Construction on the San Vicente Dam was completed in 1943 but construction on the First San Diego Aqueduct did not begin until 1945 .
The First San Diego Aqueduct was supplied by the Colorado River Aqueduct .
Construction on the San Vicente Dam was completed in 1943 but construction on the First San Diego Aqueduct , which was supplied by the Colorado River Aqueduct , did not begin until 1945 .