Dredging with a CSD at a location where the riverbank can not support a crane an amphibious dredge was build. The tracks on the dredger make it possible to build the dredger on land. If there is now crane available the dredger can be build on land and drive itself into the water. If the riverbank is to shallow the dredger can drive to the deeper part. This design makes it possible to assemble the dredge onshore and start dredging at any location.