Last Driven April 2015 (Historic Photo: September 2008) MP: I-5/70.66 Location: I-5 and Main Ave, Napavine Reassurance shield acknowledging both highways after the interchange (Historic Photo: September 2008) MP: I-5/69.37 Location: I-5 and US-12, Lewis Cty US-12 will split from I-5 pretty soon and take the truck lane used for the gradual climb of the … Continue reading U.S. Route 12, SR 508 to I-5