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Highway Statistics 2007

National Highway System Length - 2007 Miles by Measured Pavement Roughness

October 2008
Sheet 1 OF 4
Table HM-47

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STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
INTERSTATE SYSTEM OTHER
NOT REPORTED 2/ < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED NOT REPORTED 2/ < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama - 428 88 - 11 1 11 - 4 543 5 792 1,077 128 23 8 3 1 1 2,033
Alaska - 25 234 429 204 59 53 8 - 1,012 176 64 193 99 155 76 48 72 107 814
Arizona - 580 347 38 11 2 3 - - 981 5 509 356 137 62 36 7 2 1 1,110
Arkansas 1 175 188 55 16 8 11 4 3 460 5 157 847 498 198 85 25 9 4 1,823
California - 93 533 193 169 84 68 75 66 1,281 4 142 1,675 805 462 164 108 41 10 3,407
Colorado - 80 303 155 90 40 17 - - 685 - 152 980 373 259 42 35 9 14 1,864
Connecticut - - 31 10 1 1 - - - 43 - 6 44 52 38 15 1 1 1 158
Delaware - - - - - - - - - - - 2 103 62 1 2 - - - 170
Dist. of Columbia - - - - - - - - - - - - - - - - - - - -
Florida 2 479 267 - - - - - - 746 7 621 759 100 19 - - - - 1,499
Georgia 144 307 237 24 3 - - - - 571 174 1,879 1,047 46 5 1 - - - 2,978
Hawaii - - - - 6 - - - - 6 - - 12 21 30 28 4 6 3 104
Idaho - 15 372 87 34 10 - 3 - 521 5 60 990 375 157 51 15 2 2 1,652
Illinois - 391 678 198 78 12 - - - 1,357 - 55 662 409 250 165 73 32 14 1,660
Indiana 3/ - 69 436 166 30 6 - - - 707 1 342 645 177 98 47 5 5 - 1,319
Iowa - 102 280 154 62 20 5 3 2 628 25 254 733 469 279 154 69 33 21 2,012
Kansas 10 302 276 65 3 - - - - 646 32 512 1,648 327 35 19 3 2 2 2,548
Kentucky 2 203 275 25 36 12 - - - 551 3 570 912 150 90 12 2 1 - 1,737
Louisiana 59 163 140 76 60 1 13 16 6 475 12 86 391 223 124 107 39 26 22 1,018
Maine - 82 161 37 19 - - - - 299 - 85 350 149 85 56 34 15 18 792
Maryland 1 65 109 7 1 - - - - 182 8 146 223 54 17 10 2 1 1 454
Massachusetts - 14 38 23 - 16 - - - 91 - 4 41 76 34 8 4 - - 167
Michigan - 175 265 52 59 43 - 13 1 608 - 810 912 262 83 47 22 2 7 2,145
Minnesota 4/ - 83 299 113 105 47 9 5 - 661 - 591 994 452 257 204 51 18 7 2,574
Mississippi - 81 317 43 33 14 4 - 1 493 - 275 935 183 197 63 24 22 6 1,705
