AMP: Pacific Hwy #1/308 Location: I-5 and Center Ave, Multnomah Cty Just after the OR 99E junction, we’ll start to cross the Columbia into Washington. 1/2 mile to junction SR 14. AMP: 0 Location: I-5 at the Washington Line, Multnomah Cty Welcome to Washington! SR 14 is coming up in just a second.  N to WA-14, S … Continue reading Interstate 5, OR 99E/OR 120 to WA State Line