Wikipedia:WikiProject U.S. Roads/Washington/Auto trails


 * California-Banff "B" Line, Oregon (Walla Walla) to Idaho (Newport) via PSH 3, PSH 6
 * Evergreen National Highway, Canada (Blaine) to Idaho (Clarkston) via PSH 1, PSH 8, PSH 3
 * George Washington National Highway, Seattle to Idaho (Coeur d'Alene) via PSH 2
 * Glacier Trail, Canada (Blaine) to Idaho (Newport) via PSH 1, PSH 2, PSH 6
 * National Park to Park Highway, Oregon (Vancouver) to Idaho (Newport) via PSH 1 (branch on PSH 5, Tacoma-Rainier), PSH 2, PSH 6
 * National Parks Highway (Northwest Trail), Oregon (Vancouver) to Idaho (Coeur d'Alene or Rathdrum) via PSH 1 (branch on PSH 5, Tacoma-Rainier), PSH 2
 * Okanogan-Cariboo Trail, Wenatchee to Canada (Oroville) via PSH 10
 * Pacific Highway, Oregon (Vancouver) to Canada (Blaine) via PSH 1
 * Theodore Roosevelt International Highway, Oregon (Walla Walla) to Idaho (Newport) via PSH 3 (Eastern Division), PSH 6
 * Yellowstone Trail, Seattle to Idaho (Coeur d'Alene) via PSH 2, PSH 3, PSH 2


 * By PSH
 * PSH 1
 * 1910: Pacific Highway Association formed
 * 1913: Pacific Highway name assigned
 * PSH 2
 * 1912: Yellowstone Trail Association formed
 * 1913: Sunset Highway name assigned
 * 1915: National Parks Highway Association formed
 * PSH 3
 * 1913: Inland Empire Highway name assigned
 * PSH 5
 * 1913: National Park Highway name assigned
 * 1916: National Park-to-Park Highway Association formed
 * by 1921: National Parks Highway Association extended route from Seattle to Mount Rainier
 * PSH 8
 * 1917: Evergreen Highway Association formed
 * 1937: Evergreen Highway name assigned