Steel Construction Vol 40 no 6 - International Steel Structures | Page 15

SAISC projects
Forming a team
Multnomah County elected to use the
construction manager/general contractor
(CM/GC) method of project delivery. A
primary advantage of this method is that
the contractor, in the role of construction
manager, provides direct input to the owner
and design team regarding constructability,
pricing, scheduling and phasing of the work
throughout the design process. In 2009,
Multnomah County selected SSJV, a joint
venture between Sundt Construction and
Slayden Construction, as the CM/GC for the
bridge based on a competitive qualification
based proposal. In 2010,TYLI and CH2M
were selected to develop the final
design. To facilitate the CM/GC process,
Multnomah County established a collocated
project office with full-time staff from the
owner, owner’s representative David Evans
and Associates, the engineering design team
and the CM/GC.
The 1,275-ft main structure over the
river is flanked on the east by a five-span
concrete approach structure extending
500 ft from the riverbank into the adjacent
Sellwood neighborhood. On the west side,

the structure terminates with a significant
interchange connection to Oregon Highway
43, which is composed of approximately
3,600 ft of bridge and retaining wall ramp
structures.

moved about 4 ft since the original bridge
opened in 1925. To prevent movement
during construction and stop chronic
seasonal movements in the long term, an
anchored shear pile system that spanned
the full 500-ft width of the landslide was

The west side of the project site is located

employed. Consisting of 40 6-ft-diameter

within an ancient landslide, which had

drilled shafts connected by a grade beam

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