Bridge Abutment/Approach Back?ll

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Bridge Abutment / Approach Back? ll Interstate 90, Wasta, SD South Dakota Department of Transportation 1997 Density: 30 pcf - 40 pcf Volume: 8,000 cy Two narrow bridges were replaced with a Contech Super Span arch bridge to eliminate icing conditions on Interstate 90 near Wasta, South Dakota. Initially, the eastbound lanes’ arch structure was back? lled with a granular material, but the soft underlying soils began to compress under the new load

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