Tulare County Route J42 is a rural highway corridor mostly carried on Indian Reservation Drive in the Sierra Nevada foothills near Porterville. This highway provides a 14.62-mile connection from California State Route 190 near Porterville to the Tule River Indian Reservation. J42 was commissioned in 1972 and is one of the last two lettered County Routes in Tulare County still signed (the other being J37 on Balch Park Road).
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