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Highway History

In 1998, with the Interstate System essentially complete, FHWA's Office of Engineering compiled information about development of the program. In making this information available to the public, we have not updated the material. All information is as of 1998 when the Office of Engineering compiled the report.

The Dwight D. Eisenhower System of Interstate and Defense Highways

Part II - Mileage

Summary

Dwight D. Eisenhower System of Interstate & Defense Highways Route Summary as of 12/31/97
Mileage DesignationMain RoutesLoopsSpursTotal
23 USC 103(e)38,963.402,741.471,089.6242,794.49
23 USC 139(a)1,182.34493.33432.662,108.33
NHS Act109.70----109.70
Miles That Overlap Other Routes1,045.4535.77--1,081.22
TOTAL Length Including Overlap41,300.893,270.571,522.2846,093.74
NET Length Excluding Overlap40,255.443,234.801,522.2845,012.52
Number of Routes66130104300
Footnotes:
  • 23 USC 103(e) mileage is designated under Sections 103(e)(1), (2) & (3) of Title 23 U.S. Code and most was constructed with 90 percent Federal-Aid Interstate Construction funds.
  • 23 USC 139(a) mileage is designated under Section 139(a) of Title 23 and was built without Interstate Construction fund participation.
  • NHS Act routes were added in accordance with Section 332(a) of the NHS Act of 1995.
  • Overlap mileage is included in the Total Length of each overlap route.
  • NET Lengths only include the overlap mileage once, as assigned to the predominant route.
Interstate Routes and Their Lengths (in miles)
State Interstate Route No "CHARGEABLE" MILEAGE"N0N-CHARGEABLE" MILEAGEMileage of Other Overlapping Routes Overlap Route Number Net Length w/o Overlap (Miles) Total Length (Miles)
Original 42,500 Miles 23 USC 103(e)(1),(3)Howard-Cramer Additions 23 USC 103(e)(2)Subtotal 103e(1),(2)(3)Miles Added Under 23 USC 139(a)High Priority Route Additions per NHS Act
AL1066.30--66.30------ 66.3066.30
AL2084.60--84.60----130.10I-5984.60214.70
AL59241.40---241.40--------- 241.40241.40
AL65367.00---367.00--------- 367.00367.00
AL8580.00---80.00--------- 80.0080.00
AL1654.90---4.90--------- 4.904.90
AL3592.30---2.30--------- 2.302.30
AL45932.80---32.80--------- 32.8032.80
AL56521.40---21.40--------- 21.4021.40
AL7594.50---4.50--------- 4.504.50
AL10 Routes905.200.00905.200.000.00130.10 905.201,035.30
 
AZ8178.32---178.32--------- 178.32178.32
AZ10391.94---391.94--------- 391.94391.94
AZ1529.37---29.37--------- 29.3729.37
AZ17145.24---145.24--------- 145.24145.24
AZ1963.35---63.35--------- 63.3563.35
AZ40359.23---359.23--------- 359.23359.23
AZ 6 Routes1,167.450.001,167.450.000.000.00 1,167.451,167.45
 
AR30143.08---143.08--------- 143.08143.08
AR40284.80---284.80--------- 284.80284.80
AR5570.00---70.00------2.22I-4070.0072.22
AR43012.93---12.93--------- 12.9312.93
AR440------0.009.96------ 9.969.96
AR5408.13---8.135.97------ 14.1014.10
AR6307.40---7.40--------- 7.407.40
AR 7 Routes526.340.00526.3415.930.002.22 542.27544.49
 
CA5797.01---797.01--------- 797.01797.01
CA8170.00---170.00--------- 170.00170.00
CA10240.90---240.90------1.60I-5240.90242.50
CA15287.30---287.30--------- 287.30287.30
CA40154.60---154.60--------- 154.60154.60
CA80202.20---202.20--------- 202.20202.20
CA10510.307.0017.30--------- 17.3017.30
CA11020.50---20.50--------- 20.5020.50
CA20513.00---13.00--------- 13.0013.00
CA21048.60---48.60--------- 48.6048.60
CA215------0.0054.50------ 54.5054.50
CA238------0.002.10------ 2.102.10
CA28057.10---57.10--------- 57.1057.10
CA3055.30---5.30--------- 5.305.30
CA3803.30---3.30--------- 3.303.30
CA40572.40---72.40--------- 72.4072.40
CA50532.90---32.90--------- 32.9032.90
CA58068.40---68.407.30------ 75.7075.70
CA60527.40---27.40--------- 27.4027.40
CA68058.00---58.0012.50------ 70.5070.50
CA710------0.0019.70------ 19.7019.70
CA7806.50---6.50--------- 6.506.50
CA80528.00---28.00--------- 28.0028.00
CA880------0.0044.70------ 44.7044.70
CA9800.80---0.801.00------ 1.801.80
CA25 Routes2,304.517.002,311.51141.800.001.60 2,453.312,454.91
 
CO25298.94---298.94--------- 298.94298.94
CO70450.30---450.30--------- 450.30450.30
CO76184.14---184.14--------- 184.14184.14
CO22512.18---12.18--------- 12.1812.18
CO2705.20---5.20--------- 5.205.20
CO 5 Routes950.760.00950.760.000.000.00 950.76950.76
 
CT8498.52---98.52--------- 98.5298.52
CT9157.98---57.98--------- 57.9857.98
CT95111.57---111.57--------- 111.57111.57
CT2915.88---5.88--------- 5.885.88
CT3847.40---7.40--------- 7.407.40
CT395------0.0054.69------ 54.6954.69
CT6841.40---1.40--------- 1.401.40
CT6911.606.698.29--------- 8.298.29
CT 8 Routes284.356.69291.0454.690.000.00 345.73345.73
 
DE9523.43---23.43--------- 23.4323.43
DE2955.71---5.71--------- 5.715.71
DE49511.47---11.47--------- 11.4711.47
DE 3 Routes40.610.0040.610.000.000.00 40.6140.61
 
DC661.11---1.11--------- 1.111.11
DC950.12---0.12--------- 0.120.12
DC2957.72---7.72--------- 7.727.72
DC3953.49---3.49--------- 3.493.49
DC6951.21---1.21--------- 1.211.21
DC 5 Routes13.650.0013.650.000.000.00 13.6513.65
 
FL4132.06---132.06--------- 132.06132.06
FL10362.82---362.82--------- 362.82362.82
FL75425.7546.31472.06--------- 472.06472.06
FL95382.40---382.40--------- 382.40382.40
FL1106.39---6.39--------- 6.396.39
FL175------0.001.44------ 1.441.44
FL1954.41---4.41--------- 4.414.41
FL27559.58---59.58--------- 59.5859.58
FL29535.06---35.06--------- 35.0635.06
FL375------0.001.34------ 1.341.34
FL3951.21---1.21--------- 1.211.21
FL5954.20---4.208.80------ 13.0013.00
FL12 Routes1,413.8846.311,460.1911.580.000.00 1,471.771,471.77
 
GA16165.41---165.41--------- 165.41165.41
GA20201.75---201.75--------- 201.75201.75
GA244.12---4.12--------- 4.124.12
GA5919.94---19.94--------- 19.9419.94
GA75355.00---355.00--------- 355.00355.00
GA85170.94---170.94------8.00I-75170.94178.94
GA95111.69---111.69--------- 111.69111.69
GA18543.57---43.575.50------ 49.0749.07
GA28561.63---61.63------1.21I-8561.6362.84
GA47515.59---15.59--------- 15.5915.59
GA516------0.006.40------ 6.406.40
GA5201.009.1110.11--------- 10.1110.11
GA5751.7029.1630.86--------- 30.8630.86
GA6752.477.7810.25--------- 10.2510.25
GA985------0.0024.40------ 24.4024.40
GA15 Routes1,154.8146.051,200.8636.300.009.21 1,237.161,246.37
 
