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Highway Statistics 2008

National Highway System Length - 2008 Miles by Measured Pavement Roughness

October 2009
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 2 403 92 19 11 - 12 - - 537 19 892 1,011 92 18 1 - - - 2,014
Alaska - 25 207 387 262 24 83 23 3 1,014 308 27 121 78 160 96 72 73 53 680
Arizona - 561 376 37 5 3 - - - 982 5 509 347 121 92 32 7 1 1 1,110
Arkansas 1 256 131 25 12 9 10 2 2 447 9 146 881 468 205 76 25 10 12 1,823
California - 93 533 193 169 84 68 75 66 1,281 4 142 1,691 775 437 160 108 41 10 3,364
Colorado - 81 274 160 106 43 18 - - 682 - 142 935 476 165 67 47 14 13 1,859
Connecticut - 1 38 3 - 1 - - - 43 - 4 50 53 36 11 2 - 1 157
Delaware - - - - - - - - - - - 2 103 62 1 2 - - - 170
Dist. of Columbia - - - - - - - - - - - - - - - - - - - -
Florida - 498 251 - - - - - - 749 - 560 822 95 13 17 - 4 - 1,511
Georgia 34 367 241 71 2 - - - - 681 33 1,981 1,089 40 6 5 - 2 1 3,124
Hawaii - - - - 6 - - - - 6 - - 12 21 28 31 5 6 3 106
Idaho - 74 353 46 36 6 5 2 - 522 3 90 1,055 337 92 49 27 3 2 1,655
Illinois - 467 633 190 56 10 - - - 1,356 - 90 662 440 202 159 69 25 13 1,660
Indiana 3/ - 69 436 166 30 6 - - - 707 - 306 610 165 87 37 5 6 - 1,216
Iowa - 111 272 150 56 25 6 4 4 628 15 260 680 479 306 168 76 41 23 2,033
Kansas 10 110 439 81 16 - - - - 646 37 224 1,709 513 78 11 5 1 1 2,542
Kentucky - 221 270 28 27 8 - - - 554 - 550 938 132 93 16 1 1 3 1,734
Louisiana 59 100 198 83 48 41 - 1 6 477 12 48 488 238 88 91 44 37 8 1,042
Maine - 70 165 46 17 - - - - 298 - 88 369 146 67 45 35 24 19 793
Maryland 1 67 104 10 1 - - - - 182 8 153 224 39 23 9 2 2 2 454
Massachusetts - 17 62 12 - - - - - 91 - 9 40 72 34 6 5 - 1 167
Michigan - 168 265 54 55 48 4 13 1 608 - 808 928 235 97 40 24 3 7 2,142
Minnesota 4 100 279 89 88 51 1 17 5 630 23 455 1,058 512 260 123 85 5 5 2,503
Mississippi - 58 330 36 42 17 4 2 1 490 - 157 948 276 192 64 30 18 6 1,691
Missouri - 325 388 3 2 4 - - - 722 - 472 1,240 396 200 98 17 4 1 2,428
Montana - 455 584 27 40 20 4 - - 1,130 - 573 1,484 365 130 52 10 1 - 2,615
Nebraska - 208 171 31 11 - - - - 421 - 490 985 390 220 119 46 38 22 2,310
Nevada - 384 23 20 12 4 - - - 443 - 1,002 390 10 12 2 - - 4 1,420
New Hampshire - 69 54 23 4 - - - - 150 - 76 193 67 32 19 14 4 2 407
New Jersey - 7 23 14 12 5 1 3 - 65 - 4 65 47 94 31 12 4 2 259
New Mexico - 499 285 55 4 3 - - - 846 - 921 469 197 98 21 3 1 1 1,711
New York 2 126 502 90 42 28 29 18 4 839 28 104 842 341 114 52 9 8 11 1,481
