SR 165 begins at the Mowich Lake entrance to Mount Rainier National Park and heads north via Carbonado and Wilkeson to Jct SR 410 at Buckley. The first 7 miles of SR 165 are unpaved. This is the only state highway in Washington State to still have an unpaved portion. SR 165 is 21.23 miles long.
Before 1964, SR 165 had been part of the Enumclaw-Fairfax branch of PSH 5.
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