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U.S. Route 99 (US 99) was a main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the Mexican border to Blaine, Washington, on the Canadian border.
- 1926–1972
- 1,600 mi (2,600 km)
U.S. Route 99 ( US 99) was the main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the Mexican border to Blaine, Washington, on the Canadian border.
- 1926–1972
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US 99 spur routes in California: US 199 (LRN 1) (still existing) runs from US 101 near Crescent City to I-5 (former US 99) in Grants Pass, Oregon. US 299 (LRN 20 and LRN 28) (Current State 299) ran from US 101 near Eureka to US 395 in Alturas.
US 99 was one of major highways in the US highway system. It formed the “Backbone of the Pacific States”, much as I-5 does today. The highway ran 1,499 miles from Canada at Blaine, Washington to Mexico at Calexico, California, in the Imperial Valley.
One map shows US 99 running along the old Route 118 (approx. I-210) routing along the foothills. (Source: DPF Research, Gribblenation Blog (Tom Fearer), "The 1926-1934 Los Angeles-Redlands Corridor of former US Route 99", January 2022)
U.S. Route 99 (US 99) was the main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the Mexican border to Blaine, Washington, on the Canadian border.
US 99 at a Glance Original Routing. US 99 had its southern terminus at the Mexican border, then followed SR-111 and then SR-86 to I-10. It went along I-10 to Los Angeles, then followed the general route of I-5 to Wheeler Ridge. From Wheeler Ridge to Sacramento, US 99 generally followed current SR-99.
