By the 1930s these had fallen into disuse, and the locks were dismantled in 1933. The Forth and Clyde Canal closed at the end of 1962, and by the mid-1970s the Union Canal was filled in at both ends, rendered impassable by culverts in two places and run in pipes under a housing estate. The British Waterways Board (BWB) came into existence on 1 January 1963, the day the Forth and Clyde Canal was closed, with the objective of finding a broad strategy for the future of canals in the United Kingdom.