MP: .06 Location: I-5 and Maytown Rd SE, Maytown Junction I-5 and Maytown Rd, the beginning of SR 121   MP: 2.52 Location: Maytown Rd SE and Tilley Rd S, Maytown SR 121 turns left onto Tilley Rd S with little signage. It heads to Millersylvania State Park   MP: 7.51 Location : I-5 and … Continue reading State Route 121, I-5 to I-5