture of Skanska USA
and Stacy and Witbeck to act as the general
contractor and construction manager on
the viaduct replacement. The use of the
construction manager/general contractor
delivery model is a first for the city of Los
Angeles, but one the Bureau of Engineer
believed made the most sense for the
project. As a CM/GC, Skanska/Stacy and
Witbeck was involved early in the process.
A small staff of engineers and management
people were able to look at drawings from
the design team and provider feedback on
how to make the project more constructible
and less expensive.
The existing viaduct closed on Jan. 27
and demolition began on Feb. 5. The struc-

ture has an estimated 48,000 cubic yards of
concrete, 1,245 tons of structural steel and
4,200 tons of rebar, according to the city. The
massive size of the old bridge will require
more than 5,000 truckloads of material to be
hauled off site to make way for the replacement viaduct.
City officials wanted the new design to
become as recognizable as the concrete
bridge it was replacing, while better
fitting the modern values of the city. An
international design competition was held
in 2012 and the city chose L.A. architect
Michael Maltzan's vision for a "ribbon of
light." The design features 10 pairs of lit
arches, reminiscent of the original 6th

Street Viaduct's twin curves, viewing
areas, dedicated bicycle and pedestrian
lanes, and eight acres of recreational and
public art space below the bridge.
"Unfortunately, the iconic 6th Street
bridge is fatally damaged," Mayor Eric
Garcetti explained during the project's
groundbreaking in 2015.
"But this challenge represents a rare
opportunity to build a modern landmark
for Los Angeles that accommodates our
modern traffic needs - with improved
vehicle flow, pedestrian amenities, bicycle
infrastructure and a dramatic design that
demonstrates our city's place as the creative
capital of the world."

Northwest Excavating Inc., is a dry utility contractor, as well as an operated equipment rentals
supplier. We are a family owned and operated union company since 1959. We specialize in underground power relocation projects, and 'in-house' contracting with DWP since 2010. Our scope is
to provide a 'turnkey' underground distribution or transmission power system to the Department of
Water and Power - no need for the electrician. Our work for Skanska has been no different. They
have been a valued building partner for their Los Angeles area projects since the Metro Expo Phase II
project. Our gratitude for Skanska is strong, and we wish them much safety and success on their current and future projects - projects we will be also striving to serve with a safe, professional, skilled,
and experienced delivery.

47

JULY 2016 CONSTRUCTION-TODAY.COM


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Table of Contents for the Digital Edition of Construction Today - July 2016

Contents
Construction Today - July 2016 - Cover1
Construction Today - July 2016 - Cover2
Construction Today - July 2016 - 1
Construction Today - July 2016 - Contents
Construction Today - July 2016 - 3
Construction Today - July 2016 - 4
Construction Today - July 2016 - 5
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Construction Today - July 2016 - Cover3
Construction Today - July 2016 - Cover4
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