Brooklyn Bridge
Rehabilitation
Restoring a 140 year old National Historic Landmark across two boroughs while keeping 120,000 vehicles a day moving and New York City's busiest pedestrian and cyclist promenade open every day of construction.
A National Historic Landmark, restored without ever closing
The Brooklyn Bridge is a long span suspension bridge across the East River, designated a New York City Landmark in 1967 and a National Historic Landmark in 1964. Under NYCDOT Contract BRC270D, the Navillus / MLJ Joint Venture is delivering a comprehensive rehabilitation of the bridge's masonry towers and approach arches across the boroughs of Manhattan and Brooklyn. The scope spans heavy structural strengthening, foundation underpinning beneath the live structure, and large scale historic masonry restoration, all executed without disrupting the bridge's role as a critical artery for vehicles, cyclists, and pedestrians.
Key project data at a glance
Engineering, preservation, and public safety, all at the same time
Underpinning Beneath an Active Suspension Bridge
The Manhattan Approach Arch foundations needed to be strengthened by jet grouting beneath an in service masonry bridge carrying approximately 120,000 vehicles a day, with no tolerance for settlement, vibration, or damage to the historic fabric above.
A pre qualified specialty subcontractor was engaged under NYCDOT's enhanced minimum qualifications. The team executed a Field Demonstration Test Program before any production work, instrumented the arch blocks with continuous movement detection monitoring, and sequenced perimeter columns first so the foundations remained continuously supported as interior columns were drilled. Performance specifications: 250 psi minimum UCS, plus or minus 2 degrees tolerance, columns 60 inches or less in width.
Restoring Masonry to 1880s Standards
Approximately 512,500 square feet of historic granite and brick spanning the Manhattan and Brooklyn towers and the approach arches required restoration to a standard acceptable to both the NYC Landmarks Preservation Commission and the National Park Service. Every mortar joint, tooling pattern, and stone color had to match the 1880s original.
Navillus deployed experienced historic masonry crews and a dedicated preservation QC lead. Full scale mockups of repointing, granite Dutchman repairs, brick replacement, and Compatible Injected Fill (CIF) injection were built and approved by NYCDOT, LPC, and NPS before any production work began. The CIF mix was designed and certified by a registered Professional Engineer.
Operating Over 120,000 Vehicles a Day
The Brooklyn Bridge cannot close. With approximately 120,000 vehicles daily and the busiest pedestrian and cyclist promenade in New York City, every phase of work had to keep traffic and the promenade fully operational, with overhead protection and zero tolerance for falling debris.
The team developed a phased night and weekend work plan in coordination with NYCDOT's Traffic Management Center, with overhead protective canopies above the promenade, partial localized lane closures only, and overnight pours and picks scheduled during pre approved 9 PM to 5 AM windows. Suspended scaffolds with debris netting and full perimeter shrouds protected the public throughout.
Two Boroughs, No Land Side Staging
Simultaneous work fronts on the Manhattan and Brooklyn approaches, with no usable land side staging on either side, no room to lay down materials, and an aggressive 1,260 day schedule with $7,000 per day liquidated damages plus supplemental traffic, worker protection, and environmental LDs.
Material laydown was just in time, with deliveries via the bridge entrance ramps and a dedicated marine side rigging platform on a construction barge mobilized at the Manhattan Tower. Self perform crews (concrete, masonry, carpentry, ironwork) interlocked with specialty subs (jet grout, CIF, hazmat, marine, structural steel) on a tightly coordinated dual borough schedule.
Pioneering techniques that meet preservation standards
The project required engineering approaches rarely deployed beneath a working National Historic Landmark, each developed in coordination with NYCDOT, the Landmarks Preservation Commission, and the National Park Service.
- Performance spec jet grouting underpinning beneath an in service suspension bridge, with continuous instrumentation and perimeter first column sequencing to prevent any settlement of historic fabric
- Compatible Injected Fill (CIF) injection restoring structural continuity in delaminated brick wythes without removing or replacing the original outer face (30,000 SF)
- Custom 5,000 psi structural lightweight concrete using ASTM C330 lightweight aggregate, adding capacity to the arch blocks without adding mass to the suspended structure
- Tie rod strengthening at 660 locations, plus 56 permanent grouted reinforcing bars in the tower tops verified by full performance testing
- Custom temporary works including a barge mounted rigging platform at the Manhattan Tower and removable stainless anchors set into the granite face
Three 2025 awards for the Brooklyn Bridge rehabilitation
Awarded for the Brooklyn Bridge Rehabilitation Project, delivered by Navillus as part of a joint venture with MLJ Contracting LLC under NYCDOT Contract BRC270D.
Restoring an American icon for its next century of service
The Brooklyn Bridge has carried New Yorkers across the East River since 1883. NYCDOT Contract BRC270D extends its life as both a National Historic Landmark and a working artery, with structural strengthening, foundation underpinning, and historic masonry restoration delivered to the standards of the NYC Landmarks Preservation Commission and the National Park Service.