Missouri - 315 380 19 4 3 - - - 721 - 400 1,044 412 283 176 72 31 9 2,427
Montana - 455 584 27 40 20 4 - - 1,130 - 624 1,467 374 108 37 2 4 1 2,617
Nebraska - 240 132 31 11 6 - - - 420 - 474 946 400 259 91 90 29 19 2,308
Nevada - 387 24 23 13 4 - - - 451 1 1,121 281 12 1 1 1 - 2 1,419
New Hampshire - 66 69 12 1 - - - 1 149 - 94 217 47 30 13 2 2 7 412
New Jersey - 7 23 14 12 5 1 3 - 65 - 4 65 47 95 31 12 4 2 260
New Mexico - 499 285 55 4 3 - - - 846 - 921 469 197 98 21 3 1 1 1,711
New York 2 128 447 120 31 42 37 20 7 832 6 115 794 337 138 63 21 15 33 1,516
North Carolina - 78 308 63 47 28 16 1 - 541 - 206 1,169 372 148 43 23 8 1 1,970
North Dakota - 189 250 59 15 6 - - - 519 - 528 813 388 210 114 26 - 10 2,089
Ohio - 260 371 65 17 7 1 2 1 724 - 258 909 264 144 61 8 2 4 1,650
Oklahoma - 188 351 94 22 21 7 - - 683 1 246 784 506 229 121 81 71 59 2,097
Oregon - 41 457 55 1 - - - - 554 1 285 1,390 555 276 72 22 5 11 2,616
Pennsylvania 1 387 459 150 56 13 3 1 1 1,070 25 134 811 492 211 103 27 9 4 1,791
Rhode Island - 1 21 - - - - - - 22 - - 2 7 11 9 7 7 5 48
South Carolina - 218 225 76 33 27 1 - - 580 - 45 737 203 91 26 2 2 2 1,108
South Dakota - 78 330 155 34 5 - - - 602 2 341 1,060 364 208 72 47 61 31 2,184
Tennessee - 574 96 9 2 6 - 1 1 689 - 650 626 113 32 8 3 2 4 1,438
Texas 89 428 1,262 265 95 32 8 1 - 2,091 10 645 3,240 1,782 535 132 44 4 1 6,383
Utah - 172 378 112 26 28 - 6 1 723 - 26 377 230 161 69 37 17 6 923
Vermont - 127 121 17 5 1 4 4 - 279 - 12 189 41 25 35 9 4 5 320
Virginia - 90 521 37 16 2 - - - 666 - 38 854 301 95 29 16 3 1 1,337
Washington - 132 178 44 55 47 11 - - 467 - 279 1,217 309 114 40 51 2 14 2,026
West Virginia - 23 254 48 27 18 - 1 5 376 - 30 462 270 143 70 20 12 9 1,016
Wisconsin - 86 210 113 42 12 6 9 - 478 - 650 899 513 243 98 28 23 8 2,462
Wyoming - 188 455 139 16 6 - 10 1 815 5 146 959 621 169 49 1 10 1 1,956
U.S. Total 311 9,269 14,065 3,752 1,656 718 293 186 101 30,040 513 16,386 38,310 14,784 7,015 2,984 1,229 628 491 81,827
Puerto Rico 1 - - 8 4 8 4 6 - 30 2 - 1 1 17 - 5 2 2 28
Grand Total 312 9,269 14,065 3,760 1,660 726 297 192 101 30,070 515 16,386 38,311 14,785 7,032 2,984 1,234 630 493 81,855

