Construction of the Central Arizona Project Aqueduct, which began in 1973, soon diverted water from the Colorado River to the lake, converting the lake from an agricultural project into a storage reservoir for the project. Completed in 1994, the New Waddell Dam tripled the surface area of the lake, submerging the old dam beneath its waters. Shortly after the completion of the dam, the area experienced a prolonged drought, and while the lake grew considerably it would not reach full capacity until early 2005. Although still fed by the Agua Fria River, the CAP aqueduct is the primary source of water for the reservoir.