AMP: Freewater Hwy #339/3 Location: OR 339 and Cobb Rd, Umatilla Cty Oregon 339 begins on the north edge of Milton-Freewater, and is signed! AMP: 2 Location: OR 339 and Sunnyside Rd, Sunnyside, Umatilla Cty A mile later, in unincorporated Sunnyside, we’ll approach Oregon 332. AMP: 2 Location: OR 339 and Sunnyside Rd, Sunnyside, Umatilla Cty Follow 332 … Continue reading Oregon Route 339, Milton-Freewater to OR 332