October 2008
Sheet 2 OF 4
Table HM-47

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
TOTAL RURAL NHS
NOT REPORTED 2/ < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 5 1,220 1,165 128 34 10 14 1 5 2,577
Alaska 176 89 427 528 359 136 101 80 107 1,827
Arizona 5 1,090 703 174 72 38 10 2 1 2,090
Arkansas 6 331 1,035 553 214 94 36 13 7 2,283
California 4 235 2,208 998 632 248 176 116 77 4,690
Colorado - 232 1,283 527 349 83 52 9 14 2,549
Connecticut - 6 74 62 39 16 1 1 1 200
Delaware - 2 103 62 1 2 - - - 170
Dist. of Columbia - - - - - - - - - -
Florida 9 1,101 1,027 100 19 - - - - 2,247
Georgia 318 2,186 1,285 69 8 1 - - - 3,549
Hawaii - - 12 21 36 28 4 6 3 110
Idaho 5 75 1,362 462 192 61 15 4 2 2,173
Illinois - 446 1,340 607 328 177 73 32 14 3,017
Indiana 3/ 1 411 1,081 343 127 53 5 5 - 2,025
Iowa 26 355 1,013 622 341 174 74 37 23 2,639
Kansas 42 814 1,924 392 38 19 3 2 2 3,194
Kentucky 4 773 1,186 175 126 24 2 1 - 2,287
Louisiana 70 249 531 299 184 108 52 42 28 1,493
Maine - 168 511 186 104 56 34 15 18 1,092
Maryland 10 211 332 61 18 10 2 2 1 637
Massachusetts - 18 79 99 34 24 4 - - 258
Michigan - 985 1,176 314 142 89 22 16 8 2,752
Minnesota 4/ - 674 1,293 565 362 251 60 23 7 3,235
Mississippi - 356 1,252 226 230 77 28 22 7 2,198
Missouri - 716 1,424 431 287 179 72 31 9 3,149
Montana - 1,078 2,051 401 148 56 6 4 1 3,745
Nebraska - 714 1,078 431 270 97 90 29 19 2,728
Nevada 1 1,509 305 34 14 4 1 - 2 1,869
New Hampshire - 160 285 59 32 14 2 2 8 562
New Jersey - 10 88 61 107 37 13 7 2 325
New Mexico - 1,419 753 251 102 24 3 1 1 2,554
New York 8 243 1,241 457 169 106 58 36 41 2,351
North Carolina - 285 1,476 435 195 71 39 9 2 2,512
North Dakota - 717 1,063 447 225 120 26 - 10 2,608
Ohio - 517 1,280 330 161 68 9 3 5 2,373
Oklahoma 1 435 1,135 600 252 142 88 71 59 2,782
Oregon 1 327 1,847 610 278 72 22 5 11 3,172
Pennsylvania 26 521 1,270 642 266 117 30 10 6 2,862
Rhode Island - 1 22 7 11 9 7 7 5 69
South Carolina - 263 962 279 124 53 3 2 2 1,688
South Dakota 2 420 1,390 519 242 77 47 61 31 2,787
Tennessee - 1,223 722 122 34 14 3 2 5 2,125
Texas 100 1,072 4,502 2,047 631 164 52 5 1 8,474
Utah - 199 756 342 188 96 37 23 8 1,649
Vermont - 140 310 57 30 36 14 8 5 600
Virginia - 127 1,375 338 111 31 16 3 1 2,002
Washington - 412 1,395 352 169 87 62 2 14 2,493
West Virginia - 53 716 318 171 88 20 13 14 1,393
Wisconsin - 737 1,108 627 285 109 34 33 8 2,941
Wyoming 5 334 1,415 760 185 55 1 20 2 2,772
U.S. Total 825 25,659 52,371 18,530 8,676 3,705 1,523 816 597 111,877
Puerto Rico 3 - 1 9 21 8 9 7 2 57
Grand Total 828 25,659 52,372 18,539 8,697 3,713 1,532 823 599 111,934

