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Aug. 2 (Bloomberg) -- Workers were repairing corroded joints on Minnesota's busiest bridge when it collapsed into the Mississippi River yesterday, killing at least four people and leaving more than 20 missing, state officials said.
``A bridge in America shouldn't just fall down,'' U.S. Senator Amy Klobuchar, a Minnesota Democrat, said today at a news conference. ``We have to get to the bottom of this.''
As many as 50 cars plunged into the river along with the six-story structure, authorities and eyewitnesses said. Divers are focusing on recovery rather than rescue, Minneapolis Fire Chief James Clack said. About 80 people were hurt.
Concerns about the eight-lane Interstate 35W bridge, which connects downtown Minneapolis to its northern suburbs, are longstanding. Corroded bearings and steel joints have been a problem since 1990, said Khani Sahebjam, state transport engineer.
Crews were patching the road yesterday and working on the 40-year-old bridge's joints as part of a $9 million project.
The bridge carried about 140,000 vehicles a day. Two years ago, it was deemed ``structurally deficient,'' scoring four on a scale in which nine is the best. Engineers noted fatigue cracks.
``There was no call by anyone that it should be closed,'' said Governor Tim Pawlenty, a Republican. He ordered an immediate inspection today of all similarly designed bridges in Minnesota.
Forensic Engineers
The state also hired forensic engineers Wiss, Janney, Elstner Associates to probe the collapse, he said. The same firm investigated problems in Boston's Big Dig highway tunnel project.
About 8 percent of Minnesota's bridges are ``structurally deficient,'' the state's Transportation Department said. About a quarter of the nation's 595,363 bridges have similar or worse ratings, according to the American Society of Civil Engineers.
``Structurally deficient'' means a bridge should eventually be replaced and is safe for travel, Minnesota transportation officials said.
The bridge collapse was the worst outside of ship- or earthquake-caused events since a 1983 failure on Interstate 95 in Connecticut, U.S. Transportation Secretary Mary Peters said.
Peters late today asked the Department of Transportation to review the National Bridge Inspection Program, saying the incident in Minnesota is ``unacceptable,'' according to an e- mailed statement. In an earlier letter, she urged all states to immediately inspect the 756 other similar steel deck truss bridges in the country.
Towering Span
The I-35 bridge buckled during bumper-to-bumper traffic in the early evening rush hour yesterday.
Minneapolis Police Chief Tim Dolan said the river is about 8 feet (2.5 meters) deep below the bridge. He said emergency workers located ``several'' victims pinned in the wreckage.
``It is still a tremendously dangerous scene,'' he said at the news conference. Dolan said the FBI is involved in the investigation.
Peters promised $5 million to rebuild the bridge in an effort that may take one to two years. U.S. House Transportation Committee Chairman James Oberstar, a Minnesota Democrat, said he will ask Congress for an additional $250 million in emergency relief for Minnesota.
Nancy Pelosi, speaker of the House of Representatives, will pass emergency legislation this week to provide $250 million for bridge repair. Senate Majority Leader Harry Reid said the Senate would consider the measure afterward.
``The Senate leadership stands together with Senator Amy Klobuchar and the entire Minnesota delegation, and will help Minneapolis get everything it needs in the aftermath of yesterday's tragedy,'' Reid said.
Year-Long Probe
The National Transportation Safety Board, which sent 19 people to the scene, said the agency's investigation will take about a year.
The loss of the bridge, which carries commercial vehicles and commuters, will have an economic impact, U.S. Senator Norm Coleman, a Minnesota Republican, said in an interview.
``It has a potential to be a great disruption,'' he said.
President George W. Bush said he will visit Minneapolis on Aug. 4.
The bridge near the University of Minnesota and the Metrodome stadium, where the Minnesota Twins baseball team played last night, stretched almost 2,000 feet. Three of its four sections gave way, collapsing into the water and onto a freight train on riverside tracks.
Freight Shipments
U.S. grain and freight shipments on the river probably won't be disrupted by the collapse because most cargo is loaded downstream, traders and a U.S. Coast Guard spokesman said. The railroad affected operates only in Minnesota.
A March 2001 study by the state's transport agency found that the approach spans ``exhibited several fatigue problems, primarily due to unanticipated out-of-plane distortion of the girders. Concern about fatigue cracking in the deck truss is heightened by a lack of redundancy in the main truss system.''
The agency recommended that the deck be replaced by 2020 or beyond, Pawlenty said.
``We thought we had done all we could,'' Minnesota bridge inspector Dan Dorgan said. ``Obviously, something went terribly wrong.''