HIH-126.90---26.90--------- 26.9026.90
HIH-28.23---8.23--------- 8.238.23
HIH-316.09---16.09--------- 16.0916.09
HI H-201------0.004.10------ 4.104.10
HI 4 Routes51.220.0051.224.100.000.00 55.3255.32
 
ID15195.87---195.87--------- 195.87195.87
ID84275.36---275.36--------- 275.36275.36
ID8663.18---63.18--------- 63.1863.18
ID9073.73---73.73--------- 73.7373.73
ID1843.52---3.52--------- 3.523.52
ID 5 Routes611.660.00611.660.000.000.00 611.66611.66
 
IL2438.73---38.73--------- 38.7338.73
IL39------0.00119.59------ 119.59119.59
IL55275.66---275.66------18.70I-70275.66294.36
IL57352.98---352.98------5.59I-70352.98358.57
IL64123.98---123.98------4.14I-57123.98128.12
IL70160.25---160.25--------- 160.25160.25
IL7278.66---78.6694.00------ 172.66172.66
IL74214.29---214.29------5.89I-55214.29220.18
IL80163.52---163.52--------- 163.52163.52
IL88------0.00140.59------ 140.59140.59
IL9075.95---75.9516.71---15.39I-9492.66108.05
IL9474.89---74.89------2.48I-8074.8977.37
IL155------0.0032.06------ 32.0632.06
IL172------0.0019.00------ 19.0019.00
IL18013.19---13.19--------- 13.1913.19
IL190------0.003.07------ 3.073.07
IL25527.00---27.00--------- 27.0027.00
IL27014.97---14.97--------- 14.9714.97
IL2808.21---8.21------9.39I-748.2117.60
IL29029.84---29.84--------- 29.8429.84
IL29448.10---48.10------5.32I-8048.1053.42
IL355------0.0020.01------ 20.0120.01
IL47414.88---14.88--------- 14.8814.88
IL23 Routes1,715.100.001,715.10445.030.0066.90 2,160.132,227.03
 
IN64124.04---124.04--------- 124.04124.04
IN65262.08---262.08--------- 262.08262.08
IN69157.79---157.79--------- 157.79157.79
IN70154.14---154.14------2.13I-65154.14156.27
IN74151.27---151.27------20.60I-465151.27171.87
IN80151.65---151.65--------- 151.65151.65
IN9021.30---21.30------135.60I-8021.30156.90
IN9429.68---29.68------16.05I-8029.6845.73
IN16421.43---21.43--------- 21.4321.43
IN2656.73---6.73--------- 6.736.73
IN2753.30---3.30--------- 3.303.30
IN46553.14---53.145.03------ 58.1758.17
IN469------0.0029.60------ 29.6029.60
IN13 Routes1,136.550.001,136.5534.630.00174.38 1,171.181,345.56
 
IA29148.81---148.81------3.00I-80148.81151.81
IA35218.47---218.47--------- 218.47218.47
IA745.39---5.39--------- 5.395.39
IA80292.28---292.28------14.29!-35292.28306.57
IA1290.28---0.28--------- 0.280.28
IA23513.85---13.85--------- 13.8513.85
IA2809.40---9.40--------- 9.409.40
IA38073.12---73.12--------- 73.1273.12
IA4800.75---0.75--------- 0.750.75
IA68019.71---19.71------9.91I-2919.7129.62
IA10 Routes782.060.00782.060.000.0027.20 782.06809.26
 
KS35235.52---235.52--------- 235.52235.52
KS70424.17---424.17--------- 424.17424.17
KS13595.74---95.74--------- 95.7495.74
KS23516.53---16.53--------- 16.5316.53
KS335------0.0050.10------ 50.1050.10
KS43528.03---28.03--------- 28.0328.03
KS47011.45---11.45--------- 11.4511.45
KS6358.90---8.90--------- 8.908.90
KS6700.84---0.84--------- 0.840.84
KS 9 Routes821.180.00821.1850.100.000.00 871.28871.28
 
KY2493.37---93.37--------- 93.3793.37
KY64191.55---191.55--------- 191.55191.55
KY65137.60---137.60--------- 137.60137.60
KY7178.22---78.22------19.70I-7578.2297.92
KY75184.70---184.70------6.90I-64184.70191.60
KY26422.88---22.88--------- 22.8822.88
KY2653.28---3.2821.20------ 24.4824.48
KY27524.14---24.14--------- 24.1424.14
KY4714.80---4.80--------- 4.804.80
KY 9 Routes740.540.00740.5421.200.0026.60 761.74788.34
 
LA10274.42---274.42--------- 274.42274.42
LA1285.59---85.59--------- 85.5985.59
LA20189.87---189.87--------- 189.87189.87
LA4934.10153.18187.2819.55------ 206.83206.83
LA5565.81---65.81--------- 65.8165.81
LA5911.48---11.48--------- 11.4811.48
LA1108.89---8.89--------- 8.898.89
LA21012.40---12.40--------- 12.4012.40
LA22017.60---17.60--------- 17.6017.60
LA31011.50---11.50--------- 11.5011.50
LA5103.16---3.16--------- 3.163.16
LA6104.02---4.02--------- 4.024.02
LA12 Routes718.84153.18872.0219.550.000.00 891.57891.57
 
ME95297.89---297.89--------- 297.89297.89
ME1951.55---1.55--------- 1.551.55
ME29510.90---10.90--------- 10.9010.90
ME3954.74---4.74--------- 4.744.74
ME495------0.0050.50------ 50.5050.50
 
MD68------0.0080.30------ 80.3080.30
MD7093.23---93.23--------- 93.2393.23
MD8111.99---11.99--------- 11.9911.99
MD8334.05---34.05--------- 34.0534.05
MD95108.48---108.48--------- 108.48108.48
MD972.6714.9017.57--------- 17.5717.57
MD1951.332.203.531.40------ 4.934.93
MD27034.52---34.52--------- 34.5234.52
MD2950.78---0.78--------- 0.780.78
MD3701.491.182.67--------- 2.672.67
MD3950.72---0.72--------- 0.720.72
MD49515.26---15.26--------- 15.2615.26
MD5950.8019.3120.11--------- 20.1120.11
MD69528.58---28.582.20------ 30.7830.78
MD7954.05---4.055.47------ 9.529.52
MD89515.00---15.00--------- 15.0015.00
MD16 Routes352.9537.59390.5489.370.000.00 479.91479.91
 
MA848.06---8.06--------- 8.068.06
MA90134.70---134.702.90------ 137.60137.60
MA9154.92---54.92--------- 54.9254.92
MA9331.90---31.9014.10------ 46.0046.00
MA9552.56---52.5637.54------ 90.1090.10
MA19019.10---19.10--------- 19.1019.10
MA19525.42---25.4214.28------ 39.7039.70
MA29019.76---19.76--------- 19.7619.76
MA2915.53---5.53--------- 5.535.53
MA2954.05---4.05--------- 4.054.05
MA3914.68---4.68--------- 4.684.68
MA395------0.0012.29------ 12.2912.29
MA49588.5312.90101.4318.50------ 119.93119.93
MA13 Routes449.2112.90462.1199.610.000.00 561.72561.72
 
