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Safety Recommendation Details

Safety Recommendation H-84-043
Details
Synopsis: ON JUNE 28, 1983, A 100-FOOT-LONG SUSPENDED SPAN BETWEEN PIERS 20 AND 21 OF THE EASTBOUND TRAFFIC LANES OF THE INTERSTATE ROUTE 95 HIGHWAY BRIDGE OVER THE MIANUS RIVER IN GREENWICH, CONNECTICUT, COLLAPSED AND FELL 70 FEET INTO THE RIVER BELOW. TWO TRACTOR-SEMITRAILERS AND TWO AUTOMOBILES PLUNGED INTO THE VOID IN THE BRIDGE AND WERE DESTROYED BY IMPACT FROM THE FALL. THREE VEHICLE OCCUPANTS DIED, AND THE OTHER THREE RECEIVED SERIOUS INJURIES. THE NATIONAL TRANSPORTATION SAFETY BOARD DETERMINED THAT THE PROBABLE CAUSE OF THE COLLAPSE OF THE MIANUS RIVER BRIDGE SPAN WAS THE UNDETECTED LATERAL DISPLACEMENT OF THE HANGERS OF THE PIN AND HANGER SUSPENSION ASSEMBLY IN THE SOUTHEAST CORNER OF THE SPAN BY CORROSION-INDUCED FORCES DUE TO DEFICIENCIES IN THE STATE OF CONNECTICUT'S BRIDGE SAFETY INSPECTION AND BRIDGE MAINTENANCE PROGRAM.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL HIGHWAY ADMINISTRATION: ESTABLISH A BRIDGE INSPECTION ENFORCEMENT PROGRAM THAT WILL ASSURE COMPLIANCE WITH 23 CFR 650.303 AMENDED AS RECOMMENDED BY THE SAFETY BOARD.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Highway
Location: Mianus River, Greenwich, CT, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA83AH003
Accident Reports: Collapse of a Suspended Span of Inter- state Route 95 Highway Bridge over the Mianus River
Report #: HAR-84-03
Accident Date: 6/28/1983
Issue Date: 7/19/1984
Date Closed: 3/19/1987
Addressee(s) and Addressee Status: FHWA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FHWA
Date: 3/19/1987
Response:

From: FHWA
To: NTSB
Date: 11/7/1986
Response: ON MAY 14, 1985, THE FHWA EXECUTIVE DIRECTOR, RICHARD MORGAN, DISTRIBUTED A MEMORANDUM TO OUR FIELD OFFICES WHICH EMPHASIZED THE IMPORTANCE OF COMPLYING WITH THE NATIONAL BRIDGE INSPECTION STANDARDS, ESPECIALLY IN THE AREA OF FREQUENCY OF INSPECTION AND LOAD POSTING OF BRIDGES. IN THOSE STATES OR LOCAL JURISDICTIONS WHERE SUBSTANTIAL NBIS DEFICIENCIES ARE CONFIRMED, THE STATE IS TO BE NOTIFIED THAT TO AVOID SUSPENSION OF FEDERAL-AID IN THE JURISDICTION INVOLVED, ONE OF THE FOLLOWING ACTIONS IS REQUIRED: (1) CORRECTION OF NBIS DEFICIENCIES, OR (2) SUBMISSION, FOR APPROVAL BY FHWA, OF AN AGGRESSIVE, SHORT-TERM PLAN TO CORRECT NBIS DEFICIENCIES.

From: NTSB
To: FHWA
Date: 6/10/1985
Response:

From: FHWA
To: NTSB
Date: 11/9/1984
Response: FHWA LTR: THE FHWA INCLUDED THE ENFORCEMENT OF THE NATIONAL BRIDGE INSPECTION STANDARDS (NBIS) AS A SPECIAL AREA OF PROGRAM EMPHASIS FOR THE LAST 2 FISCAL YEARS. A COMPREHENSIVE REVIEW OF THE PROGRAM IS UNDERWAY AND OPTIONS AND RECOMMENDATIONS FOR IMPROVING EFFECTIVENESS WILL BE GIVEN TO THE EXECUTIVE DIRECTOR OF THE FHWA EARLY IN 1985. THESE ACTIONS SHOULD RESULT IN IMPROVED COMPLIANCE WITH THE NBIS.