U.S. 6

U.S. 6 California

U.S. 6 travels nearly 3,200 miles from Bishop, California, east to Provincetown out on Cape Cod, Massachusetts. The route is known as the Grand Army of the Republic Highway. Within the Golden State, U.S. 6 travels 40.64 miles north from Bishop to the Nevada state line at Queen Valley.

Prior to 1964, U.S. 6 was the longest highway in the United States. U.S. 6 originally started in Long Beach and traveled northeast to Bishop, including a long overlap with U.S. 395. Separating from U.S. 395 at Bishop, U.S. 6 heads northeast into the Owens Valley and then north through the Chalfant Valley, Hammil Valley and Benton Valley to Benton. U.S. 6 angles northeast toward Montgomery Pass in Nevada. U.S. 6 crosses with width of the Silver State, traversing the Great Basin en route to the Rocky Mountains and Denver, Colorado. U.S. 6 proceeds east across the Great Plains and Midwest en route to the Chicago area and eventually into the Northeast, ending on Cape Cod.

U.S. 6 was truncated in 1964 to Bishop in the Eastern Sierra. The former route south is part of U.S. 395, SR 14, Interstate 5, I-110 and SR 1. Originally, U.S. 6 ended at the intersection of SR 1 (former U.S. 101 Alternate) and Atlantic Avenue (former SR 15) in Long Beach.

The former route of U.S. 6 between Sylmar and Inyokern was recommissioned as California State Route 14. Originally following the historic U.S. route along Sierra Highway, SR 14 was largely realigned or upgraded into a freeway alignment, bypassing Santa Clarita, Palmdale, Lancaster and Rosamond. Old U.S. 6, which follows Sierra Highway, is signed with occasional historic U.S. 6 route markers in Los Angeles County.

Sierra Highway is a long roadway that extends from Los Angeles north to Lake Tahoe via SR 14, U.S. 395 and SR 89. However, much of the original Sierra Highway remains separate and distinct from the freeway segment of SR 14, especially between Newhall Pass and Lancaster. While most of Sierra Highway (Historic U.S. 6) is maintained by the county or cities through which it passes, an unrelinquished component of SR 14 (Sierra Highway) remains in the state highway system in Santa Clarita.

Designated as SR 14U, this state route begins at Via Princessa and extends southwest to Newhall Avenue (former San Fernando Road). The "U" means "unrelinquished," i.e. not removed from the state highway system. Signs are posted on SR 14U, which makes it one of the few state routes in California to have a alphanumeric designation along with SR 86S in the Coachella Valley.

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Page Updated Thursday February 17, 2011.