Last Driven September 2016 MP: 15 Location: Guide Meridian Rd and Prairie Rd, Whatcom Cty Welcome to Washington! SR 539 is a quick connector down to I-5. MP: 12.63 Location: Guide Meridian Rd and Badger Rd, Whatcom Cty A couple miles later, we’ll approach SR 546. Follow 546 east to Sumas. MP: 12.54 Location: Guide Meridian Rd and Badger … Continue reading State Route 539, BC-13/BC International Boundary to SR 546