Steel-Fab floating bulkheads consist of a series of sealed caissons with integral ballast chambers that can be filled with water or pressurized with air. The caissons are assembled on the impoundment and then the appropriate ballast chambers are filled with water to vertically lower the bulkhead into position in front of the corresponding spillway gate. For removal, the chambers are vacated with air allowing the bulkhead to be removed from the spillway face and translated vertically to the next gate opening or brought to the surface.