Lessons learned from the Tappan Zee Bridge, New York
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Lessons learned from the Tappan Zee Bridge, New York

Filetype[PDF-1.30 MB]

  • English

  • Details:

    • Resource Type:
    • Geographical Coverage:
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ;
    • Abstract:
      The Governor Malcolm E. Wilson Tappan Zee Bridge carries the New York Thruway's mainline across the Hudson River. The bridge showed signs of deterioration from the early 1990s. Damage due to increased traffic levels, chloride ion penetration in the concrete deck, and other environmental factors indicated that the bridge deck had outlived its design capacity and was in need of rehabilitation or replacement. Given the critical location and traffic volume on the Tappan Zee Bridge, conventional rehabilitation alternatives pose logistical problems for traffic detour. Between 1996 and 1998, the New York State Thruway Authority (NYSTA) replaced the entire deck of the 13 east deck truss spans and along the median of the west trestle spans between Piers 1 and 81. Two different types of precast deck units were used in these operations, Inverset and Exodermic. The Inverset and Exodermic systems are two precast deck units that can be used for rapid reconstruction or repair of bridge decks without disrupting traffic. The Inverset is a composite concrete deck on steel girders, while the Exodermic is a composite deck on a steel grid. The installation procedure of the deck is discussed in as much detail as required in this report to acquire a broad idea of the extent of the project. Several other details are, in most cases, very specific to this project and designed for this application. The choice of a precast deck type is case-specific. However, the lessons learned from the successful execution of this project are of great value to agencies that might consider similar projects. References, 27 figures, 1 table, 32 p.
    • Format:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at rosap.ntl.bts.gov

    Version 3.21