PSH 4 (Trunk)
PSH 4 began at Jct PSH 10 in Tonasket and headed east to Republic. At Republic, PSH 4 turned and headed south along the Sanpoil River to the Columbia River. PSH 4 crossed the Columbia via the free Keller Ferry. Across the Columbia, PSH 4 continued south and ended at Jct PSH 2 just west of Wilbur. From Tonasket to Republic, PSH 4 is now part of SR 20. From Republic to Wilbur, PSH 4 is now part of SR 21. PSH 4 had no PSH branches.
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