Gribblenation

The current route of Interstate 580 is 76 miles long and is one of the most important freeways in California.  Interstate 580 westbound stretches from Interstate 5 in San Joaquin County west over Altamont Pass of Alameda County to Interstate 80 in Oakland.  From Oakland  the route of Interstate 580 continues westward over San Francisco Bay to US Route 101 in San Rafael of Marin County via the Richmond-San Rafael Bridge.  The route of Interstate 580 occupies a historic corridor that carried highways such as; El Camino Viejo, the Lincoln Highway, US Route 48, California State Route 17 and US Route 50.  Interstate 580 even was intended to be one of the primary components to what would have been Interstate 5 West. Part 1; the history of transportation over Altamont Pass and lead up to Interstate 580 The first major highway over the present general corridor of Interstate 580 ("I-580") was El Camino Viejo.  The El Camino Viejo was an inland alternate rout...