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Vasco Road (California)
Vasco Road is an unnumbered highway that connects Livermore, California and Brentwood, California. Although it is not part of the California State Highway system, it is the principal north-south commuter route serving eastern Contra Costa and Alameda 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.〔(''Pleasanton Weekly'', September 12, 2008 )〕 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.
==History==
Originally, Vasco Road was a two-lane, very narrow highway that began at U. S. Highway 50 (now Interstate 580) and wound over the Diablo Range and through the Kellogg Creek valley. In 1957, Alameda County linked three other streets inside Livermore to extend Vasco to Tesla Road. A ribbon-cutting ceremony opened the new Vasco Road on August 1, 1958.〔Livermore Heritage Guild Newsletter September/October 1988. "70 Birthday Candles for Altamont Pass Highway, 50 for Vasco Road."()〕
Booming population growth caused a sharp increase in housing prices throughout the Bay Area. People working in Silicon Valley and the Tri-Valley areas began moving into the relatively undeveloped East County area of Contra Costa County. By the early 1990s, traffic congestion on Vasco Road had become severe and accidents were frequent.
In 1996, concurrently with the construction of Los Vaqueros Reservoir, a 12.8-mile segment of Vasco was relocated and widened to accommodate increased traffic and heavy trucks.〔Hallisy, Erin. "Safer Road to Open in East Bay / Brentwood-Livermore route to change because of reservoir." April 15, 1996. ()〕 The old roadway was submerged by the reservoir. When the road re-opened, it carried about 16,000 vehicles per day.〔"The Dilemma of Vasco Road," Traffic Safety Center on-line newsletter, volume 2, number 2, Spring-Summer 2004.()〕 In 2009, Vasco Road was extended northwestward from Walnut Street to Marsh Creek Road, where it joined the third segment of John Marsh Heritage Highway (a.k.a. California State Route 4 Bypass, now part of California State Route 4).〔("State Route 4 Bypass Authority Project Information Web site )〕 In 2010, a section of the road in Alameda County was relocated and widened, eliminating a steep narrow section with several switchbacks.
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