MI69126.60---126.6066.80---5.20I-96193.40198.60
MI75395.70---395.70--------- 395.70395.70
MI94275.60---275.60--------- 275.60275.60
MI96192.70---192.70--------- 192.70192.70
MI1943.40---3.40--------- 3.403.40
MI19680.60---80.60--------- 80.6080.60
MI27530.30---30.30--------- 30.3030.30
MI2963.40---3.40--------- 3.403.40
MI3751.10---1.10--------- 1.101.10
MI47516.80---16.80--------- 16.8016.80
MI49611.80---11.80--------- 11.8011.80
MI6757.80---7.80--------- 7.807.80
MI69628.20---28.20--------- 28.2028.20
MI13 Routes1,174.000.001,174.0066.800.005.20 1,240.801,246.00
 
MN35220.46---220.46------39.23I-35E220.46259.69
MN35E39.23---39.23--------- 39.2339.23
MN35W41.78---41.78--------- 41.7841.78
MN90275.70---275.70--------- 275.70275.70
MN94259.22---259.22------0.27I-35E259.22259.49
MN39410.03---10.03--------- 10.0310.03
MN49442.73---42.73--------- 42.7342.73
MN5351.57---1.57--------- 1.571.57
MN69421.98---21.98------0.65I-35E21.9822.63
MN 9 Routes912.700.00912.700.000.0040.15 912.70952.85
 
MS1077.10---77.10--------- 77.1077.10
MS20129.30---129.30------25.20I-55/59129.30154.50
MS55289.70---289.70--------- 289.70289.70
MS59171.20---171.20--------- 171.20171.20
MS1104.30---4.30--------- 4.304.30
MS22011.60---11.60--------- 11.6011.60
MS 6 Routes683.200.00683.200.000.0025.20 683.20708.40
 
MO29124.80---124.80------5.50I-35/40124.80130.30
MO35113.80---113.80------1.00I-70113.80114.80
MO44290.80---290.80--------- 290.80290.80
MO55208.40---208.40------1.00I-44208.40209.40
MO5722.00---22.00--------- 22.0022.00
MO64------0.0014.70------ 14.7014.70
MO70251.60---251.60--------- 251.60251.60
MO15510.60---10.60--------- 10.6010.60
MO1706.25---6.254.29------ 10.5410.54
MO22914.60---14.60--------- 14.6014.60
MO2553.70---3.70--------- 3.703.70
MO27035.60---35.60--------- 35.6035.60
MO43550.40---50.40--------- 50.4050.40
MO47016.50---16.50--------- 16.5016.50
MO6353.70---3.70--------- 3.703.70
MO6700.60---0.60--------- 0.600.60
MO16 Routes1,153.350.001,153.3518.990.007.50 1,172.341,179.84
 
MT15395.09---395.09--------- 395.09395.09
MT90542.33---542.33------7.65I-15542.33549.98
MT94247.91---247.91--------- 247.91247.91
MT1151.39---1.39--------- 1.391.39
MT3150.82---0.82--------- 0.820.82
MT 5 Routes1,187.540.001,187.540.000.007.65 1,187.541,195.19
 
NE762.48---2.48--------- 2.482.48
NE80455.31---455.31--------- 455.31455.31
NE1293.21---3.21--------- 3.213.21
NE1803.18---3.18--------- 3.183.18
NE4804.04---4.04--------- 4.044.04
NE68013.26---13.26--------- 13.2613.26
NE 6 Routes481.480.00481.480.000.000.00 481.48481.48
 
NV15123.77---123.77--------- 123.77123.77
NV80410.67---410.67--------- 410.67410.67
NV5156.00---6.0014.90------ 20.9020.90
NV5803.00---3.001.21------ 4.214.21
NV 4 Routes543.440.00543.4416.110.000.00 559.55559.55
 
NH8960.93---60.93--------- 60.9360.93
NH93131.81---131.81--------- 131.81131.81
NH9516.13---16.13--------- 16.1316.13
NH2935.54---5.545.68------ 11.2211.22
NH3934.60---4.60--------- 4.604.60
NH 5 Routes219.010.00219.015.680.000.00 224.69224.69
 
NJ762.80---2.80--------- 2.802.80
NJ7868.15---68.15--------- 68.1568.15
NJ8068.10---68.10--------- 68.1068.10
NJ9579.08---79.08--------- 79.0879.08
NJ1957.0027.3034.30--------- 34.3034.30
NJ2782.00---2.00--------- 2.002.00
NJ28018.10---18.10--------- 18.1018.10
NJ28767.40---67.40--------- 67.4067.40
NJ29577.30---77.30--------- 77.3077.30
NJ6764.60---4.60--------- 4.604.60
NJ10 Routes394.5327.30421.830.000.000.00 421.83421.83
 
NM10164.28---164.28--------- 164.28164.28
NM25462.11---462.11--------- 462.11462.11
NM40373.51---373.51--------- 373.51373.51
NM 3 Routes999.900.00999.900.000.000.00 999.90999.90
 
NY780.50---0.50--------- 0.500.50
NY81184.10---184.10--------- 184.10184.10
NY8471.60---71.60--------- 71.6071.60
NY87302.95---302.9529.80------ 332.75332.75
NY88117.77---117.77--------- 117.77117.77
NY90386.77---386.77--------- 386.77386.77
NY9523.25---23.25--------- 23.2523.25
NY19028.45---28.45--------- 28.4528.45
NY27833.25---33.25--------- 33.2533.25
NY28711.60---11.60--------- 11.6011.60
NY2909.96---9.96--------- 9.969.96
NY2959.00---9.00--------- 9.009.00
NY39014.4060.5074.90--------- 74.9074.90
NY478------0.001.90------ 1.901.90
NY48114.99---14.99--------- 14.9914.99
NY49037.97---37.97--------- 37.9737.97
NY4953.60---3.6062.70------ 66.3066.30
NY5871.40---1.40--------- 1.401.40
NY590---5.105.10--------- 5.105.10
NY6786.30---6.307.80------ 14.1014.10
NY68426.60---26.60--------- 26.6026.60
NY69014.60---14.60--------- 14.6014.60
NY78710.50---10.50--------- 10.5010.50
NY7902.55---2.55--------- 2.552.55
NY8780.70---0.70--------- 0.700.70
NY8908.90---8.90--------- 8.908.90
NY8951.10---1.10--------- 1.101.10
NY9904.14---4.142.04------ 6.186.18
NY28 Routes1,326.9565.601,392.55104.240.000.00 1,496.791,496.79
 
NC2639.95---39.95--------- 39.9539.95
NC40288.49---288.4991.40---38.98I-40379.89418.87
NC73------0.00---56.70--- 56.7056.70
NC7799.47---99.475.80------ 105.27105.27
NC85233.41---233.41--------- 233.41233.41
NC95181.39---181.39--------- 181.39181.39
NC2402.22---2.226.92------ 9.149.14
NC2772.69---2.691.72------ 4.414.41
NC440------0.0016.70------ 16.7016.70
NC540------0.005.00------ 5.005.00
NC10 Routes847.620.00847.62127.5456.7038.98 1,031.861,070.84
 
ND29217.50---217.50--------- 217.50217.50
ND94352.50---352.50--------- 352.50352.50
ND1941.19---1.19--------- 1.191.19
ND3 Routes571.190.00571.190.000.000.00 571.19571.19
 
