Scope and Content: The Massachusetts Port Authority (Massport), responsible for maintaining the Mystic River (later Tobin) Bridge from Boston to Chelsea, Massachusetts, was authorized by St 1964, c 682 to construct connections between that bridge and another high-level bridge to be constructed over the Charles River between Leverett Circle, Boston proper, and City Square, Charlestown, by the Metropolitan District Commission (MDC); cost of the project was to be divided between the two agencies.  Project files were created by the authority’s research/planning division in the course of interagency planning for the proposed bridge.
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