The Washington State Dept. of Transportation is creating a list of best construction practices for floating bridges, based on results of tests conducted on a pontoon built at one-sixth the typical ...

The new 520 bridge is moving ahead on a new front with construction set to start in mid-February to produce massive concrete pontoons for the floating bridge. The project, in Aberdeen, is expected to ...

The fourth of six batches of pontoons floated out of the Aberdeen casting basin Tuesday night and Wednesday morning, headed for the new state Route 520 bridge across Lake Washington. "We're now ...

The final eight “supplemental stability pontoons” for the new State Route 520 floating bridge floated out of their casting basin this week, marking the completion of the 44 bridge pontoons built in ...