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Safety Recommendation Details

Safety Recommendation H-90-067
Details
Synopsis: ABOUT 8:15 P.M. CENTRAL STANDARD TIME, APRIL 1, 1989, AN 85. 5-FOOT SECTION OF THE 4,201-FOOT-LONG NORTHBOUND U.S. ROUTE 51 BRIDGE OVER THE HATCHIE RIVER FELL ABOUT 20 FEET INTO THE 24-FOOT-DEEP RAIN-SWOLLEN RIVER AFTER TWO PILE-SUPPORTED COLUMN BENTS SUPPORTING THREE BRIDGE SPANS COLLAPSED. WITNESS REPORTS AND PHYSICAL EVIDENCE INDICATE THAT THE SOUTHERN COLUMN BENT (70) AND THE TWO SPANS THAT IT SUPPORTED FELL QUICKLY, CAUSING FOUR PASSENGER CARS AND ONE TRACTOR-SEMITRAILER TO PLUNGE INTO THE RIVER. THE ADJACENT COLUMN BENT (71) AND THE SPAN THAT IT WAS SUPPORTING THEN COLLAPSED ON TOP OF THE VEHICLES. THE RIVER HAD APPARENTLY BEEN AT FLOOD STAGE SINCE NOVEMBER 1988. ALL EIGHT VEHICLE OCCUPANTS DIED AS A RESULT OF THE COLLAPSE. (COVINGTON, TENNESSEE)
Recommendation: THE NTSB RECOMMENDS THAT THE TENNESSEE DEPARTMENT OF TRANSPORTATION: ESTABLISH AN INTER-DISCIPLINARY TEAM OF GEOTECHNICAL, HYDRAULIC, AND STRUCTURAL ENGINEERS TO DEVELOP THE REPAIR AND REHABILITATION PROGRAMS FOR THOSE BRIDGES THAT ARE DETERMINED TO BE SCOUR-CRITICAL.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Highway
Location: Covington, TN, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA89MH006
Accident Reports: Collapse of the Northbound U.S. Route 51 Bridge Spans over the Hatchie River
Report #: HAR-90-01
Accident Date: 4/1/1989
Issue Date: 7/24/1990
Date Closed: 1/8/1993
Addressee(s) and Addressee Status: State of Tennessee, Department of Transportation (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: State of Tennessee, Department of Transportation
Date: 1/8/1993
Response: THE BOARD IS PLEASED TO LEARN THAT THE TDOT HAS RANKED THOSE BRIDGES THAT ARE SUSCEPTIBLE TO SCOUR & THAT IT USES CONSULTANT ENGINEERING FIRMS FOR THE HYDRAULIC ANALYSIS, SCOUR EVALUATION, & THE DEVELOPMENT OF REPAIR PLANS OF SCOUR CRITICAL BRIDGES. RECOMMENDATION H-90-67 HAS BEEN CLASSIFIED "CLOSED--ACCEPTABLE ACTION."

From: State of Tennessee, Department of Transportation
To: NTSB
Date: 9/14/1992
Response: TDOT HAS SCREENED AND RANKED BRIDGES WHICH ARE SCOUR SUSCEPTIBLE AND USES CONSULTANT ENGINEERING FIRM FOR THE HYDRAULIC ANALYSIS AND SCOUR EVALUATION OF THOSE BRIDGES FOR BOTH SYSTEM AND OFF-SYSTEM. THE CONSULTANTS DEVELOP REPAIR PLANS FOR SCOUR CRITICAL BRIDGES MAINTAINED BY THE STATE.

From: NTSB
To: State of Tennessee, Department of Transportation
Date: 6/12/1992
Response: