Abstract: A method for fabricating and installation of a floating bridge or the like provides that a bridge superstructure is supported by a number of pontoons and has opposite ends anchored to shore fundaments. Prefabricated pontoons are positioned successively at mutually spaced locations on the water surface along a center line of a part of the bridge superstructure being formed. Such pontoons are suitably ballasted. Further bridge superstructure is fabricated successively in sections in a production unit positioned on a barge or on a platform stationarily positioned by the shore. Such sections are being pushed outwardly of the production unit one after the other, with a new section being made as a continuation of a preceding section. The fabricated part of the bridge superstructure, formed of several interconnected sections which gradually are protruded from the barge or platform, is slid or pushed out onto the pontoons that are positioned one after the other, and are mounted thereon.