A flash flood led the southwestern Manitoba municipality of Boissevain-Morton to declare a state of emergency Wednesday, a municipal councillor says, as the spring snow melt sent a torrent of water gushing over frozen farm fields and washing out roads. The municipality estimates that at least 70 per cent of roads in the southern part of Boissevain-Morton, which is south of Brandon, were unsafe for travel due to washouts and overland flooding, according to a Wednesday Facebook post.