It opened to traffic on May 12, 2012, after a $125.3M construction project replaced the previous bridge,[2][3] a single-leaf bascule-type drawbridge.

[6] The Chelsea Street Bridge is used by the MBTA Silver Line SL3 route, which began service in April 2018.

Frequent openings of the bridge — as many as ten per day — have caused numerous delays.

Federal regulations give priority to marine traffic and require the bridge to be opened on demand.

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