Cummings Skyway is a locally maintained highway in the Crockett Hills of Contra Costa County, California. Cummings Skyway begins at former US Route 40 at San Pablo Avenue and traverses the Diablo Range southeast to the John Muir Parkway segment of California State Route 4 in Franklin Canyon. Cummings Skyway primarily serves as cutoff route between Interstate 80 and California State Route 4.
The first reference to Cummings Skyway appears in the May/June 1961 California Highways & Public Works. California State Route 4 is cited to have been designated at the Arnold Industrial Freeway between US Route 40 (realigned off San Pablo Avenue onto what is now Interstate 80) and California State Route 21 (now Interstate 680) via a route adopted made by the California Highway Commission during October 1958. Advanced planning of a segment of the Arnold Industrial Freeway between the Cummings Skway east to East Alhambra Avenue in Martinez is cited.
The completed Cummings Skyway is detailed in the September/October 1961 California Highways & Public Works. Cummings Skyway is described as being one of two Federal Aid Secondary Programs constructed in Costa Contra County during 1961. The Cummings Skyway was constructed as part of Federal Aid Secondary Route 1256 as a direct cutoff line between US Route 40 and California State Route 4 in Franklin Canyon. The Cummings Skyway was named in honor of Contra Costa County Supervisor H.L. Cummings. The Cummings Skyway is described as having two 12-foot-wide lanes and a grade which could be expanded to a four-lane expressway in the future. The Cummings Skyway is described as being built as part of Federal Aid Secondary Route 1256 between US Route 40 1.96 miles to Crockett Boulevard to an existing segment which spanned another 1.55 miles to California State Route 4 in Franklin Canyon. Construction of the Cummings Skyway between US Route 40 and Crockett Boulevard is cited to have begun December 3rd, 1959 and was completed by January 16th, 1961.
Cummings Skyway can be accessed from Interstate 80 via Exit 26 on the outskirts of Crockett. From Interstate 80 westbound the Exit to Cummings Skyway is signed as "TO California State Route 4."
From Interstate 80 westbound Exit 26 traffic can either travel west or east on Cummings Skyway. Westbound traffic can follow Cummings Skyway via short of extension of the road to former US Route 40 at San Pablo Avenue.
Eastbound Cummings Skyway jogs over Interstate 80 and climbs into the Crockett Hills to Crockett Boulevard. Traffic is advised via eastbound Cummings Skyway of a truck prohibition on Crockett Boulevard.
From Crockett Boulevard eastbound Cummings Skyway crests the Crockett Hills and descends to California State Route 4 in Franklin Canyon.
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