Portal:U.S. roads/Selected article/July 2008
Interstate highway.
Although US 12 was not extended into Washington until 1967, portions of it have been part of Washington's
U.S. Highway System since its inception in 1926 as part of US 410. The portion between Napavine and Grand Mound was also designated a U.S. Highway in 1926 as part of US 99
.
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