$823 Million, 31 Billion-Gallon Calaveras Reservoir Dam Ready For Debut

After nearly two decades of planning and construction in the rolling, sun-baked hills of the Sunol Valley, crews are finishing a new, $823 million dam that will be the showpiece of a major overhaul to the Bay Area’s water delivery system. At the northernmost tip of the Calaveras Reservoir, the clatter and roar of heavy machinery fills the air as earthmovers and bulldozers, cutting deep treads in soft soil, line the dam’s sloping walls with riprap — big chunks of blueschist rock blasted off a nearby hillside that will defend the earthen structure against erosion.