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About the Tobin Bridge
Tobin by the Numbers

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About the Tobin Bridge
Tobin Bridge 24-hour Hot Line
(617) 241-2010

Tobin Bridge Administration
(617) 242-7979

Tobin Bridge Photo - Click for Enlargement/Description
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The Tobin Memorial Bridge was erected in 1948-49 and opened to traffic in 1950. It connects the Charlestown section of Boston with Chelsea. The bridge provides three travel lanes northbound on its lower level and three lanes southbound on the upper level. Tolls are collected from southbound cars only. The 36-foot-wide roadway is bounded on both sides by safety walks (2'7" wide) with steel-pipe railings on each side.

The main structure over the Mystic River is a three-span, cantilevered truss 1,525' in length. Its center span is 800' and the maximum truss height is 115'. It provides a navigable waterway opening 700' wide by 135' high. A smaller, simply supported warren truss spans the Little Mystic. It reaches a maximum truss height of 65' and is 439' long. Its navigable waterway opening measures 340' wide by 100' high.

The approaches comprise 36 spans on the north and 32 spans on the south. These spans are built-up plate girders of variable lengths (average length is 100'). On the twelve-span toll plaza--set between the Little and Big Mystic trusses--the roadway widens to102 feet to accommodate seven collection lanes.

Recently rehabilitated, the toll plaza sits on the upper level and incorporates such features as a walkway across its top (for electrical maintenance), new heated and air-conditioned booths, an overhead electronic message board and a fire-suppression system.

A maintenance garage, located in Chelsea, houses all maintenance, operating, and mechanical equipment for upkeep of the bridge. Including north and south approaches, the bridge is approximately 2 1/4 miles long.

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