North Carolina - 115 284 60 36 38 8 1 - 542 - 249 1,105 433 113 36 13 4 2 1,955
North Dakota - 201 266 37 14 - - - - 518 - 527 928 284 208 101 36 3 2 2,089
Ohio - 260 375 63 11 11 1 2 1 724 3 268 895 259 141 64 14 5 7 1,653
Oklahoma - 154 358 99 38 17 12 6 - 684 - 248 909 491 185 111 68 50 36 2,098
Oregon - 29 340 169 14 2 - - - 554 - 218 1,474 565 252 79 21 5 5 2,619
Pennsylvania 1 461 428 154 36 13 2 1 1 1,096 3 238 824 385 200 96 27 11 7 1,788
Rhode Island - 1 21 - - - - - - 22 - - 2 7 11 9 7 7 5 48
South Carolina - 207 220 85 37 31 1 - - 581 - 34 668 250 123 26 2 1 2 1,106
South Dakota - 72 340 144 40 5 - - - 601 2 436 1,034 321 192 79 42 41 39 2,184
Tennessee - 560 115 8 2 1 - 1 - 687 - 604 736 132 34 10 2 2 4 1,524
Texas - 501 1,307 191 39 19 1 - - 2,058 18 612 3,264 1,604 584 68 14 19 2 6,167
Utah 3 173 376 111 26 28 - 6 1 721 11 25 380 249 172 65 45 17 6 959
Vermont - 140 120 12 2 1 - 4 - 279 - 9 178 65 32 19 8 6 3 320
Virginia - 89 524 37 16 2 - - - 668 - 38 842 299 95 29 16 3 1 1,323
Washington - 145 154 47 60 50 10 - - 466 - 223 1,234 367 118 47 23 10 2 2,024
West Virginia - 42 226 43 27 11 - 1 5 355 - 50 451 270 164 70 19 11 11 1,046
Wisconsin - 113 193 101 41 14 7 9 - 478 - 662 875 499 269 96 31 21 8 2,461
Wyoming - 185 471 125 32 1 1 - - 815 5 151 983 569 175 36 34 1 6 1,955
U.S. Total 117 9,438 14,097 3,635 1,643 684 288 191 100 30,076 546 15,877 39,221 14,727 6,748 2,751 1,207 594 375 81,500
Puerto Rico - - 1 9 8 8 2 1 3 32 - - 1 4 14 - 9 - 2 30
Grand Total 117 9,438 14,098 3,644 1,651 692 290 192 103 30,108 546 15,877 39,222 14,731 6,762 2,751 1,216 594 377 81,530

October 2009
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 21 1,296 1,102 111 29 1 13 - - 2,552
Alaska 308 52 328 465 422 120 155 96 56 1,694
Arizona 5 1,070 723 158 96 35 7 1 1 2,091
Arkansas 11 401 1,013 493 217 86 35 12 13 2,270
California 4 235 2,224 968 606 244 176 116 77 4,646
Colorado - 223 1,209 637 270 110 64 14 13 2,540
Connecticut - 5 87 57 36 13 2 - 1 201
Delaware - 2 103 62 1 2 - - - 170
Dist. of Columbia - - - - - - - - - -
Florida - 1,058 1,072 95 13 17 - 4 - 2,259
Georgia 67 2,348 1,331 111 8 5 - 2 1 3,806
Hawaii - - 12 21 34 31 5 6 3 112
Idaho 3 164 1,407 383 128 55 32 5 2 2,176
Illinois - 557 1,295 630 258 169 69 25 13 3,016
Indiana 3/ - 375 1,046 331 116 43 5 6 - 1,922
Iowa 15 371 952 629 362 193 82 45 27 2,661
Kansas 47 334 2,148 594 94 11 5 1 1 3,188
Kentucky - 771 1,208 160 119 25 1 1 3 2,288
Louisiana 71 148 685 321 136 133 44 38 14 1,519
