The concrete smashing, which has been the subject of complaints from both sides of the river in the last week, is part of the $53 million replacement of the Rochambeau Bridge which began this summer. Workers began the new year stripping the deck of the westbound bridge, while traffic is routed in both directions to the eastbound bridge. Residents of Newtown and Southbury heard plenty of pounding last summer when workers were driving piles into the riverbed to support a temporary bridge between the eastbound and westbound spans, Zukowski said. That temporary bridge is what feeds traffic to bypass the construction work, which is expected to be complete by 2024. A Newtown public works official agrees that backups have not been a problem, but added that accidents have increased since construction began.