Mayor Marty Walsh says the state has overturned the Quincy Conservation Commission's rejection of the proposed bridge to Long Island, because "Boston's proposal meets the performance standards under the Wetlands Protection Act and minimizes impacts to coastal wetland resources in both Boston and Quincy."
The ruling by the state Department of Environmental Protection could put to the test a vow by Quincy's mayor to go to court to stop the bridge.
The Quincy commission voted last fall to reject Boston's plans to bring the bridge back.
Boston wants to restore the bridge - shut in 2014 for safety reasons, then torn down - as a way to turn the island into a substance-abuse residential treatment center aimed at long-term recovery. Although the island is part of Boston, part of the bridge, and its connecting road, would be in Quincy.
According to the mayor's office, the state Department of Environmental Protection rejected both Quincy's rejection - and its appeal of a Boston Conservation Commission vote in favor of the bridge. Boston has rejected Quincy's proposal that it uses ferries for a variety of reasons, including that there could be problems getting first responders to and from the island in an emergency.