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Safety Recommendation Details

Safety Recommendation H-84-041
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: AMEND 23 CFR 650.303 TO INCLUDE AN INTEGRATED BRIDGE INSPECTION PROCEDURE IN ITS ENTIRETY OR TO INCORPORATE SUCH A PROCEDURE BY REFERENCE.
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: 7/27/1989
Addressee(s) and Addressee Status: FHWA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FHWA
Date: 7/27/1989
Response:

From: FHWA
To: NTSB
Date: 5/11/1989
Response: WE BELIEVE THE REVISED NATIONAL BRIDGE INSPECTION STANDARDS, EFFECTIVE OCTOBER 25, 1988, AND FEDERAL-AID HIGHWAY PROGRAM MANUAL 6-7-2-1, EFFECTIVE FEBRUARY 21, 1989 (COPIES ENCLOSED) ADDRESS SAFETY RECOMMENDATIONS H-84-41,-46,-47. WE RESPECTFULLY REQUEST THESE RECOMMENDATIONS BE CLOSED.

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

From: FHWA
To: NTSB
Date: 11/7/1986
Response: THE UPDATE OF THE NATIONAL BRIDGE INSPECTION STANDARDS IS BEING PREPARED AND SHOULD BE IN THE FEDERAL REGISTER IN THE NEAR FUTURE. THE NEW MANUALS DISCUSSED IN H-84-40 WILL BE REFERENCED IN THE CHANGES.

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

From: FHWA
To: NTSB
Date: 11/9/1984
Response: FHWA LTR: THE FHWA ANTICIPATES UPDATING 23 CFR 650.303 IN 1985. THE NEW MANUALS DISCUSSED IN H-84-40 WOULD BE REFERENCED IN THE CHANGES.