Maine - 158 534 192 84 45 36 24 19 1,092
Maryland 10 220 327 49 25 9 2 2 2 636
Massachusetts - 26 103 83 34 6 5 - 1 258
Michigan - 976 1,193 289 152 88 28 16 8 2,750
Minnesota 26 555 1,337 601 347 174 86 22 10 3,132
Mississippi - 216 1,278 312 234 82 33 20 7 2,182
Missouri - 798 1,628 398 202 102 17 4 1 3,150
Montana - 1,028 2,067 392 170 72 14 1 - 3,744
Nebraska - 698 1,155 420 231 119 46 38 22 2,729
Nevada - 1,386 412 30 24 6 - - 4 1,862
New Hampshire - 145 247 90 36 19 14 4 2 557
New Jersey - 10 88 61 106 37 13 7 2 324
New Mexico - 1,419 753 251 102 24 3 1 1 2,554
New York 30 231 1,344 431 156 80 38 26 15 2,321
North Carolina - 364 1,389 493 149 75 21 4 2 2,497
North Dakota - 728 1,194 321 223 101 36 3 2 2,608
Ohio 3 528 1,270 322 152 76 14 7 7 2,376
Oklahoma - 402 1,267 590 224 128 80 56 36 2,783
Oregon - 247 1,815 734 266 81 21 5 5 3,174
Pennsylvania 4 699 1,253 539 236 109 29 12 7 2,884
Rhode Island - 1 22 7 11 9 7 7 5 69
South Carolina - 241 888 335 160 57 3 1 2 1,687
South Dakota 2 508 1,375 465 233 84 42 41 39 2,787
Tennessee - 1,164 851 141 36 11 2 3 4 2,212
Texas 18 1,113 4,571 1,795 623 87 15 19 2 8,225
Utah 14 198 756 360 198 93 45 23 8 1,681
Vermont - 150 299 77 34 19 8 10 4 601
Virginia - 126 1,365 336 110 30 16 3 1 1,987
Washington - 369 1,388 414 178 97 33 10 2 2,491
West Virginia - 92 677 313 190 81 19 13 16 1,401
Wisconsin - 775 1,068 600 310 109 37 30 8 2,937
Wyoming 5 336 1,455 695 207 37 36 1 6 2,773
U.S. Total 664 25,317 53,314 18,362 8,388 3,440 1,494 785 475 111,575
Puerto Rico - - 2 13 22 8 11 1 5 62
Grand Total 664 25,317 53,316 18,375 8,410 3,448 1,505 786 480 111,637

October 2009
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 15 185 110 21 12 16 4 1 1 350 37 314 317 47 18 8 2 - 3 709
Alaska - 18 33 10 6 1 - 1 - 69 - - 10 21 19 16 7 2 1 76
Arizona - 84 83 17 4 - - - - 188 18 150 126 53 74 36 18 7 6 470
Arkansas - 42 84 35 18 18 5 1 3 206 5 13 76 54 30 37 20 14 17 261
California 2 24 284 212 224 142 98 95 98 1,177 - 21 417 393 375 211 155 60 111 1,743
Colorado - 36 108 64 27 18 15 1 2 271 - 24 232 156 166 75 41 24 36 754
Connecticut - 31 151 64 33 11 5 5 2 302 - 12 112 141 94 46 22 13 20 460
Delaware 1 - 26 7 2 3 1 1 - 40 - 1 54 40 21 7 1 1 3 128
Dist. of Columbia - - - - 5 2 - 2 3 12 - - - 2 4 4 4 9 45 68
Florida 3 376 330 7 4 2 - - - 719 18 368 755 128 58 22 10 14 10 1,365
Georgia 12 336 131 43 5 - - - - 515 15 442 523 81 22 13 5 2 4 1,092
Hawaii - - 10 6 8 12 4 3 5 48 - 14 26 31 40 27 27 14 13 192
