One person was found dead Tuesday morning following a crash on Interstate-39 in Columbia County. The state Department of Transportation said the crash happened on I-39 southbound at mile marker 114.8 near Arlington at about 7:15 .m. Officials said no assisting agencies were reported. A Wisconsin State Patrol trooper found a black Toyota sedan in the marshy area off the roadway on I-39/90/94 in the town of Dekorra. The location is north of the County Highway CS Poynette exit. Source