Description - Route 680 in Alameda County is a well-placed freeway featuring wooded hillsides and valleys from Mission Boulevard in Fremont to the Contra Costa County line. This 20-mile designated route takes approximately half an hour to complete.
Copyright: - California Scenic Highway Program
Route 680--Alameda County runs across the Contra Costa Range through Mission Pass into the Sunol Valley
- Route 680--Alameda County crosses the Contra Costa Range through Mission Pass into the Sunol Valley. After crossing the Sunol Valley, the scenic route passes through the narrow canyon of the Arroyo de la Laguna into the south end of the Amador Valley terminating at the Berral Avenue Interchange near the city of Pleasanton. The scenic aspects of the corridor feature the rolling wooded hills of the Contra Costa range contrasted with the flat Sunol Valley ringed by distance hills to the north and east.
Recreation - The Route 680--Alameda County is known for it's historical attractions, parks and beautitul scenery along the inland ridge line.
Climate - Climate in the San Francisco-Bay area varies greatly with elevation and the amount of coastal influence. Areas with more coastal influence experience moderate temperatures year round with fog likely from June through mid-August. Plan your coastal visit in the late summer or fall to ensure the best conditions for viewing the scenery. Also, occasional clear days between winter and spring storms are incomparable. Areas further inland experience greater temperature extremes, with relatively cooler winters and hot summers. Inland areas often receive frost on winter nights. As throughout most of California most of the precipitation comes in the winter months, with April through October normally very dry.
Route 680 runs through the East Bay Area.
Alameda County: From Mission Boulevard in Fremont to the Contra Costa County line.
Contra Costa County: From Alameda County line north to State Route 24 in Walnut Creek.
Directions from :