 A proposal from representatives of the highway departments of Idaho and Washington to extend US 2 to Everett was considered by the AASHO's U.S. Route Numbering Committee in January 1946, but was vetoed.The proposal resurfaced during the committee's meeting on December 20, 1946, and was approved as a replacement of US 10 Alternate from Everett to Bonners Ferry and US 195 from Spokane to Newport.The yet-unbuilt highway across Stevens Pass was also proposed in 1956 as a tunnel that would be funded as an addition to the new Interstate Highway System by Senator Warren G. Magnuson, but the amendment did not make it into the final bill.