Another replacement of the north draw span began in early 1912, with the temporary bridge completed that August. The new steel truss swing span – claimed to be the largest bridge span in New England – opened on May 28, 1913. The span rotated on 64 wheels on a diameter circular rail. It was long and wide, and could rotate to provide two -wide channels large enough for oceangoing ships. As part of the $425,000 project (), the wooden pile approaches were raised to eliminate a slope from the Charlestown viaduct.