Madera County Road 603 is an approximately nine-mile rural highway located in the Sierra Nevada foothills. The corridor was previously known as Daulton Road and passes the former Raymond Branch Railroad siding of Daulton. Much of early Daulton Road serviced the numerous copper mines of Daulton Ranch between modern Roads 29 and 600. The corridor was extended east to Road 400 as part of the construction of Hidden Dam and the Hensley Lake reservoir in 1974.
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