After two years of conservation efforts, Lake Mead is on the come-up. Voluntary measures by Californians to save water in the Colorado River system are on their way to keeping well over the promised 1.6 million acre-feet of water in the reservoir by 2026, SFGATE reported. In a news release, the Colorado River Board of California announced a coalition over the last 23 months had conserved 1.2 million acre-feet of water.