October 2008
Sheet 3 OF 4
Table HM-47

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
INTERSTATE SYSTEM OTHER
NOT REPORTED 1/ < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED NOT REPORTED 2/ < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 18 204 75 19 11 21 8 5 2 345 32 275 315 68 31 10 3 2 4 708
Alaska - 12 33 13 6 3 - 1 - 68 4 5 13 21 16 5 9 2 2 73
Arizona - 70 76 28 13 1 - - - 188 18 140 123 56 77 38 18 9 4 465
Arkansas - 24 93 32 17 16 8 2 4 196 4 12 79 48 35 34 22 14 14 258
California 2 24 284 212 224 142 98 95 98 1,177 2 21 389 386 399 232 159 70 125 1,781
Colorado - 15 110 73 37 19 11 3 - 268 - 29 230 174 156 72 41 21 26 749
Connecticut - 27 145 69 36 11 7 4 3 302 - 13 106 140 87 51 21 20 22 460
Delaware 1 - 25 8 2 3 1 1 - 40 - 1 49 43 21 7 1 1 3 126
Dist. of Columbia - - - - 5 2 - 2 3 12 - - - 2 4 4 4 9 45 68
Florida 3 342 352 17 6 1 1 - - 719 5 335 779 149 54 27 9 8 12 1,373
Georgia 83 313 103 23 4 2 - - - 445 61 475 486 71 16 11 5 - 2 1,066
Hawaii - - 10 6 8 12 4 3 5 48 - 14 31 30 35 31 27 11 13 192
Idaho 1 4 51 21 1 - 4 2 7 90 1 6 28 25 14 8 4 2 6 93
Illinois - 121 264 211 114 64 27 8 4 813 - 30 206 365 374 293 197 171 270 1,906
Indiana 3/ - 28 228 115 49 32 5 4 4 465 4 14 136 64 81 45 27 10 12 389
Iowa 1 12 62 33 18 13 7 5 2 152 30 18 104 83 53 39 26 21 31 375
Kansas 20 30 84 59 22 2 1 - - 198 8 14 196 63 23 9 5 1 9 320
Kentucky - 62 65 49 23 9 - 1 - 209 1 47 179 79 38 24 7 8 7 389
Louisiana 53 52 82 53 53 54 11 7 5 317 38 22 149 136 74 58 79 39 79 636
Maine - 9 38 13 6 - 1 - - 67 - 8 35 35 15 13 11 9 10 136
Maryland 10 59 144 35 17 10 9 6 9 289 11 72 186 84 48 28 15 16 60 509
Massachusetts 5 92 234 92 24 33 1 1 - 477 3 63 211 165 194 215 135 121 124 1,228
Michigan 1 66 255 140 74 52 19 18 10 634 - 109 315 257 189 147 128 97 136 1,378
Minnesota 4/ - 15 111 56 45 21 2 - 3 253 - 37 181 112 90 45 18 7 5 495
Mississippi - 24 90 36 23 16 5 3 10 207 - 37 160 83 56 45 27 14 11 433
Missouri - 129 249 43 20 7 4 4 3 459 14 111 346 151 105 36 27 11 10 797
Montana - 16 35 3 4 1 2 - - 61 - 4 18 15 12 6 4 4 3 66
Nebraska - 5 34 7 5 7 3 1 1 63 1 9 22 17 55 60 40 35 41 279
Nevada - 53 28 19 9 9 1 - - 119 1 66 56 17 8 2 2 1 2 154
New Hampshire - 34 32 4 - - - - 7 77 - 43 79 26 9 6 3 4 3 173
New Jersey 5 33 102 90 47 25 34 16 14 361 16 16 216 295 272 214 119 88 154 1,374
New Mexico - 42 86 17 8 3 - - - 156 - 26 105 27 34 15 8 4 8 227
New York 34 71 371 145 81 62 37 24 27 818 40 35 424 427 338 200 149 65 298 1,936
North Carolina - 75 271 129 55 21 11 4 1 567 - 48 415 194 82 36 17 8 9 809
North Dakota - 10 33 8 1 - - - - 52 - 1 13 23 18 7 3 3 - 68
Ohio - 154 435 145 77 23 10 3 2 849 - 91 511 247 163 84 54 36 41 1,227
Oklahoma 1 48 109 29 22 14 7 7 13 249 - 28 139 52 45 29 18 25 31 367
Oregon 2 25 114 22 10 1 - - - 172 1 27 160 79 50 33 24 12 18 403
Pennsylvania 13 123 323 143 52 18 10 3 1 673 39 115 519 489 348 226 111 55 44 1,907
Rhode Island - 9 25 14 1 - - - - 49 - - 35 40 27 17 11 8 14 152
South Carolina - 78 125 37 15 5 1 1 - 262 - 16 263 161 103 59 29 18 24 673
South Dakota - 8 23 25 13 3 4 - - 76 2 1 11 15 13 16 8 5 3 72
Tennessee - 213 151 28 14 6 3 1 1 417 - 224 282 111 71 30 10 8 20 756
Texas 8 47 424 258 179 85 41 9 3 1,046 26 87 942 914 664 416 261 153 230 3,667
Utah - 57 84 29 26 12 4 - - 212 16 34 112 42 28 21 7 1 4 249
Vermont - 6 15 10 1 2 7 - - 41 - - 18 9 8 8 4 3 3 53
Virginia 7 22 195 102 70 43 8 3 2 445 34 20 337 278 121 101 55 40 38 990
Washington - 81 125 40 12 27 7 2 2 296 - 52 264 104 73 33 15 29 51 621
West Virginia - 23 93 32 12 11 5 1 - 177 - 19 91 36 33 15 10 12 10 226
Wisconsin 3 28 95 80 32 13 13 1 - 262 26 43 211 202 167 116 80 70 70 959
Wyoming - 15 31 26 9 11 2 - 3 97 - 4 36 20 11 4 1 1 4 81
U.S. Total 271 3,010 6,622 2,898 1,613 948 444 251 249 16,035 438 2,917 10,311 6,730 5,038 3,281 2,068 1,382 2,165 33,892
Puerto Rico 1 - 10 47 53 63 24 24 10 231 4 - 3 17 14 27 23 11 15 110
Grand Total 272 3,010 6,632 2,945 1,666 1,011 468 275 259 16,266 442 2,917 10,314 6,747 5,052 3,308 2,091 1,393 2,180 34,002