Idaho - 20 53 9 - - - 5 2 89 - 7 26 28 14 8 5 1 6 95
Illinois - 107 315 201 113 41 26 19 3 825 - 34 217 337 354 267 183 148 356 1,896
Indiana 3/ - 28 228 115 48 32 5 4 4 464 2 40 196 83 95 52 28 12 12 518
Iowa 1 15 65 32 16 11 7 4 2 152 30 16 103 82 53 39 27 22 33 375
Kansas 20 9 89 51 47 2 - - - 198 8 21 148 106 21 10 5 2 6 319
Kentucky - 47 81 36 29 15 1 - - 209 1 47 181 80 24 30 12 9 9 392
Louisiana 53 21 103 59 50 52 22 6 5 318 19 4 139 131 91 61 98 62 77 663
Maine - 10 37 14 6 - - - - 67 - 8 35 35 16 13 10 7 8 132
Maryland 10 60 144 39 15 9 9 3 8 287 12 63 198 87 40 37 17 14 61 517
Massachusetts 5 129 292 45 4 6 - - - 476 2 48 214 167 174 208 160 112 146 1,229
Michigan 1 73 271 149 59 38 17 18 9 634 - 104 316 273 178 138 134 102 133 1,378
Minnesota - 10 116 62 60 32 1 - 3 284 47 34 221 106 63 52 16 5 6 503
Mississippi - 23 104 40 21 13 5 1 1 208 - 26 157 104 62 48 23 16 18 454
Missouri - 108 269 44 26 7 2 3 1 460 9 109 364 170 97 33 14 12 8 807
Montana - 16 35 3 4 1 2 - - 61 - 4 23 14 12 7 4 2 1 67
Nebraska - 6 39 8 3 5 - - - 61 3 9 24 16 50 53 51 32 42 277
Nevada 1 58 33 16 8 8 1 1 - 125 - 61 49 20 14 6 2 1 2 155
New Hampshire - 33 38 2 - 1 1 - 1 76 6 43 78 17 7 9 2 2 3 161
New Jersey 5 33 102 90 47 25 34 16 14 361 16 16 216 294 272 214 119 89 154 1,374
New Mexico - 42 86 17 8 3 - - - 156 - 26 105 27 34 15 8 4 8 227
New York 37 72 398 132 71 60 36 26 31 826 92 31 430 464 327 195 117 68 266 1,898
North Carolina - 96 274 99 75 27 10 1 1 583 - 66 445 169 85 32 11 7 12 827
North Dakota - 9 37 5 1 - - - - 52 - 1 14 15 22 7 3 3 3 68
Ohio - 182 437 121 73 22 9 3 2 849 8 86 504 255 150 95 55 34 44 1,223
Oklahoma - 35 86 51 28 15 11 8 14 248 - 27 145 68 38 28 25 14 21 366
Oregon 2 4 97 50 15 5 1 1 - 173 1 16 154 78 63 32 26 10 23 402
Pennsylvania 13 154 316 131 50 21 7 2 1 682 34 158 534 453 333 212 104 61 54 1,909
Rhode Island - 9 25 14 1 - - - - 49 - - 35 43 27 18 12 8 14 157
South Carolina - 84 116 36 21 3 1 - 1 262 - 10 213 203 119 69 23 16 21 674
South Dakota - 9 29 25 6 2 5 - - 76 2 1 14 12 14 14 13 1 3 72
Tennessee 1 208 145 34 15 8 2 2 2 416 - 210 294 105 69 34 13 9 24 758
Texas 3 68 542 304 164 75 15 3 - 1,171 117 104 1,056 1,035 744 416 194 158 223 3,930
Utah - 64 78 27 26 13 4 - - 212 4 36 115 41 26 19 8 2 4 251
Vermont - 17 15 1 - - 7 - - 40 - - 15 9 5 5 6 4 8 52
Virginia 7 20 195 104 68 43 8 4 2 444 35 18 335 263 135 103 57 35 39 985
Washington - 56 142 44 29 18 5 2 1 297 - 28 244 124 71 50 27 27 53 624