OH70225.69---225.69--------- 225.69225.69
OH71245.70---245.70------1.96I-75/70245.70247.66
OH7419.45---19.45--------- 19.4519.45
OH75211.53---211.53--------- 211.53211.53
OH7677.82---77.82--------- 77.8277.82
OH77163.10---163.10--------- 163.10163.10
OH80202.07---202.0735.00------ 237.07237.07
OH90101.33---101.33------142.80I-80101.33244.13
OH27055.08---55.08--------- 55.0855.08
OH27135.79---35.79------5.84I-48035.7941.63
OH27552.09---52.09------3.45I-7452.0955.54
OH2773.62---3.62--------- 3.623.62
OH28012.43---12.43--------- 12.4312.43
OH4706.40---6.40--------- 6.406.40
OH4710.54---0.54--------- 0.540.54
OH47519.92---19.92--------- 19.9219.92
OH48042.88---42.88--------- 42.8842.88
OH4901.71---1.71--------- 1.711.71
OH67010.68---10.68--------- 10.6810.68
OH67525.91---25.91--------- 25.9125.91
OH68016.65---16.65--------- 16.6516.65
OH21 Routes1,530.390.001,530.3935.000.00154.05 1,565.391,719.44
 
OK35235.96---235.96--------- 235.96235.96
OK40329.50---329.50------1.53I-35329.50331.03
OK44209.40---209.40114.76---4.37I-35324.16328.53
OK2353.66---3.661.54------ 5.205.20
OK24011.87---11.874.35------ 16.2216.22
OK24415.75---15.75--------- 15.7515.75
OK4442.51---2.51--------- 2.512.51
OK7 Routes808.650.00808.65120.650.005.90 929.30935.20
 
OR5308.41---308.41--------- 308.41308.41
OR8210.72---10.72--------- 10.7210.72
OR84368.34---368.346.89------ 375.23375.23
OR1053.49---3.49--------- 3.493.49
OR20526.07---26.07--------- 26.0726.07
OR4053.39---3.39--------- 3.393.39
OR6 Routes720.420.00720.426.890.000.00 727.31727.31
 
PA7081.51---81.51------87.22I-7681.51168.73
PA76351.25---351.25--------- 351.25351.25
PA7876.69---76.69--------- 76.6976.69
PA79180.18---180.18------3.55I-70180.18183.73
PA80311.24---311.24--------- 311.24311.24
PA81233.70---233.70--------- 233.70233.70
PA8350.06---50.06--------- 50.0650.06
PA8449.75---49.75--------- 49.7549.75
PA9046.60---46.60--------- 46.6046.60
PA9550.85---50.85--------- 50.8550.85
PA99------0.00---53.00--- 53.0053.00
PA17611.27---11.27--------- 11.2711.27
PA180------0.0028.80------ 28.8028.80
PA27629.38---29.38--------- 29.3829.38
PA27919.07---19.07--------- 19.0719.07
PA2833.07---3.07--------- 3.073.07
PA37614.69---14.69--------- 14.6914.69
PA38028.30---28.30--------- 28.3028.30
PA47621.25---21.25110.00------ 131.25131.25
PA5791.30---1.30--------- 1.301.30
PA6762.59---2.59--------- 2.592.59
PA21 Routes1,562.750.001,562.75138.8053.0090.77 1,754.551,845.32
 
RI9543.31---43.31--------- 43.3143.31
RI1954.17---4.17--------- 4.174.17
RI29523.34---23.34--------- 23.3423.34
RI3 Routes70.820.0070.820.000.000.00 70.8270.82
 
SC20141.51---141.51--------- 141.51141.51
SC26220.95---220.95--------- 220.95220.95
SC7775.17---75.179.50------ 84.6784.67
SC85106.28---106.28--------- 106.28106.28
SC95198.76---198.76--------- 198.76198.76
SC1263.68---3.68--------- 3.683.68
SC1852.98---2.98--------- 2.982.98
SC3265.24---5.24--------- 5.245.24
SC3856.21---6.2136.00------ 42.2142.21
SC5268.98---8.9811.20------ 20.1820.18
SC5852.25---2.25--------- 2.252.25
SC11 Routes772.010.00772.0156.700.000.00 828.71828.71
 
SD29252.65---252.65--------- 252.65252.65
SD90412.84---412.84--------- 412.84412.84
SD1901.61---1.61--------- 1.611.61
SD22911.63---11.63--------- 11.6311.63
SD4 Routes678.730.00678.730.000.000.00 678.73678.73
 
TN24175.00---175.00------5.30I-40/65175.00180.30
TN40455.25---455.25--------- 455.25455.25
TN5512.20---12.20--------- 12.2012.20
TN65120.40---120.40------1.00I-40120.40121.40
TN75142.00---142.00------19.60I-40142.00161.60
TN8175.30---75.30--------- 75.3075.30
TN1241.90---1.90--------- 1.901.90
TN140------0.0011.20------ 11.2011.20
TN15516.10---16.10--------- 16.1016.10
TN181------0.0023.80------ 23.8023.80
TN24019.00---19.00--------- 19.0019.00
TN2652.25---2.25--------- 2.252.25
TN2752.90---2.90--------- 2.902.90
TN4407.50---7.50--------- 7.507.50
TN6407.10---7.10--------- 7.107.10
TN15 Routes1,036.900.001,036.9035.000.0025.90 1,071.901,097.80
 
TX10878.21---878.21------2.39I-35878.21880.60
TX20633.98---633.982.00------ 635.98635.98
TX27111.48---111.4812.90------ 124.38124.38
TX30193.70---193.7029.93------ 223.63223.63
TX35406.88---406.88------96.95I-35E406.88503.83
TX35E96.95---96.95--------- 96.9596.95
TX35W85.20---85.20--------- 85.2085.20
TX37143.06---143.06--------- 143.06143.06
TX40177.00---177.00--------- 177.00177.00
TX44------0.0014.70------ 14.7014.70
TX45284.99---284.99--------- 284.99284.99
TX1100.94---0.94--------- 0.940.94
TX3451.26---1.26--------- 1.261.26
TX41039.23---39.239.93------ 49.1649.16
TX61038.01---38.01--------- 38.0138.01
TX63536.94---36.94--------- 36.9436.94
TX82034.75---34.75--------- 34.7534.75
TX17 Routes3,162.580.003,162.5869.460.0099.34 3,232.043,331.38
 
UT15405.49---405.49--------- 405.49405.49
UT70230.77---230.77--------- 230.77230.77
UT80194.27---194.27------3.31I-15194.27197.58
UT8481.20---81.20------35.98I-1581.20117.18
UT21529.59---29.59--------- 29.5929.59
UT5 Routes941.320.00941.320.000.0039.29 941.32980.61
 
VT89130.39---130.39--------- 130.39130.39
VT91177.62---177.62--------- 177.62177.62
VT9311.06---11.06--------- 11.0611.06
VT1891.37---1.37--------- 1.371.37
VT4 Routes320.440.00320.440.000.000.00 320.44320.44
 
VA64268.52---268.52------30.40I-81268.52298.92
VA6675.26---75.26--------- 75.2675.26
VA7758.60---58.60------8.80I-8158.6067.40
VA81324.01---324.01--------- 324.01324.01
VA8568.52---68.52--------- 68.5268.52
VA95150.23---150.2324.08------ 174.31174.31
VA1953.20---3.20--------- 3.203.20
VA26413.17---13.17--------- 13.1713.17
VA29552.86---52.86--------- 52.8652.86
VA3811.17---1.17--------- 1.171.17
VA3959.59---9.59--------- 9.599.59
VA4645.71---5.71--------- 5.715.71
VA49514.39---14.39--------- 14.3914.39
VA5642.94---2.94--------- 2.942.94
VA5816.40---6.40--------- 6.406.40
VA66410.77---10.779.20------ 19.9719.97
VA16 Routes1,065.340.001,065.3433.280.0039.20 1,098.621,137.82
 
