A state highway to be known as state route number 503 is established as follows:
Beginning at a junction with state route number 500 at Orchards, thence northerly to a junction with state route number 502 at Battle Ground, thence northerly to Amboy, thence northeasterly by way of Cougar to the Cowlitz-Skamania county line; also
Beginning at a junction with state route number 503 in the vicinity of Yale, thence westerly to a junction with state route number 5 in the vicinity of Woodland.