C&C Consulting Engineers is currently serving on a team selected by the Massachusetts Department of Conservation and Recreation (DCR) to oversee the rehabilitation of the historic Longfellow Bridge over the Charles River in downtown Boston and Cambridge, Massachusetts. Our work has involved structural engineering for a two-span approach section over Memorial Drive on the Cambridge side of the river as well as traffic engineering for the entire project.
This majestic bridge, built by the Boston Transit Commission and opened to the public on August 3, 1906, to extend trolley car service from Boston to Cambridge, is well known for its four “salt and pepper shaker” towers flanking the main span of the bridge. Today, the unique structure is a protected historic landmark in the Boston Metropolitan region.
Over the years, the structure has been strengthened to carry two tracks for the MBTA Red Line in the center of the column-support deck. Two roadway lanes and a sidewalk flank each side of the rail corridor. The largest challenges of the project were to maintain acceptable levels of service for the roadway and to maintain full Red Line service for the 90,000+ commuters who use it daily.
In September 2007, C&C was asked to conduct an emergency in-depth bridge inspection and rating of three spans of arch structures and two spans of steel girder structures near the Cambridge side of the bridge. Following the inspection, our engineers performed bridge rating analysis of the spans and made recommendations for emergency repairs.