WA5276.62---276.62--------- 276.62276.62
WA82132.26---132.26--------- 132.26132.26
WA90297.01---297.01--------- 297.01297.01
WA18215.20---15.20--------- 15.2015.20
WA20510.93---10.93--------- 10.9310.93
WA40530.33---30.33--------- 30.3330.33
WA7051.50---1.50--------- 1.501.50
WA7 Routes763.850.00763.850.000.000.00 763.85763.85
 
WV64122.98---122.98------63.88I-77122.98186.86
WV68------0.0031.80------ 31.8031.80
WV7014.45---14.45--------- 14.4514.45
WV77187.21---187.21--------- 187.21187.21
WV79160.52---160.52--------- 160.52160.52
WV8126.00---26.00--------- 26.0026.00
WV4703.95---3.95--------- 3.953.95
WV7 Routes515.110.00515.1131.800.0063.88 546.91610.79
 
WI39------0.00104.00------ 104.00104.00
WI43119.58---119.5863.00------ 182.58182.58
WI90187.17---187.17--------- 187.17187.17
WI94256.35---256.35--------- 256.35256.35
WI5351.22---1.22--------- 1.221.22
WI7943.75---3.75--------- 3.753.75
WI89410.02---10.02--------- 10.0210.02
WI7 Routes578.090.00578.09167.000.000.00 745.09745.09
 
