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Design and construction of roadway embankments in scour critical and flood-prone areas poses a significant challenge. The risks and challenges are compounded further if the embankment needs to be constructed on top of highly compressible sub-surface soils. This case study describes the engineering design of one such bridge located on Rt. 209 crossing over Rondout Creek in Accord, NY. The existing bridge was only 11.3 m. long and was identified as a hydraulically deficient bridge by New York State Department of Transportation and with a scour depth of greater than 6 m. A 122 m long bridge with a 4.6 m high MSE (Mechanically Stabilized Earth) embankment was proposed with sufficient hydraulic opening as a replacement. To provide a stable foundation for the proposed high embankment, a ground improvement design was developed using geotextile in addition to protection of embankment side slopes with controlled rip-rap placement. The proposed ground stabilization for the embankment was analyzed for slope stability under various flooding conditions on both sides of the bridge and incorporated construction staging requirements.
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