The I88 culvert crossing of Carrs Creek in Sidney, NY collapsed during the record setting Mid‐ Atlantic States Flood of June 2006. Rapid construction with geofoam as lightweight fill enabled partial reopening of I88 by Labor Day 2006. Shortly after reopening of the roadway, rapid settlements developed. The geofoam fill was removed and I88 was rebuilt using lightweight aggregates. An investigation of the rapid construction failure was completed in 2009. This report examines the failure of the re‐construction and the results of the subsequent investigation. Alternative causes for the failure have been identified based on previous observations, lab tests and computer models. Suggestions for improving rapid construction practice with geofoam are provided.