WY25300.90---300.90--------- 300.90300.90
WY80402.86---402.86--------- 402.86402.86
WY90208.79---208.79--------- 208.79208.79
WY1801.06---1.06--------- 1.061.06
WY4 Routes913.610.00913.610.000.000.00 913.61913.61
GRAND TOTALS42,391.87402.6242,794.492,108.33109.701,081.22  45,012.5246,093.74
Footnote:Overlap mileage is included in the Total Length of each overlap route. The Net Length mileages only include the overlap mileage once, as assigned by the State to the predominant route.
Miles of Interstate Routes by State
(States Sorted Alphabetically)
State Number of Routes "CHARGEABLE" MILES UNDER 23 USC 103(e)"N0N-CHARGEABLE" MILEAGEMileage of Other Overlap Routes TOTAL Length With Overlap Miles NET Length Without Overlap Miles
Original 42,500 Miles (e)(1),(3)Howard-Cramer Additions (e)(2)Subtotal 103(e)Miles Added Title 23 139(a)High Priority Rte Additions per NHS Act
AL10905.200.00905.200.000.00130.101,035.30905.20
AZ61,167.450.001,167.450.000.000.001,167.451,167.45
AR7526.340.00526.3415.930.002.22544.49542.27
CA252,304.517.002,311.51141.800.001.602,454.912,453.31
CO5950.760.00950.760.000.000.00950.76950.76
CT8284.356.69291.0454.690.000.00345.73345.73
DE340.610.0040.610.000.000.0040.6140.61
DC513.650.0013.650.000.000.0013.6513.65
FL121,413.8846.311,460.1911.580.000.001,471.771,471.77
GA151,154.8146.051,200.8636.300.009.211,246.371,237.16
HI451.220.0051.224.100.000.0055.3255.32
ID5611.660.00611.660.000.000.00611.66611.66
IL231,715.100.001,715.10445.030.0066.902,227.032,160.13
IN131,136.550.001,136.5534.630.00174.381,345.561,171.18
IA10782.060.00782.060.000.0027.20809.26782.06
KS9821.180.00821.1850.100.000.00871.28871.28
KY9740.540.00740.5421.200.0026.60788.34761.74
LA12718.84153.18872.0219.550.000.00891.57891.57
ME5315.080.00315.0850.500.000.00365.58365.58
MD16352.9537.59390.5489.370.000.00479.91479.91
MA13449.2112.90462.1199.610.000.00561.72561.72
MI131,174.000.001,174.0066.800.005.201,246.001,240.80
MN9912.700.00912.700.000.0040.15952.85912.70
MS6683.200.00683.200.000.0025.20708.40683.20
MO161,153.350.001,153.3518.990.007.501,179.841,172.34
MT51,187.540.001,187.540.000.007.651,195.191,187.54
NE6481.480.00481.480.000.000.00481.48481.48
NV4543.440.00543.4416.110.000.00559.55559.55
NH5219.010.00219.015.680.000.00224.69224.69
NJ10394.5327.30421.830.000.000.00421.83421.83
NM3999.900.00999.900.000.000.00999.90999.90
NY281,326.9565.601,392.55104.240.000.001,496.791,496.79
NC10847.620.00847.62127.5456.7038.981,070.841,031.86
ND3571.190.00571.190.000.000.00571.19571.19
OH211,530.390.001,530.3935.000.00154.051,719.441,565.39
OK7808.650.00808.65120.650.005.90935.20929.30
OR6720.420.00720.426.890.000.00727.31727.31
PA211,562.750.001,562.75138.8053.0090.771,845.321,754.55
RI370.820.0070.820.000.000.0070.8270.82
SC11772.010.00772.0156.700.000.00828.71828.71
SD4678.730.00678.730.000.000.00678.73678.73
TN151,036.900.001,036.9035.000.0025.901,097.801,071.90
TX173,162.580.003,162.5869.460.0099.343,331.383,232.04
UT5941.320.00941.320.000.0039.29980.61941.32
VT4320.440.00320.440.000.000.00320.44320.44
VA161,065.340.001,065.3433.280.0039.201,137.821,098.62
WA7763.850.00763.850.000.000.00763.85763.85
WV7515.110.00515.1131.800.0063.88610.79546.91
WI7578.090.00578.09167.000.000.00745.09745.09
WY4913.610.00913.610.000.000.00913.61913.61
Grand Total42,391.87402.6242,794.492,108.33109.701,081.2246,093.7445,012.52
1- AND 2-DIGIT INTERSTATE ROUTES AND THEIR LENGTHS (IN MILES)
(As of 12/31/97)
Interstate Route Number"CHARGEABLE" MILEAGE"N0N-CHARGEABLE" MILEAGEMileage of Other Overlapping Routes NET Length Without Overlap TOTAL Length With Overlap
Original 42,500 Miles 23 USC 103(e)(1),(3)Howard-Cramer Additions 23 USC 103(e)(2)Subtotal 103e(1),(2)(3)Miles Added Under 23 USC 139(a)High Priority Route Additions per NHS Act
I-4132.06---132.06---------132.06132.06
I-51,382.04---1,382.04---------1,382.041,382.04
I-8348.32---348.32---------348.32348.32
I-102,455.97---2,455.97------3.992,455.972,459.96
I-1285.59---85.59---------85.5985.59
I-151,436.89---1,436.89---------1,436.891,436.89
I-16165.41---165.41---------165.41165.41
I-17145.24---145.24---------145.24145.24
I-1963.35---63.35---------63.3563.35
I-201,381.01---1,381.012.00---155.301,383.011,538.31
I-24311.22---311.22------5.30311.22316.52
I-251,061.95---1,061.95---------1,061.951,061.95
I-26260.90---260.90---------260.90260.90
I-27111.48---111.4812.90------124.38124.38
I-29743.76---743.76------8.50743.76752.26
I-30336.78---336.7829.93------366.71366.71
I-35/E/W1,694.25---1,694.25------137.181,694.251,831.43
I-37143.06---143.06---------143.06143.06
I-39------0.00223.59------223.59223.59
I-402,422.38---2,422.3891.40---40.512,513.782,554.29
I-43119.58---119.5863.00------182.58182.58
I-44500.20---500.20129.46---4.37629.66634.03
I-45284.99---284.99---------284.99284.99
I-4934.10153.18187.2819.55------206.83206.83
I-55921.77---921.77------21.92921.77943.69
I-57374.98---374.98------5.59374.98380.57
I-59444.02---444.02---------444.02444.02
I-64831.07---831.0714.70---98.42845.77944.19
I-65887.08---887.08------1.00887.08888.08
I-6676.37---76.37---------76.3776.37
I-68------0.00112.10------112.10112.10
I-69284.39---284.3966.80---5.20351.19356.39
I-702,086.11---2,086.11------89.352,086.112,175.46
I-71323.92---323.92------21.66323.92345.58
I-7278.66---78.6694.00------172.66172.66
I-73------0.00---56.70---56.7056.70
I-74390.40---390.40------26.49390.40416.89
I-751,714.6846.311,760.99------26.501,760.991,787.49
I-76 (1)431.87---431.87---------431.87431.87
I-76 (2)186.62---186.62---------186.62186.62
I-77583.55---583.5515.30---8.80598.85607.65
I-78145.34---145.34---------145.34145.34
I-79340.70---340.70------3.55340.70344.25
I-802,854.17---2,854.1735.00---17.602,889.172,906.77
I-81855.10---855.10---------855.10855.10
I-82142.98---142.98---------142.98142.98
I-8384.11---84.11---------84.1184.11
I-84 (3)724.90---724.906.89---35.98731.79767.77
I-84 (4)227.93---227.93---------227.93227.93
I-85659.15---659.15------8.00659.15667.15
I-8663.18---63.18---------63.1863.18
I-87302.95---302.9529.80------332.75332.75
I-88 IL------0.00140.59------140.59140.59
I-88 NY117.77---117.77---------117.77117.77
I-89191.32---191.32---------191.32191.32
I-902,764.22---2,764.2219.61---301.442,783.833,085.27
I-91290.52---290.52---------290.52290.52
I-93174.77---174.7714.10------188.87188.87
I-941,496.15---1,496.15------18.801,496.151,514.95
I-951,831.14---1,831.1461.62------1,892.761,892.76
I-96192.70---192.70---------192.70192.70
I-972.6714.9017.57---------17.5717.57
I-99------0.00---53.00---53.0053.00
H-126.90---26.90---------26.9026.90
H-28.23---8.23---------8.238.23
H-316.09---16.09---------16.0916.09
Totals (5)38,749.01214.3938,963.401,182.34109.701,045.4540,255.4441,300.89
Footnotes:
(1) = I-76 in NJ, OH & PA
(2) = I-76 in CO & NE
(3) = I-84 in ID, OR & UT
(4) = I-84 in CT, MA, NY & PA
(5)  There are 66 1- and 2-digit routes, counting I-35/I-35E/I-35W as 1 route, and counting I-76, I84, and I-88 as 2 routes each.
Overlap mileage is included in the TOTAL length of each overlap route. NET lengths only include the Overlap mileage once, as assigned to the predominant route.
INTERSTATE 3-DIGIT ROUTES AND THEIR LENGTHS (IN MILES)
(As of 12/31/97)
Interstate Route NumberState(s)Mileage Designated Under 103(e)Mileage Designated Under 139(a)Mileage of Other Overlapping RoutesTOTAL Length With OverlapNET Length Without Overlap
