SR 546 starts at Jct SR 539 (numbered Alt US 99 from 1964 to 1969) just north of Lynden and heads east to Jct SR 9 a few miles SW of Sumas. SR 546 is 8.02 miles long
Before 1964, SR 546 had been a branch of SSH 1B.
This highway is more important that its SR number suggests. In my opinion, SR 11 should be extended along I-5 from Exit 250 to Exit 256, then north on SR 539 to Jct SR 546, then east on 546 to SR 9, then north on SR 9 to the Canadian border, connecting with BC 11. The 539/546/9/11 corridor from I-5 to the Trans-Canada highway via the Sumas-Huntingdon border crossing is more important than the SR 539/BC 13 corridor via the Lynden-Aldergrove border crossing. Customs are open 24 hours a day at Sumas-Huntingdon and closed midnight to 6 AM at Lynden-Aldergrove. In 2001, the Washington State Freight Mobility Strategic Investment Board appoved dropping SR 539 north of SR 546 as a strategic freight route. The SR 539/546/9 route is a strategic freight corridor according to FMSIB. In addition to freight, auto traffic is heavier at Sumas-Huntingdon than at Lynden-Aldergrove.
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