On December 4, 2021, the San Diego County Water Authority will be taking the 74-year old 1st San Diego Aqueduct out of service until December 15, 2021. With the aqueduct being off the district loses water supply to approximately 85% of the District’s its area (see map).
In 1947 the $14 million San Diego Aqueduct was dedicated and put into operation as the Navy officially turned over control to the County Water Authority. The 71-mile aqueduct brought Colorado River water from Riverside County to the San Vicente Reservoir near Lakeside. The Navy sponsored and supervised the construction in order to ensure a supply of water for the important naval and military establishments in and around San Diego. When Colorado River water finally flowed through the aqueduct into San Vicente Reservoir, San Diego had less than a month’s supply on hand.