Street Bridge and the newly opened Sumner Tunnel under a permit issued just two days prior. The bridge reopened on December 23, 1935, without streetcar tracks; the Eastern Mass continued its bus operations. The Boston Elevated Railway began Chelsea Square– bus service over the bridge on July 2, 1936. Construction and financing The new bridge was originally operated by the Mystic River Bridge Authority. The bridge, according to the statute enacted May 23, 1946, would be turned over to the Massachusetts Department of Public Works once the $27 million in bonds used to finance the bridge's construction was retired. The bridge would then become part of the state highway system to be maintained and operated by the department free of tolls. Operation of the bridge was turned over to the new Massachusetts Port Authority in 1956. The Chelsea Bridge originally remained intact; the southern section remained open as truck access to Mystic Wharf, while the northern section was closed to traffic but still carried a water main across the Mystic River. State funding for a replacement water tunnel was approved in August 1950. On January 28, 1951, six people in a wedding party died when they drove onto the Charlestown end of the closed bridge and fell into the river at the open north draw. The north draw and the north section of the viaduct were removed in 1954. A new street, Terminal Street, opened on August 21, 1956, to serve the Mystic Wharf; the old south draw was closed at that time and soon removed. A new fixed bridge was built near the alignment of the former south draw in 1982 as part of a project to remove trucks from neighborhood streets in Charlestown. It provides only clearance above the water, as the only vessels using the Little Mystic Channel were recreational boats using a 1970s-built boat ramp. Later events In 1967, the Mystic River Bridge was renamed in honor of Maurice J. Tobin, former Boston mayor and Massachusetts governor. Construction of the bridge began during his term as governor (1945–1947). Tobin went on to serve as Secretary of Labor under President Harry Truman before he died in 1953. Instead of eliminating the tolls, the southbound tolls were increased to 25 cents to cover the closing of the Northbound toll plaza in the 1980s. Starting in the early 1990s the tolls increased sharply to help pay for the Big