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South Grade Road (S6), Palomar Mountain, San Diego, California
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County Route S6 is a county route in San Diego County, California. It connects Del Mar with Palomar Mountain across San Diego County. It is one of a few San Diego County Routes with a discontinuity in its routing.
About four miles (6.4 km) east on SR 76, S6 begins again as South Grade Road, which winds northward on Palomar Mountain. It intersects with S7, then continues north until it ends at the Palomar Observatory.
The route was defined in 1959.
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