North Bank Pedestrian Bridge
Location: Boston & Cambridge, Massachusetts
Contract: MassDOT 60856
Project Dates: December 2009 - June 2012
The North Bank Bridge project provides a bicycle/pedestrian connection which links the North Point Park in East Cambridge to the Paul Revere Park in Charlestown. The Project also includes extensive hard and softscape work creating park and plaza open spaces.
The pedestrian bridge is a 12-foot wide, 700-ft long, steel sinusoidal bridge which spans the Millers River, the MBTA Commuter Rail tracks and the Duck Boat Ramp. Foundations for the bridge are made up of new 3 ft. diameter drilled shafts and retrofitting existing abandoned 5.5 ft. & 7 ft. diameter drilled shafts that remain from temporary structures that were installed and removed as a part of Boston’s Big Dig. On top of the drilled shafts are cast-in-place concrete footings, with architectural concrete columns and “U” shaped pier heads. The center span of the bridge rises to provide approximately 22 ft of clearance over the commuter rail tracks. The Bridge’s alignment has the structure starting under the Zakim Bridge, then being nestled between the MBTA’s Signal Tower A and the Storrow Drive Loop Ramps. The Bridge deck is made from FRP composite panels with lighting being provided by LED fixtures installed into the Bridge’s handrails. Missile Barrier fencing is also provided over the MBTA’s tracks.
Under the Leonard P. Zakim Bunker Hill Bridge, underbridge plazas are being constructed on both the North and South Banks of the Charles River. The plazas’ construction utilizes granite cobbles, concrete bands and pavers laid with intricate patterns. Also required is the complete reconstruction of approximately 150LF of Granite Block Seawall built upon precast concrete caps and planks supported by driven Steel H-Piles and Steel Sheet Piling driven in close proximity to the MBTA’s Orange Line Tunnel outside of the TD Banknorth Garden.
When complete, the park will contain waterfront esplanades, open space, and lighting to brighten the underbridge pedestrian areas on both the Boston and Cambridge sides of the river. The plazas will also be finished with benches and trash receptacles.
The Project also includes constructing park land connecting to the North Point Park in Cambridge, the Paul Revere Park in Charlestown and the future Charles River Conservancy SkatePark. The parks include trees, grass, and other plantings as well as paved walkways leading to and from the new North Bank Pedestrian Bridge and connecting to the Charles River Esplanade walks.