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Safety Recommendation Details

Safety Recommendation H-84-040
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: DEVELOP A DETAILED AND COMPREHENSIVE INTEGRATED BRIDGE INSPECTION PROCEDURE USING ALL AVAILABLE SOURCE MATERIALS, INCLUDING BUT NOT LIMITED TO THE FEDERAL HIGHWAY ADMINISTRATION'S "BRIDGE INSPECTOR'S TRAINING MANUAL" AND THE AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS' "MANUAL FOR BRIDGE MAINTENANCE (1976)" AND "MANUAL FOR MAINTENANCE INSPECTION OF BRIDGES (1978)."
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: 4/1/1988
Addressee(s) and Addressee Status: FHWA (Closed - Acceptable Action)
Keyword(s):

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

From: FHWA
To: NTSB
Date: 1/5/1988
Response: COMPLETION OF THESE RECOMMENDATIONS IS DEPENDENT ON THE PUBLICATION OF TWO MANUALS: (1) "INSPECTION OF FRACTURE CRITICAL BRIDGE MEMBERS" (2) "CULVERT INSPECTOR'S TRAINING MANUAL." THE FIRST MANUAL WAS PUBLISHED IN SEPT. 1986 AND THE SECOND MANUAL WAS PUBLISHED IN JULY 1986. BOTH MANUALS ARE BEING USED IN TRAINING COURSES FOR BRIDGE INSPECTORS DEVELOPED BY THE NATIONAL HIGHWAY INSTITUTE FOR FHWA. WE BELIEVE THESE ACTIONS FULLY SATISFY THESE RECOMMENDATIONS.

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

From: FHWA
To: NTSB
Date: 11/7/1986
Response: COMPLETION OF THESE RECOMMENDATIONS IS DEPENDENT ON THE PUBLICATION OF TWO MANUALS: (1) "INSPECTION OF FRACTURE CRITICAL BRIDGE MEMBERS" AND, (2) "CULVERT INSPECTOR'S TRAINING MANUAL." THE FIRST MANUAL IS IN THE FINAL REVIEW STAGE AND SHOULD BE PUBLISHED IN THE NEAR FUTURE. ATTACHED IS A COURSE ANNOUNCEMENT FOR THE FRACTURE CRITICAL BRIDGE MEMBER INSPECTION COURSE.

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 CONTAINS VERY DETAILED INSPECTION PROCEDURES FOR NEARLY ALL BRIDGE TYPES COMMONLY IN EXISTENCE. THE PROCEDURES DESCRIBED ARE SOMEWHAT GENERALIZED IN NATURE AS THEY MUST BE TO COVER THE MULTITUDE OF BRIDGE TYPES AND VARIED DETAILS OF DESIGN AND CONSTRUCTION USED BY THE STATES. IN GENERAL, EACH STATE MUST PREPARE ADDITIONAL SPECIFIC PROCEDURES WHICH MAY BE NECESSARY AS THE RESULT OF UNUSUAL BRIDGES PECULIAR TO THEIR STATE. HOWEVER, THE FHWA DOES HAVE UNDER DEVELOPMENT TWO SUPPLEMENTS TO THE BRIDGE INSPECTOR'S TRAINING MANUAL. THE FIRST, "INSPECTION OF FRACTURE CRITICAL BRIDGE MEMBERS," AND A COMPANION TRAINING COURSE WILL BE MADE AVAILABLE TO ALL STATES TO ENHANCE THEIR INSPECTION SKILLS AND TO EMPHASIZE THE SPECIAL CARE WHICH MUST BE TAKEN TO INSPECT AND ENSURE THE SAFETY OF BRIDGES WITH FRACTURE CRITICAL DETAILS. THE SECOND MANUAL AND A COMPANION TRAINING COURSE WILL COVER "INSPECTION OF LONG SPAN CULVERTS." THIS SUPPLEMENT WILL ADDRESS THE INSPECTION AND EVALUATION OF A PARTICULAR STRUCTURE TYPE FOR WHICH, TO OUR KNOWLEDGE, NO GUIDANCE HAS BEEN ISSUED TO DATE. THESE EFFORTS SHOULD MEET THE NEEDS OF THE STATES AND EMBODY THE ELEMENTS OF THE NTSB RECOMMENDATIONS.