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Pontoon Construction for the Hood Canal Bridge, Tacoma A red tower crane stands out against the Tacoma skyline. A view of the pontoon construction site from above.Return to top Carpenters set up and install the first pontoon wall forms.Return to topPontoon Float-Out for the Hood Canal Bridge The day before float-out, crews make final preparations to float three finished pontoons out of the graving doc.Return to top The first pontoon out of the graving dock.Return to top A tug pulls the second pontoon out of the graving dock. Two tugs at bottom prepare to tow the third pontoon.Return to top A tug pulls the third pontoon from the graving dock.Return to top Water leaves the graving dock after pontoons are floated out. The graving dock gate will be moved back into place after inspections, and the water pumped out to prepare for the second cycle of pontoon construction.Return to top