AARoads:United States/California/History/Routes in adjoining states

Arizona

• I-8: part of the 1914 plan (Borderland Highway)
• I-10: added ca. 1927 (shown on 1927 federal 7% map on page 9 of [1] but not the 1927 list on page 15)
• SR 72: added between 1930 and 1935 ([2])
• I-40: part of the 1914 plan (Santa Fe Highway)

Nevada

• US 95: SR 5 in 1919
• SR 164: SR 68 by 1940
• I-15: SR 6 in 1919, but only north of Jean until 1921
• SR 161: SR 53 by 1935
• SR 16 by 1929
• SR 372: SR 52 by 1937
• SR 373: SR 29 by 1933
• SR 374: SR 58 by 1937
• SR 267: SR 72 by 1942
• SR 71 by 1942
• SR 266: SR 3 in 1917
• SR 264: SR 3A by 1933
• US 6: SR 10 by 1929
• SR 359, SR 31 by 1933; later cut back and reextended to the present crossing by 1947
• SR 3C by 1946
• SR 338: SR 22 by 1929
• US 395: SR 19 by 1929
• SR 88: SR 37 by 1934
• US 50: SR 3 in 1917
• SR 28: SR 28 by 1932?
• I-80: SR 1 in 1917
• US 395: SR 9 in 1921
• SR 81 by 1942
• SR 8 in 1921; SR 8A by 1929

Oregon

• 19 Fremont Highway: included in 1917 plan
• 50 Klamath Falls-Malin Highway: 4 from 1919 to 1939, then 50
• 426 Hatfield Highway: 1937
• 4 The Dalles-California Highway: included in 1917 plan, but moved to Malin in 1919; 420 Midland Highway in 1931; 50 Klamath Falls-Weed Highway ca. 1935?; 4 moved back in 1939
• 1 Pacific Highway: included in 1917 plan
• 25 Redwood Highway: included in 1917 plan
• 9 Oregon Coast Highway: included in 1917 plan as 3