Interstate 680 (I-680) is a north–south auxiliary Interstate Highway in Northern California. It curves around the eastern cities of the San Francisco Bay
tube to a point in Oakland near the present-day western terminus of Interstate980. This was essentially the same as alternative no. 12 from the contemporaneous
547 m) Magic Mountain (California) 4,864 ft (1,483 m) Echo Mountain 3,210 ft (980 m) All the above mountains are part of the San Gabriel Mountains, except