620. Route 680 is from:
(a) Route 101 near San Jose to Route 780 at Benicia passing near
Warm Springs, Mission San Jose, Scotts Corners, and Sunol, and via
Walnut Creek.
(b) Route 780 at Benicia to Route 80 near Cordelia.
Entire route. [CS&HC Sec. 253.1]
Entire route.
Signed as an Interstate highway.
Portion (b) was once Route 21. By then nowaday Route 780 was Route
680.
Route 680 from the Santa Clara-Alameda county line to Route 24 in
Walnut Creek. [CS&HC Sec. 263.8]
On Diablo Road in Danville is the way to Mount Diablo State Park.
As mentioned in California State Parks, the park is very ideal for
any visitor, in particular those that wish to take a day off from city life
in San Francisco. There, you can visit numerous attractions such as Rock
City, the park's collection of wind-shaped sandstone; Summit Observation
Tower and Museum, containing fascinating views and information concerning
the mountain's geology; and the star attraction, Mount Diablo itself,
rising over 3849 feet above sea level. Facilities include 60 developed
campsites, a horse camp, picnic sites, trails for hikers, horses, and
mountain bikes; and an "all-ability" trail. For more information, please
call (510)687-1800 or (510)837-2525.
As Kurumi once noted, the part of Route 680 from San Jose to Pleasanton
is "The Commute From Hell". Now, the route has the worst commute around.
Caltrans is trying to widen the freeway, but as Kurumi suggests, a new
freeway (most likely another x38) may be needed.
Between Martinez and Route 780 in Benicia is the Carquinez Strait.
Also inbetween is the Martinez-Benicia Bridge. The bridge is not
considered part of Route 680, which explains why the route is discontinuous.
There's a toll for northbound vehicles only; that toll is $1.00.
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