History
Chinook Pass was chosen as a route across the Cascade Mountains as a compromise. The height of the route would mean that it would likely never be a year-round road. The alternative was Naches Pass, which with the addition of a short tunnel would be much lower (and easier to keep open in winter). The Naches Pass plan is still on the books as SR 168, but it has never been built.
The cost of the tunnel was the deciding factor, and the Chinook Pass route was chosen.
The Yakima side of a road over Chinook Pass was partially completed in 1914, but then work was abandoned for several years. This section was referred to as the 'Normile Grade'. In 1921 work began again on the Yakima side, below Normile, on the American River. This work was done using horse teams. In 1924, an army tractor was brought in to speed up the work. Work on the west side of the road commenced later, and took longer. The two sides did not meet until 1931 at Tipsoo Lake near the summit.
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