page_title: Leonard P. Zakim Bunker Hill Memorial Bridge
section_title: Landscape design and public art
hierarchical_section_title: Leonard P. Zakim Bunker Hill Memorial Bridge / Landscape design and public art
caption_attribution_description: English: lighting sculptures under Zakim Bridge, Boston, Massachusetts.
context_page_description: The Leonard P. Zakim Bunker Hill Memorial Bridge is a cable-stayed bridge completed in 2003 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 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.
  The bridge and connecting tunnel were built as part of the Big Dig, the largest highway construction project in the United States.
context_section_description: Placement of footings for the Zakim Bridge required environmental permits to relocate areas of open water surface, changing the contour of the Charles River shoreline. The process of landscape design and environmental mitigation under the bridge deck and around the bridge supports allowed for the creation of a new and accessible public landscape designed by Carol R. Johnson Associates. This under bridge landscape contains a series of perforated stainless steel lighting-based public artworks, entitled, Five Beacons for the Lost Half Mile.
  Pedestrians and cyclists are able to travel from Charlestown toward Cambridge over the adjacent North Bank Pedestrian Bridge to North Point Park. This bridge is a link in the Charles River Bike Path.
caption: Under Zakim Bridge, Five Beacons for the Lost Half Mile, blue phase
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