105CA17.30------17.3017.30
105OR3.49------3.493.49
110CA20.50------20.5020.50
110FL6.39------6.396.39
110LA8.89------8.898.89
110MS4.30------4.304.30
110TX0.94------0.940.94
115MT1.39------1.391.39
124TN1.90------1.901.90
126SC3.68------3.683.68
129IA, NE3.49------3.493.49
135KS95.74------95.7495.74
140TN---11.20---11.2011.20
155IL---32.06---32.0632.06
155MO, TN26.70------26.7026.70
164IN21.43------21.4321.43
165AL4.90------4.904.90
170MO6.254.29---10.5410.54
172IL---19.00---19.0019.00
175FL---1.44---1.441.44
176PA11.27------11.2711.27
180IL13.19------13.1913.19
180NE3.18------3.183.18
180PA---28.80---28.8028.80
180WY1.06------1.061.06
181TN---23.80---23.8023.80
182WA15.20------15.2015.20
184ID3.52------3.523.52
185GA43.575.50---49.0749.07
185SC2.98------2.982.98
189VT1.37------1.371.37
190IL---3.07---3.073.07
190MA19.10------19.1019.10
190NY28.45------28.4528.45
190SD1.61------1.611.61
194MI3.40------3.403.40
194ND1.19------1.191.19
195FL4.41------4.414.41
195MD3.531.40---4.934.93
195ME1.55------1.551.55
195NJ34.30------34.3034.30
195RI, MA29.5914.28---43.8743.87
195VA3.20------3.203.20
196MI80.60------80.6080.60
205CA13.00------13.0013.00
205OR, WA37.00------37.0037.00
210CA48.60------48.6048.60
210LA12.40------12.4012.40
215CA---54.50---54.5054.50
215UT29.59------29.5929.59
220LA17.60------17.6017.60
220MS11.60------11.6011.60
225CO12.18------12.1812.18
229MO14.60------14.6014.60
229SD11.63------11.6311.63
235IA13.85------13.8513.85
235KS16.53------16.5316.53
235OK3.661.54---5.205.20
238CA---2.10---2.102.10
240NC2.226.92---9.149.14
240OK11.874.35---16.2216.22
240TN19.00------19.0019.00
244OK15.75------15.7515.75
255MO, IL30.70------30.7030.70
264KY22.88------22.8822.88
264VA13.17------13.1713.17
265KY, IN10.0121.20---31.2131.21
265TN2.25------2.252.25
270CO5.20------5.205.20
270MD34.52------34.5234.52
270MO, IL50.57------50.5750.57
270OH55.08------55.0855.08
271OH35.79---5.8441.6335.79
275FL59.58------59.5859.58
275KY, OH, IN79.53---3.4582.9879.53
275MI30.30------30.3030.30
275TN2.90------2.902.90
276PA29.38------29.3829.38
277NC2.691.72---4.414.41
277OH3.62------3.623.62
278NJ, NY35.25------35.2535.25
279PA19.07------19.0719.07
280CA57.10------57.1057.10
280IA, IL17.61---9.3927.0017.61
280NJ18.10------18.1018.10
280OH12.43------12.4312.43
283PA3.07------3.073.07
285GA61.63---1.2162.8461.63
287NJ, NY79.00------79.0079.00
290IL29.84------29.8429.84
290MA19.76------19.7619.76
290NY9.96------9.969.96
291CT5.88------5.885.88
291MA5.53------5.535.53
293NH5.545.68---11.2211.22
294IL48.10---5.3253.4248.10
295DC, MD8.50------8.508.50
295DE, NJ83.01------83.0183.01
295FL35.06------35.0635.06
295ME10.90------10.9010.90
295NY9.00------9.009.00
295RI, MA27.39------27.3927.39
295VA52.86------52.8652.86
296MI3.40------3.403.40
305CA5.30------5.305.30
310LA11.50------11.5011.50
315MT0.82------0.820.82
326SC5.24------5.245.24
335KS---50.10---50.1050.10
345TX1.26------1.261.26
355IL---20.01---20.0120.01
359AL2.30------2.302.30
370MD2.67------2.672.67
375FL---1.34---1.341.34
375MI1.10------1.101.10
376PA14.69------14.6914.69
380CA3.30------3.303.30
380IA73.12------73.1273.12
380PA28.30------28.3028.30
381VA1.17------1.171.17
384CT7.40------7.407.40
385SC6.2136.00---42.2142.21
390NY74.90------74.9074.90
391MA4.68------4.684.68
393NH4.60------4.604.60
394MN10.03------10.0310.03
395CT---54.69---54.6954.69
395FL1.21------1.211.21
395MA---12.29---12.2912.29
395MD0.72------0.720.72
395ME4.74------4.744.74
395VA, DC13.08------13.0813.08
405CA72.40------72.4072.40
405OR3.39------3.393.39
405WA30.33------30.3330.33
410TX39.239.93---49.1649.16
430AR12.93------12.9312.93
435KS, MO78.43------78.4378.43
440AR---9.96---9.969.96
440NC---16.70---16.7016.70
440TN7.50------7.507.50
444OK2.51------2.512.51
459AL32.80------32.8032.80
464VA5.71------5.715.71
465IN53.145.03---58.1758.17
469IN---29.60---29.6029.60
470KS11.45------11.4511.45
470MO16.50------16.5016.50
470OH, WV10.35------10.3510.35
471KY, OH5.34------5.345.34
474IL14.88------14.8814.88
475GA15.59------15.5915.59
475MI16.80------16.8016.80
475OH19.92------19.9219.92
476PA21.25110.00---131.25131.25
478NY---1.90---1.901.90
480NE, IA4.79------4.794.79
480OH42.88------42.8842.88
481NY14.99------14.9914.99
490NY37.97------37.9737.97
490OH1.71------1.711.71
494MN42.73------42.7342.73
495DE11.47------11.4711.47
495MA101.4318.50---119.93119.93
495ME---50.50---50.5050.50
495NY3.6062.70---66.3066.30
495VA, MD29.65------29.6529.65
496MI11.80------11.8011.80
505CA32.90------32.9032.90
510LA3.16------3.163.16
515NV6.0014.90---20.9020.90
516GA---6.40---6.406.40
520GA10.11------10.1110.11
526SC8.9811.20---20.1820.18
535MN, WI2.79------2.792.79
540AR8.135.97---14.1014.10
540NC---5.00---5.005.00
564VA2.94------2.942.94
565AL21.40------21.4021.40
575GA30.86------30.8630.86
579PA1.30------1.301.30
580CA68.407.30---75.7075.70
580NV3.001.21---4.214.21
581VA6.40------6.406.40
585SC2.25------2.252.25
587NY1.40------1.401.40
590NY5.10------5.105.10
595FL4.208.80---13.0013.00
595MD20.11------20.1120.11
605CA27.40------27.4027.40
610LA4.02------4.024.02
610TX38.01------38.0138.01
630AR7.40------7.407.40
635KS, MO12.60------12.6012.60
635TX36.94------36.9436.94
640TN7.10------7.107.10
664VA10.779.20---19.9719.97
670KS, MO1.44------1.441.44
670OH10.68------10.6810.68
675GA10.25------10.2510.25
675MI7.80------7.807.80
675OH25.91------25.9125.91
676PA, NJ7.19------7.197.19
678NY6.307.80---14.1014.10
680CA58.0012.50---70.5070.50
680NE, IA32.97---9.9142.8832.97
680OH16.65------16.6516.65
684NY, CT28.00------28.0028.00
690NY14.60------14.6014.60
691CT8.29------8.298.29
694MN21.98---0.6522.6321.98
695DC1.21------1.211.21
695MD28.582.20---30.7830.78
696MI28.20------28.2028.20
705WA1.50------1.501.50
710CA---19.70---19.7019.70
759AL4.50------4.504.50
780CA6.50------6.506.50
787NY10.50------10.5010.50
790NY2.55------2.552.55
794WI3.75------3.753.75
795MD4.055.47---9.529.52
805CA28.00------28.0028.00
820TX34.75------34.7534.75
878NY0.70------0.700.70
880CA---44.70---44.7044.70
890NY8.90------8.908.90
894WI10.02------10.0210.02
895MD15.00------15.0015.00
895NY1.10------1.101.10
980CA0.801.00---1.801.80
985GA---24.40---24.4024.40
990NY4.142.04---6.186.18
H-201HI---4.10---4.104.10
Totals234 Routes3,831.09925.9935.774,792.854,757.08
Footnotes:
- 103(e) refers to routes designated under Sections 103(e)(1), (2) & (3) of Title 23 U.S.C. Code.
- 139(a) refers to routes designated under Section 139(a) of Title 23 U.S.C. Code.
- Overlap mileage is included in the Total Length of each overlap route.
- NET Mileages only include the overlap mileage once, as assigned by the State to the predominant route.
INTERSTATE LOOPS AND THEIR LENGTHS (IN MILES)
(As of 12/31/97)
Interstate Route NumberState(s)Mileage Designated Under 103(e)Mileage Designated Under 139(a)Mileage of Other Overlapping RoutesTOTAL Length With OverlapNET Length Without Overlap
205CA13.00------13.0013.00
205OR, WA37.00------37.0037.00
210CA48.60------48.6048.60
210LA12.40------12.4012.40
215CA---54.50---54.5054.50
215UT29.59------29.5929.59
220LA17.60------17.6017.60
220MS11.60------11.6011.60
225CO12.18------12.1812.18
229MO14.60------14.6014.60
229SD11.63------11.6311.63
235IA13.85------13.8513.85
235KS16.53------16.5316.53
235OK3.661.54---5.205.20
238CA---2.10---2.102.10
240NC2.226.92---9.149.14
240OK11.874.35---16.2216.22
