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Artesian conditions blamed for US bridge pier subsidence

US-based Indiana Department of Transportation (Indot) has said that unexpected artesian groundwater conditions are likely to have been the cause of subsidence that led to the closure of a bridge on the I-65 highway last Friday.

Geotechnical investigations have been undertaken over the weekend at the bridge over Wildcat Creek near Lafayette after ground movement of the riverbank pier was observed during work to expand the bridge.

One of the piers was reported to have subsided by 225mm between reopening of the bridge following closure for construction work by contractor Walsh Construction.

Indot has said that the bridge will remain closed until the geotechnical investigation is completed and a detailed plan has been developed to address the problem and prevent further settlement.

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