Madera County Road 606 is an approximately 4.5-mile rural highway located in the Sierra Nevada foothills near Raymond. The roadway accesses the mining town site of Knowles which was located along Whiskey Creek near the Raymond Granite Quarry. Much of modern Road 606 south of the Knowles town site was constructed over the grade of the Knowles Spur Railroad. Said rail spur operated in the area from 1899 to 1946.
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