New Thurmond Lake bridge monitored for movement

Equipment will monitor projectunder construction on U.S. 378

Tuesday, Feb. 7, 2012 3:04 PM
Last updated 9:36 PM
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Monitoring equipment is being installed to determine whether part of a bridge under construction on U.S. Highway 378 over the Savannah River is moving.

The $17.4 million project is about seven miles east of Lincoln­ton, Ga., on the highway that crosses Thurmond Lake into McCormick County, S.C.

“The contractor thinks there may have been some movement, and that’s why they’ve put out some seismic monitoring devices,” said Jill Gold­berg, a spokeswoman for Geor­gia’s Department of Trans­portation, which is overseeing the project.

The bridge is about two years from completion and is not open to traffic.

“So if there is any issue with it, we will know about it long before then and it would be fixed,” Goldberg said.

The question involves possible movement of one of the piers, or footings, that are part of the 0.728-mile bridge replacement project.

The contractor is Ala­bama-based Scott Bridge Co. According to the company’s Web site, its largest single contract was the $192 million Interstate 20/Bobby Jones Expressway juncture in Augusta.

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AutumnLeaves
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AutumnLeaves 02/07/12 - 04:17 pm
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When was their movement or is

When was their movement or is it gradual? There's movement all the time in SC. There was a small earthquake, epicenter near Charleston, just Sunday! http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/se020612a.php

David Parker
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David Parker 02/07/12 - 04:44 pm
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Mr Scott will have his hands

Mr Scott will have his hands full if they go ahead and get the contract for raising the bridge on Washington Road and Little River.

burninater
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burninater 02/07/12 - 05:24 pm
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Autumn, they may mean

Autumn, they may mean movement in the materials the bridge is built on. If they didn't adequately characterize that material, the support design could be at fault. Or, it could be an issue with construction practice ...

There haven't been strong enough ground motions from local earthquakes for them to be a factor in this.

Charleston is another story though ... No one knows exactly what the source is, but Charleston had a whopper in 1886, estimated around 7.0 on the Richter. Because the faults in SC are buried under so much material, there is a great deal of uncertainty about how they may behave in the future. It's possible that the source under Charelston just had one big one in it and everything since is aftershock (even 126 years later!), or that the source is capable of another big one in the future.

burninater
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burninater 02/07/12 - 05:25 pm
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Sorry about the "Charelston"

Sorry about the "Charelston" typo, I meant no disrespect :-)

AutumnLeaves
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AutumnLeaves 02/07/12 - 10:54 pm
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Thanks burninater.

Thanks burninater.

Riverman1
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Riverman1 02/07/12 - 11:38 pm
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Charleston is on a faultline

Charleston is on a faultline that ranks it up there with California for potential mega quakes.
http://www.huffingtonpost.com/2010/01/22/us-fault-lines-graphic-ea_n_432...

RoadkiII
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RoadkiII 02/08/12 - 10:43 am
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Rob Pavey
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Rob Pavey 02/08/12 - 11:13 am
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my understanding is that the

my understanding is that the pier/piling in question has moved a few inches and is leaning at an increasingly unexpected angle, so the culprit is likely the footing - not an earthquake fault. But it is true that there are several decent sized geologic faults in that area, including one beneath Clarks Hill Dam that was enough of a concern in the 40s that they filled part of it in with concrete grout during the dam construction.

Riverman1
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Riverman1 02/08/12 - 05:06 pm
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Notice the map in the link I

Notice the map in the link I posted that has Charleston as a hotspot for earthquakes on a par with California. Also, notice how the yellow warning area goes up the Savannah River past Augusta and over into SC toward Columbia creating an area that is earthquake possible, although less than Charleston. It's quite remarkable the very few areas in the country that are considered likely for major earthquakes and Charleston is one with the affected area reaching past Augusta.

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