Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Dorchester Avenue is a street in Boston, Massachusetts, running from downtown south via South Boston and Dorchester to the border with Milton, where it ends. Built as a turnpike, the Dorchester Turnpike, it is mostly straight. The Boston South Bridge over Fort Point Channel, on the site of today's West Fourth Street Bridge, opened on October 1, 1805 as the first bridge connecting downtown to South Boston. Until it was sold to the city of Boston on April 19, 1832, it was a toll bridge. The Dorchester Turnpike Corporation was created by the state legislature on March 4, 1805, to build a turnpike from the east end of the Boston South Bridge to Milton Bridge over the Neponset River, on the other side of which the Blue Hill Turnpike later continued.