MP: 16.18 Location: SR 20 and SR 525,  Island Cty JCT SR 525, SR 525 heads south to the Mukilteo Ferry and then spurs to I-5/I-405   MP: 16.33 Location: SR 20 and SR 525, Island Cty Left for SR 20, right for 525   E to SR 20 SPUR, W to Port Townsend Ferry … Continue reading State Route 20, Keystone Ferry Terminal to SR 525