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User:NE2/Interstate history

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1955 maps and later (ignoring the 1957 numbering; all two-digit numbers given are 1958, and three-digit numbers are not necessarily the original ones)

AASHTO approvals were often several years late.

Interstate 2
Interstate 4
  • 1955 (4); 1969 AASHO west of Tampa became 75
Interstate 5
Interstate 8
  • 1955 (8) - west of I-5 was never officially added
Interstate 10
Interstate 11
  • 2014 AASHTO (11)
Interstate 12
Interstate 15
Interstate 16
Interstate 17
  • 1955 (10, 17); when? (all 17)
Interstate 19
  • 1955 (19)
Interstate 20
Interstate 22
Interstate 24
Interstate 25
Interstate 26
  • 1955 east of Asheville (26)
  • 1985 FHWA/1986 AASHTO Johnson City to Kingsport (181); 2003 AASHTO I-81 to Kingsport (26, denied); 2005 legislated I-81 to Kingsport (26)
  • 1988 AASHTO Asheville to I-81 (26)
  • Interstate 126 (South Carolina): 1955 (126) - plans were very different in 1955
  • Interstate 526 (South Carolina): 1978 AASHTO/1992 FHWA east of I-26 (526) - FHWA is east of Wando River; 1989 AASHTO/1990 FHWA east of SC 7 (526) - but FHWA and 1992 AASHTO says this was all the way to US 17!
Interstate 27
Interstate 29
Interstate 30
Interstate 35
Interstate 37
  • 1957 FHWA (missing from the list) (37)
Interstate 39
  • 1984 AASHTO/1985 FHWA I-80 to I-90 (39, denied but apparently added anyway)
  • 1986 AASHTO/1992 FHWA I-55 to I-80 (39)
  • 1993 AASHTO/1996 FHWA I-90 to Wausau (39)
Interstate 40
Interstate 41
  • 2012 AASHTO (41)
Interstate 43
  • 1968 FHWA/1969 AASHO north of Milwaukee (57); 1974 AASHTO (43)
  • 1987 FHWA/AASHTO south of Milwaukee (43)
Interstate 44
Interstate 45
Interstate 49
  • 1977 AASHTO (part trade-in for I-410, part Howard-Cramer) Opelousas to I-20 (49)
  • 1981 FHWA/AASHTO I-10 to Opelousas (49)
  • 1983 FHWA I-40 to north end of Fayetteville bypass (per AHTD minutes 1984-11 527)
  • 1997 AASHTO I-40 to Fayetteville (49, denied); 1997 AASHTO (540); 2013 AASHTO (49)
  • legislated/1998 AASHTO north of I-310 (49)
  • legislated/1999 AASHTO I-10 to I-310 (49)
  • 2000 AASHTO Fayetteville to Rogers (540); 2013 AASHTO (49)
  • legislated/2000 AASHTO US 71 to I-30 (130); 2013 AASHTO (49)
  • 2007 AASHTO Louisiana to US 71 north of Texarkana and I-40 to I-44 (49, denied); 2011 AASHTO Arkansas to I-435 (49); 2013 AASHTO Louisiana to Missouri (49)
  • 2008 AASHTO I-20 to Arkansas (49, denied); 2014 AASHTO I-220 to Arkansas (49)
Interstate 55
Interstate 57
  • 1955 (57)
Interstate 59
Interstate 64
Interstate 65
Interstate 66
Interstate 68
Interstate 69
  • 1955 Indianapolis to Marshall (69) - note that north of I-90 was farther west in 1957; 1968 FHWA/1969 AASHO Marshall to I-75 (69); 1973 FHWA/AASHTO I-75 to I-475 (69); when? deleted inside I-465 (later became I-165 south of 38th Street); 1983 AASHTO/1987 FHWA north of Flint (69)
  • legislated/2007 AASHTO I-55 to MS 304 (69)
  • legislated/2008 AASHTO along I-55/I-240/I-40 to SR 300 (69)
  • legislated/2010 AASHTO I-64 to US 231 (69)
  • legislated/2011 AASHTO Gilbertsville to Nortonville (69)

and more in Texas...

Interstate 70
Interstate 71
Interstate 72
  • 1968 FHWA/1969 AASHO east of Springfield (72)
  • 1987 AASHTO Springfield to I-172 (72, denied); 1991 AASHTO Springfield to I-172 (172); 1995 FHWA/AASHTO Springfield to Hannibal (72) - FHWA is only east of I-172
  • Interstate 172 (Illinois): 1987 AASHTO (72, denied); 1995 FHWA/AASHTO (172)
Interstate 73
  • 1995 legislated per 1996 AASHTO (NC submitted); 1996 AASHTO Roanoke to Charleston
Interstate 74
  • 1955 west of Cincinnati (74)
  • 1995 legislated per 1996 AASHTO east of Cincinnati (NC submitted); 1996 AASHTO Wytheville to Myrtle Beach
  • Interstate 474 (Illinois): 1955 (474)
Interstate 75
Interstate 76 (west)
  • 1955 east of I-25 (80S); 1968 FHWA/1969 AASHO west of I-25 (80S); 1974 FHWA/AASHTO (76) - Colorado wanted to continue I-76 west to Grand Junction!?
Interstate 76 (east)
Interstate 77
Interstate 78
Interstate 79
Interstate 80
Interstate 81
Interstate 82
Interstate 83
Interstate 84 (west)
Interstate 84 (east)
Interstate 85
Interstate 86 (west)
  • 1955 (15W); 1977 AASHTO (86)
  • unknown spur into Pocatello: 1955
Interstate 86 (east)
  • legislated/1998 AASHTO (86)
Interstate 87
Interstate 88 (west)
  • FHWA/1987 AASHTO (88)
Interstate 88 (east)
Interstate 89
Interstate 90
Interstate 91
Interstate 93
Interstate 94
Interstate 95
Interstate 96
Interstate 97
Interstate 99
  • legislated/1998 AASHTO I-76 to PA 350 (99)
  • when? PA 350 to NY (99)
  • 2014 AASHTO Pennsylvania to I-86 (99)
Alaska
  • 1982 AASHTO (A1 to A4)
Hawaii
Puerto Rico
  • 1983 AASHTO (PRI-1 to PRI-3)