Nitsch Engineering provided land surveying and civil engineering services associated with the renovation of the Chelsea Street movable bridge over the Chelsea River between East Boston and Chelsea. Because the City of Boston was under an Order to Alter from the U.S. Coast Guard under provisions of the Truman-Hobbs Act, the existing 140-foot Straus-Heel Trunnion bascule span needed to be replaced with a 380-foot vertical lift span providing 175 feet of vertical clearance. These new clearances were deemed necessary to improve navigation on this critical channel.
Nitsch Engineering performed all civil engineering tasks related to reconstruction of Chelsea Street, a four lane urban arterial. We prepared contract documents for reconstruction of the roadway including plan, profile, utility relocations, drainage modifications, traffic control, and property easements. Nitsch Engineering also performed a highly detailed topographic survey of the Chelsea Street Bridge including the approaches from East Boston and Chelsea, and determined the existing right-of-way and U.S. Pier & Bulkhead line. We also performed survey monitoring for bridge sway, and used laser scanning to prepare an as-built of the new bridge to determine if the new rail systems conformed to design standards. Construction began in March 2009, and was completed in 2012.