International Bridge Technologies

Elwha River Bridge – Port Angeles, Washington

Technical details
Clallam County Public Works Department

Construction Completed: 2009

Port Angeles, Washington
Designer: BergerABAM, Contractor: Parsons
SYSTRA IBT’s Role: Construction Engineering


Main Span: 255 ft (78 m)

Side Spans: 132 ft (40 m) & 201 ft (61 m)

The 589 ft (180 m) structure includes a 255 ft (78 m) main span with 132 ft (40 m) and 201 ft (61 m) side spans. The bridge was built using a combination of cast-in-place balanced cantilever and cast-on-falsework construction methods. Typical segments measured 14.7 ft (4.5 m) long by 31 ft (9.5 m) wide at deck level and 16 ft (4.9 m) wide at the webs. The western cantilever required one of the form travelers to follow a horizontal curve with a 185 ft (56.4 m) radius while remaining on the narrow box deck.

After closure of the superstructure spans, a pedestrian walkway composed of 15 ft (4.6 m) wide by 6 in (152 mm) thick precast panels were suspended from the soffit of the box using steel hanger rods spaced every 8 ft. (2.4 m) The bridge accommodates two 10 ft
(3 m) traffic lanes and two 4 ft (1.2 m) shoulders on the box girder deck.


  • 2010 Roads & Bridges  Top Ten Bridges Award, #7
  • 2010 Federal Highway Administration and State Department of Transportation Award of Excellence

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