Wikipedia:WikiProject U.S. Roads/Utah/Federal-aid primary routes

SR-40 p. 9, 1974 seems to show all primary (and secondary) routes at the time. These are bolded below.

SR-3 p. 31, 1967 has a decent state map (revised 1961) but without federal aid. SR-201 p. 7, 1965 also looks nice.

• FAP 1: I-15: Arizona to Idaho (SR-85 p. 3, 1960)
  • Spurs: SR-164 (SR-27 p. 16, 1973); SR-268 (SR-186 p. 6, 1966); SR-269 (SR-186 p. 6, 1966)
  • 1923: US-91 Idaho to Arizona
• FAP 2: I-80: Nevada to Wyoming
  • 1923: US-30S, US-530, US-40 Wyoming to Nevada
• FAP 3: I-84: Idaho to I-80
  • 1957: became an Interstate east of I-15
  • 1968: east of I-15 added (SR-3 p. 33, 1968)
  • 1923: US-30S Echo to Ogden
• FAP 4: I-70: I-15 to Colorado, created 1971 (SR-4 pp. 25-26, 39, 1973)
  • 1957: became an Interstate
  • 1923: US-30S Brigham to Tremonton
• FAP 5: I-215 (SR-191 p. 23, 1989)
  • 1923: SR-3 Wyoming to Idaho
• FAP 6
  • 1923: US-40, SR-7 Main Forks (Kimball Junction?) to Orem
• FAP 7
  • 1923: US-40 Duchesne to Colorado (SR-264 p. 4, 1959)
• FAP 8
  • 1923: US-50 Springville to Colorado
• FAP 9
  • 1923: SR-11, US-89 Nephi to Panguitch; SR-132 was later secondary (SR-132 p. 8, 1974)
• FAP 10: I-70: I-15 to (SR-4 p. 11, 1965)
  • 1923: SR-13 Sevier to Cove Fort
• FAP 11: SR-36: US-6 to I-80 (SR-36 p. 6, 1965; SR-36 p. 9, 1991)
  • 1923: SR-36 near Garfield to Tooele
• FAP 13: US-491, US-191: Colorado to I-70 (SR-9 p. 4, 1977; SR-47 p. 23, 1973)
• FAP 14: SR-9: US-91 to US-89 (SR-24 p. 31, 1965)
  • Spurs: SR-17
• FAP 15: US-40: US-189 to Colorado (SR-35 p. 35, 1987; SR-149 p. 7, 1987)
• FAP 15: US-191 through Moab?
• FAP 16: SR-9: I-15 to (SR-318 p. 13, 1992)
• FAP 17: US-91: I-15 to Idaho (SR-91 p. 53, 1992)
• FAP 18: SR-201: I-80 to (SR-201 p. 6, 1963)
• FAP 19: US-189, US-40: I-15 to I-80 (SR-114 p. 9, 1968; SR-35 p. 35, 1987)
  • Spurs: SR-52: I-15 to US-189 (SR-114 p. 6, 1964; SR-247 p. 4, 1984)
• FAP 20?: US-89: US-6 to SR-51 (SR-27 p. 16, 1973)
• FAP 20: SR-13, SR-83: US-91 to at least Lampo Junction (SR-91 p. 53, 1992; SR-300 p. 9, 1991)
• FAP 21: US-89 in Logan
• FAP 22: SR-28: to US-91/I-15
• FAP 23: SR-26, US-89: SR-126 to north of Ogden (SR-3 p. 7, 1963; SR-3 p. 10, 1966)
  • 1968: realigned south of Ogden; had used I-84 and US-89 from I-80 (SR-3 p. 33, 1968)
• FAP 24: SR-10: to SR-55 (SR-10 p. 19, 1970; SR-10 p. 29, 1973; SR-10 p. 41, 1978)
• FAP 26: SR-26: SR-126 to US-89 (SR-3 p. 10, 1966)
  • 1968: deleted (became FAP 23) (SR-3 p. 33, 1968)
• FAP 27: US-89A, US-89: Arizona to US-6 (SR-24 pp. 31, 39, 1965; SR-27 p. 23, 1974)
• FAP 28?: SR-198 (old US-6): US-91 to US-89
• FAP 28: US-6: I-15 to I-70 (earlier Colorado) (SR-24 p. 30, 1965; SR-4 p. 23, 1971; SR-27 p. 31, 1975; SR-51 p. 24, 1992)
• FAP 29: US-6: past Jericho, Eureka (SR-26 p. 11, 1966)
• FAP 30: US-89: I-15 Farmington to SR-26 (SR-3 p. 10, 1966)
  • 1968: extended from I-84 to SR-26 (SR-3 p. 33, 1968)
• FAP 31: SR-56: to US-91
• FAP 31: SR-18: I-15 to beyond Enterprise (SR-300 pp. 9, 31, 1991; SR-307 p. 10, 1984)
• FAP 32: US-89: I-15 Draper to I-15 Becks (SR-186 p. 6, 1966; SR-111 p. 21, 1968)
• FAP 33: 400 South, SR-186: 300 West to I-80 (SR-186 p. 6, 1966; SR-195 p. 5, 1961)
• FAP 34: North Temple, State: I-80 to (SR-186 p. 6, 1966)
• FAP 35: US-89: Arizona to US-89A (SR-24 p. 39, 1965)
• FAP 36: US-191: US-40 to (SR-301 p. 6, 1972)
• FAP 37: SR-126, SR-79: I-15 Layton to US-89 (SR-3 p. 35, 1968)
• FAP 38: SR-28: I-15 to I-15 (created 1968)
• FAP 42: SR-18: old US-91 to (SR-300 p. 6, 1972)
• FAP 43: SR-18: I-15 to beyond Veyo (SR-18 p. 14, 1974)
  • Spurs: SR-34: SR-18 to I-15 (SR-18 p. 14, 1974) created 1974
• FAP 44: SR-30: I-15 to US-91 (SR-30 p. 32, 1989; SR-91 p. 53, 1992)
• FAP 49: SR-95: US-191 to (SR-191 p. 18, 1985)
• FAP 50: US-191: Bluff to (SR-191 p. 18, 1985; SR-163 p. 56, 1986)
• FAP 51: US-163, SR-262, SR-162: Arizona to Colorado (SR-191 p. 23, 1989; SR-163 p. 56, 1986)
• FAP 53: SR-34: SR-18 to I-15 (SR-300 pp. 12, 31, 1991)
• FAP 54: SR-55 (SR-27 p. 25, 1975) created 1975
• FAP 56: US-191: US-6 to US-40 (SR-35 p. 35, 1987)
• FAP 60: SR-224, SR-248: I-80 to US-40 (SR-35 p. 35, 1987)
• FAP 61: SR-32: US-40 to I-80 (SR-35 p. 35, 1987)
• FAP 68: SR-190, SR-210: I-215 to Brighton and back? (SR-35 p. 35, 1987; SR-191 p. 23, 1989)
• FAP 70: US-191: Arizona to US-163 (SR-191 p. 23, 1989)
• ?: SR-259

I'm putting this on hold until I have a better source than the low-resolution maps in the history PDFs. --NE2 14:10, 22 May 2008 (UTC)