The Andrew P. McArdle Memorial Bridge is a steel truss bascule bridge over the Chelsea Creek, just upstream of its confluence with the Mystic River and the Tobin Bridge.

The bridge is a split rolling bascule, meaning that instead of pivoting on axles, the two counterweighted spans are raised by rolling on large semi-circular gears.

According to the U.S. Federal Highway Administration 2017 National Bridge Inventory, the bridge structure's condition is poor and is "[b]asically intolerable requiring high priority of replacement.

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