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Safety Recommendation Details

Safety Recommendation H-84-053
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: CHANGE THE FORMAT OF THE "BRIDGE INSPECTOR'S TRAINING MANUAL" TO PROVIDE FOR PAGE-CHANGE UPDATING, TO KEY THE MANUAL TO INSPECTION FORMS, TO PRESCRIBE MANDATORY EXAMINATIONS AND INSPECTOR EVALUATIONS OF INDIVIDUAL CRITICAL ELEMENTS AS WELL AS OVERALL CONDITIONS, AND TO DESCRIBE AN OPTIONAL METHODOLOGY FOR EFFECTIVE ON-SITE INSPECTION.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Unacceptable 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: 4/1/1988
Addressee(s) and Addressee Status: FHWA (Closed - Unacceptable Action)
Keyword(s): Bridge Inspection, Training and Education

Safety Recommendation History
From: NTSB
To: FHWA
Date: 4/1/1988
Response:

From: FHWA
To: NTSB
Date: 1/5/1988
Response: THESE RECOMMENDATIONS WERE ALL INCLUDED IN THE FHWA MANUAL, "INSPECTION OF FRACTURE CRITICAL BRIDGE MEMBERS," PUBLISHED IN SEPTEMBER 1986. WE BELIEVE THIS ACTION FULLY SATISFIES THE RECOMMENDATION. WE BELIEVE THIS ACTION FULLY SATISFIES

From: NTSB
To: FHWA
Date: 3/19/1987
Response:

From: FHWA
To: NTSB
Date: 11/7/1986
Response: THIS WILL BE INCLUDED IN THE SOON TO BE PUBLISHED, "INSPECTION OF FRACTURE CRITICAL BRIDGE MEMBERS."

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

From: FHWA
To: NTSB
Date: 11/9/1984
Response: FHWA LTR: THE BRIDGE INSPECTOR'S TRAINING MANUAL HAS BEEN PUNCHED FOR ASSEMBLY IN A THREE-HOLE RING BINDER SINCE IT WAS FIRST ISSUED IN 1970. THIS WAS DONE TO PERMIT ADDITIONS OR CORRECTIONS BY THE FHWA, STATES OR INDIVIDUAL INSPECTORS. THE NEW MANUAL, "INSPECTION OF FRACTURE CRITICAL BRIDGE MEMBERS," WILL CONTAIN GUIDANCE AND INSTRUCTIONS ON INSPECTION PROCEDURES AND EVALUATION OF FRACTURE CRITICAL BRIDGE DETAILS.