MP: I-5/88.77 Location: I-5 and US-12, Grand Mound, Thurston Cty Reassurance shield after US-12 joins I-5   MP: I-5/82.38 Location: S Harrison Ave and I-5, Centralia SR 507 will exit in half a mile MP: I-5/82.02 Location: I-5 and Mellen St, Centralia Old piece of shit sign, but SR 507 exits nonetheless.   E to … Continue reading U.S. Route 12, I-5 to SR 507