Federal regulators are about to announce what they believe caused a bridge to collapse in Pittsburgh more than two years ago, sending vehicles plummeting into a ravine and injuring several people.
The National Transportation Safety Board is expected to vote Wednesday on the results of its investigation into the Jan. 28, 2022, collapse of the Forbes Avenue bridge over Fern Hollow Creek, as well as recommendations about how to prevent something similar from happening again.
In May, NTSB investigators said drainage problems on the steel bridge led to the deterioration of the structure’s metal legs and that necessary maintenance to clear debris, dirt and leaves had not occurred.
The 447-foot-long (136-meter) bridge’s collapse dropped a bus and four cars about 100 feet (30 meters) on the day President Joe Biden visited Pittsburgh to promote spending on infrastructure. Another vehicle drove off the east bridge abutment and landed on its roof.
A new bridge at the site opened to traffic in December 2022. The old bridge was about 50 years old when it collapsed and had been under a 26-ton (24,000 kilo) posted weight limit since 2014.
The collapse came hours before President Joe Biden arrived in the city to promote his $1 trillion infrastructure law, which has earmarked about $1.6 billion for Pennsylvania bridge maintenance.
At least four people required hospital treatment. Five other vehicles were also on the bridge at the time. The cause was being investigated, and crews searched under the debris for additional victims.
A large crack showed on the end of the bridge where the segmented bus landed 150 feet (46 meters) down in the ravine, as if hit by an earthquake. A car landed upside down in front of the bus, which was operated by the Pittsburgh area’s transit agency.
The Associated Press contributed to this article.