| Maintained by | Alameda County, Contra Costa County |
|---|---|
| Length | 17.7 mi (28.5 km) |
| South end |  CR J2 / Tesla Road in Livermore |
| Major junctions |  I-580 in Livermore |
| North end |  SR 4 in Brentwood |
| Construction | |
| Inauguration | 1958 |
Vasco Road is a roadway over the Diablo Range that connects Livermore and Brentwood, California. Although it is not part of the California State Highway system, it is the principal north–south commuter route serving eastern Alameda and Contra Costa counties. The two counties are each responsible for maintaining the portion of the road within their boundaries.
The traffic count in 2008 was estimated at more than 25,000 vehicles per day.[1] Weekend traffic is also heavy in spring and summer, when residents from other parts of California flock to the recreation areas along the Sacramento - San Joaquin River Delta.