Abstract: A method and apparatus for quieting flowing waters in which a wall supported by a barge crosswise of water flow with structural members of the wall engaging an underwater obstruction to prevent the wall and barge from moving with the flow of water whereby the wall is adapted to divert water flow around the wall to provide a quiet water working area ahead of the wall. The wall comprises a plurality of gates supported by the structural members for movement relative thereto so that the wall may be raised under adverse conditions to allow the floating platform to rise with high waters with the structural members of the wall being maintained in engagement with the obstruction to prevent or aid in preventing the floating platform from moving with the flow. Under normal conditions, the floating platform will rise and fall with the wall in its water quieting position and the structural members of the wall maintaining engagement with the underwater obstructon.