A single lane access bridge at the former Ansonia Copper and Brass site could be the city’s literal link to economic progress, according to Corporation Counsel John Marini. And the state is spending $6.5 million to make it happen. Local and state officials announced last week that the site would get state money — approved by the State Bond Commission — from the Community Investment Fund 2030 to repair an access bridge to the plant, at 75 Liberty St., that would allow greater access on site for cleanup efforts. Marini said repairs are expected by 2023. The site has gotten millions over the years to help with cleanup and redevelopment. But the pace of state and federal aid has picked up over the last few. The $6.5 million comes just months after the site got $2.9 million in federal funds to demolish and remediate the former SHW Casting plant on Main Street, removing hazardous materials.