I-35W Highway Collapse
Collapse of I-35W Highway Bridge
Minneapolis, Minnesota
August 1, 2007
highway
ACCIDENT REPORT
National
Transportation
Safety Board
NTSB/HAR-08/03
PB2008-916203
NTSB/HAR-08/03
PB2008-916203
Notation 7975C
November 14, 2008
Highway Accident Report
Collapse of I-35W Highway Bridge
Minneapolis, Minnesota
August 1, 2007
National
Transportation
Safety Board
490 L’Enfant Plaza, S.W.
Washington, D.C. 20594
National Transportation Safety
Minneapolis, Minnesota, August
Washington, DC.
Board. 2008. Collapse of I-35W Highway Bridge,
1, 2007. Highway Accident Report NTSB/HAR-08/03.
Abstract: About 6:05 p.m. central daylight time on Wednesday, August 1, 2007, the eight-lane,
1,907-foot-long I-35W highway …show more content…
As a result, 1,000 feet of the deck truss collapsed, with about 456 feet of the main span falling 108 feet into the 15-foot-deep river. A total of 111 vehicles were on the portion of the bridge that collapsed. Of these, 17 were recovered from the water. As a result of the bridge collapse, 13 people died, and 145 people were injured. On the day of the collapse, roadway work was underway on the I-35W bridge, and four of the eight travel lanes (two outside lanes northbound and two inside lanes southbound) were closed to traffic. In the early afternoon, construction equipment and construction aggregates (sand and gravel for making concrete) were delivered and positioned in the two closed inside southbound lanes. The equipment and aggregates, which were being staged for a concrete pour of the southbound lanes that was to begin about 7:00 p.m., were positioned toward the south end of the center section of the deck truss portion of the bridge and were in place by about 2:30 p.m. …show more content…
The ratings are based on materials, physical condition of the deck, superstructure, and substructure. General condition ratings range from 0 (failed condition) to 9 (excellent). Based on the bridge’s condition, a status is assigned.
The status is used to determine eligibility for Federal bridge replacement and rehabilitation funding. Current Federal Highway Administration status ratings are Not Deficient, Structurally Deficient, and Functionally Obsolete.
Culvert: A drain, pipe, or channel that allows water to pass under a road, railroad, or embankment.
Dead load: The static load imposed by the weight of materials that make up the bridge structure itself.
Deck: The roadway portion of a bridge, including shoulders. Most bridge decks are constructed as reinforced concrete slabs.
Deck truss bridge: A truss bridge with the truss underneath the roadway, supporting traffic traveling along the top of the main structure. In a through truss, traffic travels through the superstructure, which is cross-braced above and below traffic.
Through truss
Deck truss
National Transportation Safety
Minneapolis, Minnesota
August 1, 2007
highway
ACCIDENT REPORT
National
Transportation
Safety Board
NTSB/HAR-08/03
PB2008-916203
NTSB/HAR-08/03
PB2008-916203
Notation 7975C
November 14, 2008
Highway Accident Report
Collapse of I-35W Highway Bridge
Minneapolis, Minnesota
August 1, 2007
National
Transportation
Safety Board
490 L’Enfant Plaza, S.W.
Washington, D.C. 20594
National Transportation Safety
Minneapolis, Minnesota, August
Washington, DC.
Board. 2008. Collapse of I-35W Highway Bridge,
1, 2007. Highway Accident Report NTSB/HAR-08/03.
Abstract: About 6:05 p.m. central daylight time on Wednesday, August 1, 2007, the eight-lane,
1,907-foot-long I-35W highway …show more content…
As a result, 1,000 feet of the deck truss collapsed, with about 456 feet of the main span falling 108 feet into the 15-foot-deep river. A total of 111 vehicles were on the portion of the bridge that collapsed. Of these, 17 were recovered from the water. As a result of the bridge collapse, 13 people died, and 145 people were injured. On the day of the collapse, roadway work was underway on the I-35W bridge, and four of the eight travel lanes (two outside lanes northbound and two inside lanes southbound) were closed to traffic. In the early afternoon, construction equipment and construction aggregates (sand and gravel for making concrete) were delivered and positioned in the two closed inside southbound lanes. The equipment and aggregates, which were being staged for a concrete pour of the southbound lanes that was to begin about 7:00 p.m., were positioned toward the south end of the center section of the deck truss portion of the bridge and were in place by about 2:30 p.m. …show more content…
The ratings are based on materials, physical condition of the deck, superstructure, and substructure. General condition ratings range from 0 (failed condition) to 9 (excellent). Based on the bridge’s condition, a status is assigned.
The status is used to determine eligibility for Federal bridge replacement and rehabilitation funding. Current Federal Highway Administration status ratings are Not Deficient, Structurally Deficient, and Functionally Obsolete.
Culvert: A drain, pipe, or channel that allows water to pass under a road, railroad, or embankment.
Dead load: The static load imposed by the weight of materials that make up the bridge structure itself.
Deck: The roadway portion of a bridge, including shoulders. Most bridge decks are constructed as reinforced concrete slabs.
Deck truss bridge: A truss bridge with the truss underneath the roadway, supporting traffic traveling along the top of the main structure. In a through truss, traffic travels through the superstructure, which is cross-braced above and below traffic.
Through truss
Deck truss
National Transportation Safety