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Safety Recommendation Details

Safety Recommendation H-88-012
Details
Synopsis: ON APRIL 5, 1987, TWO OF THE FIVE SPANS OF THE NEW YORK STATE THRUWAY (I-90) BRIDGE OVER THE SCHOHARIE CREEK FELL ABOUT 80 FEET INTO A RAIN-SWOLLEN CREEK AFTER PIER 3, WHICH PARTIALLY SUPPORTED THE TWO SPANS, COLLAPSED. NINETY MINUTES AFTER THE INITIAL COLLAPSE, PIER 2 AND A THIRD SPAN COLLAPSED. FOUR PASSENGER CARS AND ONE TRACTOR-SEMITRAILER PLUNGED INTO THE CREEK, AND 10 PERSONS WERE FATALLY INJURED.
Recommendation: THE NTSB RECOMMENDS THAT THE AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS: REVISE SECTION 4.4.2.1 OF THE STANDARD SPECIFICATIONS FOR HIGHWAY BRIDGES REMOVING ANY REFERENCE TO A MINIMUM DEPTH OF 4 TO 6 FEET FOR BRIDGES OVER WATER AND STATING INSTEAD THAT THE MINIMUM DEPTH OF FOOTING BE BASED ON HISTORICAL DATA FOR SCOUR AT OR NEAR THE BRIDGE SITE AND MATHEMATICAL ANALYSES OF MAXIMUM POTENTIAL SCOUR DEPTH.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Highway
Location: Amsterdam, NY, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA87MH005
Accident Reports: Collapse of New York Thruway (I-90) Bridge over the Schoharie Creek
Report #: HAR-88-02
Accident Date: 4/5/1987
Issue Date: 6/8/1988
Date Closed: 5/12/1992
Addressee(s) and Addressee Status: American Association of State Highway and Transportation Officials (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: American Association of State Highway and Transportation Officials
Date: 5/12/1992
Response: The Safety Board understands that the AASHTO has recently rewritten Section 4, removing any reference to a minimum depth of 4 to 6 feet for footings of bridges and requiring that the depth of piles exceed the predicted maximum potential depth of scour. Consequently, Safety Recommendations H-88-12 and -13 have been classified as "Closed--Acceptable Action."

From: American Association of State Highway and Transportation Officials
To: NTSB
Date: 1/2/1992
Response: BASED UPON RECOMMENDATIONS OF THE TECHNICAL COMMITTEE ON SUBSTRUCTURES AND RETAINING WALLS, A COMPLETE REWRITE OF SECTION 4 WAS UNDERTAKEN. THE NEW SECTIONS 4.2.1, 4.3.5. 4.4.5, 4.5.7.5, 4.6.5.6.1.3., AND 7.3.2.3 INCLUDE CONSIDERABLE REQUIREMENTS ON SCOUR.

From: NTSB
To: American Association of State Highway and Transportation Officials
Date: 8/19/1988
Response: The Safety Board is pleased to learn that the two recommendations have been referred to the AASHTO Highway Subcommittee on Bridges and Structures. Pending a further response, Safety Recommendations H-88-12 and -13 have been classified as "Open--Acceptable Action."

From: American Association of State Highway and Transportation Officials
To: NTSB
Date: 8/2/1988
Response: RECOMMENDATIONS H-88-12 AND -13 HAVE BEEN REFERRED TO THE HIGHWAY SUBCOMMITTEE ON BRIDGES AND STRUCTURES, WHICH IS THE TECHNICAL BODY WITHIN AASHTO RESPONSIBLE FOR MAINTENANCE AND UPKEEP OF STANDARD SPECIFICATIONS FOR HIGHWAY BRIDGES.