October 2008
Sheet 4 OF 4
Table HM-47

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
TOTAL URBAN NHS
NOT REPORTED 2/ < 60 60-94 95-119 120-144 145-170 171-194 195-220 > 220 TOTAL REPORTED
Alabama 50 479 390 87 42 31 11 7 5 1,052
Alaska 4 17 46 34 22 9 9 2 2 141
Arizona 18 210 198 84 90 38 18 9 4 651
Arkansas 4 36 171 81 52 50 30 16 18 454
California 4 45 673 597 623 373 257 165 222 2,955
Colorado - 45 340 247 193 91 52 24 26 1,018
Connecticut - 40 251 209 123 62 28 24 25 762
Delaware 1 1 74 51 23 11 2 2 3 167
Dist. of Columbia - - - 2 9 6 5 11 49 82
Florida 8 677 1,131 166 60 29 10 8 12 2,093
Georgia 144 788 589 94 21 13 5 - 2 1,512
Hawaii - 14 42 37 43 44 31 14 18 243
Idaho 2 11 80 46 15 8 8 4 12 184
Illinois - 151 470 576 488 357 223 178 274 2,717
Indiana 3/ 4 43 364 178 130 77 33 14 16 855
Iowa 32 30 167 116 71 52 33 25 33 527
Kansas 28 43 280 122 45 11 6 1 9 517
Kentucky 1 109 244 128 61 32 7 9 7 597
Louisiana 92 74 231 189 127 112 90 46 83 952
Maine - 18 74 48 22 13 11 9 10 205
Maryland 21 131 330 118 65 38 24 21 69 796
Massachusetts 9 156 445 257 217 248 136 122 124 1,705
Michigan 1 175 569 397 263 199 148 115 146 2,012
Minnesota 4/ - 52 292 169 135 66 20 7 8 749
Mississippi - 62 251 119 78 60 32 17 21 640
Missouri 14 240 595 194 125 43 32 15 13 1,257
Montana - 20 54 18 16 7 7 4 4 130
Nebraska 1 14 56 23 60 67 43 36 42 341
Nevada 1 119 84 36 17 11 3 1 2 273
New Hampshire - 77 111 30 9 6 3 4 10 250
New Jersey 21 49 318 385 318 239 152 104 168 1,733
New Mexico - 68 192 43 41 18 8 4 8 382
New York 75 105 795 572 419 262 186 89 325 2,753
North Carolina - 123 686 324 137 57 28 12 10 1,377
North Dakota - 11 46 31 19 7 3 3 - 120
Ohio - 244 947 392 240 108 64 39 43 2,077
Oklahoma 1 76 248 81 66 43 26 32 44 616
Oregon 4 51 274 101 61 34 24 12 18 575
Pennsylvania 52 238 842 632 400 244 121 58 45 2,580
Rhode Island - 9 60 55 28 17 12 8 14 203
South Carolina - 94 388 199 118 64 30 19 24 936
South Dakota 2 8 34 40 26 19 12 5 3 147
Tennessee - 437 433 139 85 36 12 9 21 1,172
Texas 33 133 1,367 1,172 843 500 302 162 233 4,712
Utah 16 91 195 71 53 34 12 1 4 461
Vermont - 6 33 18 9 10 11 3 3 93
Virginia 41 41 532 380 191 144 63 43 41 1,435
Washington - 133 389 144 85 60 23 31 54 919
West Virginia - 42 183 68 45 26 15 13 10 402
Wisconsin 30 70 306 282 199 129 93 71 70 1,220
Wyoming - 19 67 46 20 15 3 1 8 179
U.S. Total 714 5,925 16,937 9,628 6,648 4,230 2,517 1,629 2,415 49,929
Puerto Rico 5 - 14 64 68 90 48 35 26 345
Grand Total 719 5,925 16,951 9,692 6,716 4,320 2,565 1,664 2,441 50,274

1/ Data are reported as the International Roughness Index (IRI) in inches per mile. Reference: World Bank Technical Paper Number 46, 1986. Lower IRI represents smoother riding roadways. To obtain a comprehensive assessment of pavement condition, additional measures of pavement distress are needed.

2/ May include sections entirely on structures and unpaved miles.

3/ Excludes 788 miles of Federal agency owned roads.

4/ Excludes 437 miles of local government owned roads.

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Updated: 01/03/2012

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United States Department of Transportation - Federal Highway Administration