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Zakim Bridge

Zakim Bunker Hill Bridge
Leonard P. Zakim Bunker Hill Bridge - Boston, MA crop.jpg
(2005)
Coordinates 42°22′08″N 71°03′48″W / 42.36889°N 71.06333°W / 42.36889; -71.06333Coordinates: 42°22′08″N 71°03′48″W / 42.36889°N 71.06333°W / 42.36889; -71.06333
Carries 10 lanes of I‑93 / US 1
Crosses Charles River, MBTA Orange Line
Locale Boston, Massachusetts
Official name Leonard P. Zakim Bunker Hill Memorial Bridge
Owner Commonwealth of Massachusetts
Maintained by Massachusetts Department of Transportation
Characteristics
Design Hybrid Steel and Concrete Cable-stayed bridge
Total length 1,432 ft (436 m)
Width 183 ft (56 m)
Height 270 ft (82 m)
Longest span 745 ft (227 m)
Clearance below 40 ft (12 m)
History
Construction cost $105 million
Opened March 30, 2003 (northbound)
December 20, 2003 (southbound)
Leonard P. Zakim Bunker Hill Memorial Bridge is located in Massachusetts
Leonard P. Zakim Bunker Hill Memorial Bridge
Leonard P. Zakim Bunker Hill Memorial Bridge (Massachusetts)

The Leonard P. Zakim (/ˈzkəm/) Bunker Hill Memorial Bridge (or Zakim Bridge) is a cable-stayed bridge across the Charles River in Boston, Massachusetts. It is a replacement for the Charlestown High Bridge, an older truss bridge constructed in the 1950s. Of ten lanes, using the harp-style system of nearly-parallel cable layout, coupled with the use of "cradles" through each pylon for the cables, the main portion of the Zakim Bridge carries four lanes each way (northbound and southbound) of the Interstate 93 and U.S. Route 1 concurrency between the Thomas P. "Tip" O'Neill Jr. Tunnel and the elevated highway to the north. Two additional lanes are cantilevered outside the cables, which carry northbound traffic from the Sumner Tunnel and North End on-ramp. These lanes merge with the main highway north of the bridge. I-93 heads toward New Hampshire as the "Northern Expressway", and US 1 splits from the Interstate and travels northeast toward Massachusetts' North Shore communities, crossing the Mystic River via the Tobin Bridge.


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