 Environmentalists organized a powerful movement to protect streams, lakes, watersheds, and wooded hills from environmental degradation, resulting in the passage of a series of environmental-protection ordinances during the 1970s and 1980s.A program was inaugurated in 1971 to beautify the shores of Town Lake (now named Lady Bird Lake), a downtown lake impounded in 1960 behind Longhorn Crossing Dam.Historic preservationists fought the destruction of Austin's architectural heritage by rescuing and restoring historic buildings.