Recent photos of the construction of the new 14th St. ( Duwamish River ) Bridge. Top Photo: view of East Span with new cofferdam behind the barge. Middle Photo: view of the new cofferdam on West side of span. Bottom Photo: view of original East Span. The interesting thing in this view is the eight vertical I-beams that had to be installed on the old section in order to hold the weight of the crane parked on top. The bridge could not hold the load of a crane that was needed to build the new bridge. Driving the 8 beams into the river bottom to add strength was a cool, engineering idea.
Recent photos of the construction of the new 14th St. ( Duwamish River ) Bridge. Top Photo: view of East Span with new cofferdam behind the barge. Middle Photo: view of the new cofferdam on West side of span. Bottom Photo: view of original East Span. The interesting thing in this view is the eight vertical I-beams that had to be installed on the old section in order to hold the weight of the crane parked on top. The bridge could not hold the load of a crane that was needed to build the new bridge. Driving the 8 beams into the river bottom to add strength was a cool, engineering idea. 
Bluestar2012's Photoblog 