Abstract: A portable, floatable barge repair device is disclosed having a water tight box having front, back and side walls and a bottom, and a top opening. A superstructure extends generally upwardly from the back wall of the box, the superstructure having an upper back wall generally adjacent to the back wall of the box, the superstructure also having an upper open top and a side opening opposite the upper back wall. The periphery of the top opening and the side opening form a seal surface for engaging a portion of a barge to be repaired, and gasket means are disposed on the seal surface for providing a water tight seal between the barge and the box. Ballast means are disposed on the front wall of the box opposite the back wall, and ballast tanks surround the box for receiving water therein. Means for securing the repair device to a barge are also provided.