240TN19.00------19.0019.00
244OK15.75------15.7515.75
255MO, IL30.70------30.7030.70
264KY22.88------22.8822.88
264VA13.17------13.1713.17
265KY, IN10.0121.20---31.2131.21
265TN2.25------2.252.25
270CO5.20------5.205.20
270MD34.52------34.5234.52
270MO, IL50.57------50.5750.57
270OH55.08------55.0855.08
271OH35.79---5.8441.6335.79
275FL59.58------59.5859.58
275KY, OH, IN79.53---3.4582.9879.53
275MI30.30------30.3030.30
275TN2.90------2.902.90
276PA29.38------29.3829.38
277NC2.691.72---4.414.41
277OH3.62------3.623.62
278NJ, NY35.25------35.2535.25
279PA19.07------19.0719.07
280CA57.10------57.1057.10
280IA, IL17.61---9.3927.0017.61
280NJ18.10------18.1018.10
280OH12.43------12.4312.43
283PA3.07------3.073.07
285GA61.63---1.2162.8461.63
287NJ, NY79.00------79.0079.00
290IL29.84------29.8429.84
290MA19.76------19.7619.76
290NY9.96------9.969.96
291CT5.88------5.885.88
291MA5.53------5.535.53
293NH5.545.68---11.2211.22
294IL48.10---5.3253.4248.10
295DC, MD8.50------8.508.50
295DE, NJ83.01------83.0183.01
295FL35.06------35.0635.06
295ME10.90------10.9010.90
295NY9.00------9.009.00
295RI, MA27.39------27.3927.39
295VA52.86------52.8652.86
296MI3.40------3.403.40
405CA72.40------72.4072.40
405OR3.39------3.393.39
405WA30.33------30.3330.33
410TX39.239.93---49.1649.16
430AR12.93------12.9312.93
435KS, MO78.43------78.4378.43
440AR---9.96---9.969.96
440NC---16.70---16.7016.70
440TN7.50------7.507.50
444OK2.51------2.512.51
459AL32.80------32.8032.80
464VA5.71------5.715.71
465IN53.145.03---58.1758.17
469IN---29.60---29.6029.60
470KS11.45------11.4511.45
470MO16.50------16.5016.50
470OH, WV10.35------10.3510.35
471KY, OH5.34------5.345.34
474IL14.88------14.8814.88
475GA15.59------15.5915.59
475MI16.80------16.8016.80
475OH19.92------19.9219.92
476PA21.25110.00---131.25131.25
478NY---1.90---1.901.90
480NE, IA4.79------4.794.79
480OH42.88------42.8842.88
481NY14.99------14.9914.99
490NY37.97------37.9737.97
490OH1.71------1.711.71
494MN42.73------42.7342.73
495DE11.47------11.4711.47
495MA101.4318.50---119.93119.93
495ME---50.50---50.5050.50
495NY3.6062.70---66.3066.30
495VA, MD29.65------29.6529.65
496MI11.80------11.8011.80
605CA27.40------27.4027.40
610LA4.02------4.024.02
610TX38.01------38.0138.01
630AR7.40------7.407.40
635KS, MO12.60------12.6012.60
635TX36.94------36.9436.94
640TN7.10------7.107.10
664VA10.779.20---19.9719.97
670KS, MO1.44------1.441.44
670OH10.68------10.6810.68
675GA10.25------10.2510.25
675MI7.80------7.807.80
675OH25.91------25.9125.91
676PA, NJ7.19------7.197.19
678NY6.307.80---14.1014.10
680CA58.0012.50---70.5070.50
680NE, IA32.97---9.9142.8832.97
680OH16.65------16.6516.65
684NY, CT28.00------28.0028.00
690NY14.60------14.6014.60
691CT8.29------8.298.29
694MN21.98---0.6522.6321.98
695DC1.21------1.211.21
695MD28.582.20---30.7830.78
696MI28.20------28.2028.20
805CA28.00------28.0028.00
820TX34.75------34.7534.75
878NY0.70------0.700.70
880CA---44.70---44.7044.70
890NY8.90------8.908.90
894WI10.02------10.0210.02
895MD15.00------15.0015.00
895NY1.10------1.101.10
H-201HI---4.10---4.104.10
Totals130 Loops2,741.47493.3335.773,270.573,234.80
Footnotes:
- 103(e) refers to routes designated under Sections 103(e)(1), (2) & (3) of Title 23 U.S.C. Code.
- 139(a) refers to routes designated under Section 139(a) of Title 23 U.S.C. Code.
- Overlap mileage is included in the Total Length of each overlap route.
- NET Mileages only include the overlap mileage once, as assigned by the State to the predominant route.
INTERSTATE SPURS AND THEIR LENGTHS (IN MILES)
(As of 12/31/97)
Interstate Route NumberState(s)Mileage Designated Under 103(e)Mileage Designated Under 139(a)Mileage of Other Overlapping RoutesTOTAL Length With OverlapNET Length Without Overlap
105CA17.30------17.3017.30
105OR3.49------3.493.49
110CA20.50------20.5020.50
110FL6.39------6.396.39
110LA8.89------8.898.89
110MS4.30------4.304.30
110TX0.94------0.940.94
115MT1.39------1.391.39
124TN1.90------1.901.90
126SC3.68------3.683.68
129IA, NE3.49------3.493.49
135KS95.74------95.7495.74
140TN---11.20---11.2011.20
155IL---32.06---32.0632.06
155MO, TN26.70------26.7026.70
164IN21.43------21.4321.43
165AL4.90------4.904.90
170MO6.254.29---10.5410.54
172IL---19.00---19.0019.00
175FL---1.44---1.441.44
176PA11.27------11.2711.27
180IL13.19------13.1913.19
180NE3.18------3.183.18
180PA---28.80---28.8028.80
180WY1.06------1.061.06
181TN---23.80---23.8023.80
182WA15.20------15.2015.20
184ID3.52------3.523.52
185GA43.575.50---49.0749.07
185SC2.98------2.982.98
189VT1.37------1.371.37
190IL---3.07---3.073.07
190MA19.10------19.1019.10
190NY28.45------28.4528.45
190SD1.61------1.611.61
194MI3.40------3.403.40
194ND1.19------1.191.19
195FL4.41------4.414.41
195MD3.531.40---4.934.93
195ME1.55------1.551.55
195NJ34.30------34.3034.30
195RI, MA29.5914.28---43.8743.87
195VA3.20------3.203.20
196MI80.60------80.6080.60
305CA5.30------5.305.30
310LA11.50------11.5011.50
315MT0.82------0.820.82
326SC5.24------5.245.24
335KS---50.10---50.1050.10
345TX1.26------1.261.26
355IL---20.01---20.0120.01
359AL2.30------2.302.30
370MD2.67------2.672.67
375FL---1.34---1.341.34
375MI1.10------1.101.10
376PA14.69------14.6914.69
380CA3.30------3.303.30
380IA73.12------73.1273.12
380PA28.30------28.3028.30
381VA1.17------1.171.17
384CT7.40------7.407.40
385SC6.2136.00---42.2142.21
390NY74.90------74.9074.90
391MA4.68------4.684.68
393NH4.60------4.604.60
394MN10.03------10.0310.03
395CT---54.69---54.6954.69
395FL1.21------1.211.21
395MA---12.29---12.2912.29
395MD0.72------0.720.72
395ME4.74------4.744.74
395VA, DC13.08------13.0813.08
505CA32.90------32.9032.90
510LA3.16------3.163.16
515NV6.0014.90---20.9020.90
516GA---6.40---6.406.40
520GA10.11------10.1110.11
526SC8.9811.20---20.1820.18
535MN, WI2.79------2.792.79
540AR8.135.97---14.1014.10
540NC---5.00---5.005.00
564VA2.94------2.942.94
565AL21.40------21.4021.40
575GA30.86------30.8630.86
579PA1.30------1.301.30
580CA68.407.30---75.7075.70
580NV3.001.21---4.214.21
581VA6.40------6.406.40
585SC2.25------2.252.25
587NY1.40------1.401.40
590NY5.10------5.105.10
595FL4.208.80---13.0013.00
595MD20.11------20.1120.11
705WA1.50------1.501.50
710CA---19.70---19.7019.70
759AL4.50------4.504.50
780CA6.50------6.506.50
787NY10.50------10.5010.50
790NY2.55------2.552.55
794WI3.75------3.753.75
795MD4.055.47---9.529.52
980CA0.801.00---1.801.80
985GA---24.40---24.4024.40
990NY4.142.04---6.186.18
Totals104 Spurs1,089.62432.660.001,522.281,522.28
Footnotes:
- 103(e) refers to routes designated under Sections 103(e)(1), (2) & (3) of Title 23 U.S.C. Code.
- 139(a) refers to routes designated under 23 U.S.C. 139(a).
- There are no other Interstate routes which overlap Interstate spur routes.


Interstate System Mileage By Urbanized Area
1New York - Northeastern New Jersey460
2Chicago - Northwestern Indiana422
3Los Angeles373
4Dallas - Fort Worth286
5St. Louis245
6Atlanta238
7Detroit203
8San Francisco - Oakland202
9Kansas City201
10Minneapolis - St. Paul194
11Philadelphia190
12Cleveland176
13Washington, DC (MD, VA)170
14Pittsburgh166
Note: Urbanized areas with at least 150 centerline miles on the Dwight D. Eisenhower System of Interstate and Defense Highways
Source: FHWA's 1996 Highway Statistics Table HM-71, pages V-80 thru V-85.
Updated: 10/15/2013
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000