For the remainder of its course to the Gulf, the river forms the boundary between Baja California (west) and Sonora (east). River, however, is a misnomer as the Colorado is dry or small stream most of the year, due to its flow being almost completely exhausted by upstream diversions. The river bed will occasionally contain water, though, due either to monsoon storms over the Gila River Basin, or more rarely due to a particularly heavy snowmelt in the Rocky Mountains. Since the filling of Lake Powell in the 1960s the latter has only occurred four times - the unusually wet years of 1983 through 1986. In May 2014, an agreement between the US and Mexican governments known as Minute 319 enabled the intentional release of water into the Colorado River bed for the first time, with the goal of revitalizing the ecosystem of the Colorado River Delta.