West Virginia - 28 97 38 12 17 5 1 - 198 - 20 90 35 36 16 9 9 9 224
Wisconsin 1 40 100 66 30 9 14 3 3 265 5 38 196 236 156 125 79 79 80 989
Wyoming - 8 37 27 13 4 6 - 1 96 - 4 36 19 12 4 2 1 3 81
U.S. Total 193 3,143 7,016 2,827 1,610 868 411 246 226 16,347 546 2,933 10,527 6,951 5,024 3,276 2,014 1,360 2,262 34,347
Puerto Rico 1 - 30 53 57 53 22 9 9 233 2 - 2 18 12 32 21 13 14 112
Grand Total 194 3,143 7,046 2,880 1,667 921 433 255 235 16,580 548 2,933 10,529 6,969 5,036 3,308 2,035 1,373 2,276 34,459

October 2009
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 52 498 428 69 30 25 7 1 4 1,062
Alaska - 18 42 30 24 18 7 3 1 143
Arizona 18 234 209 70 78 36 18 7 6 658
Arkansas 5 55 161 89 48 55 25 15 19 467
California 2 45 701 605 599 353 253 155 209 2,920
Colorado - 60 340 219 193 93 55 25 38 1,023
Connecticut - 43 263 205 128 57 27 18 22 763
Delaware 1 1 80 47 23 10 2 1 3 167
Dist. of Columbia - - - 2 9 6 5 11 49 82
Florida 21 744 1,085 135 62 24 10 14 10 2,084
Georgia 27 778 654 125 27 13 5 2 4 1,608
Hawaii - 14 37 38 48 40 31 18 18 244
Idaho - 27 79 37 14 8 5 6 8 184
Illinois - 141 532 538 467 309 209 167 360 2,723
Indiana 3/ 2 69 424 198 143 84 33 16 17 984
Iowa 31 30 168 114 69 49 35 26 35 526
Kansas 28 30 236 157 67 12 6 2 7 517
Kentucky 1 94 262 116 53 44 14 9 9 601
Louisiana 72 25 242 190 140 113 120 67 82 979
Maine - 18 72 48 22 14 10 7 8 199
Maryland 22 123 342 126 56 46 26 17 69 805
Massachusetts 7 177 506 212 179 213 161 112 146 1,706
Michigan 1 177 586 422 237 176 151 120 142 2,011
Minnesota 47 43 337 168 123 84 17 5 9 786
Mississippi - 49 262 144 82 62 28 17 19 663
Missouri 9 217 633 213 123 39 15 15 9 1,264
Montana - 20 58 16 16 8 6 2 2 128
Nebraska 3 15 63 24 53 58 51 32 42 338
Nevada 1 119 82 36 22 14 2 2 2 279
New Hampshire 6 76 116 19 7 10 3 2 3 236
New Jersey 21 49 318 384 319 240 153 105 168 1,736
New Mexico - 68 192 43 41 18 8 4 8 382
New York 128 103 828 597 398 255 153 94 297 2,725
North Carolina - 162 719 268 159 59 22 7 13 1,409
North Dakota - 10 50 20 24 7 3 3 3 120
Ohio 8 268 941 376 223 117 64 36 46 2,071
Oklahoma - 63 231 120 66 43 37 22 35 617
Oregon 3 20 250 128 78 37 27 11 23 574
Pennsylvania 47 312 850 584 383 233 112 62 55 2,591
Rhode Island - 9 60 57 28 18 12 8 14 206
South Carolina - 94 328 239 140 72 24 16 22 935
South Dakota 2 10 43 38 20 17 18 2 3 151
Tennessee 1 418 438 140 85 42 15 10 26 1,174
Texas 119 173 1,599 1,339 908 492 209 161 224 5,105
Utah 4 100 192 68 52 32 12 2 4 462
Vermont - 17 31 10 5 5 12 4 8 92
Virginia 42 38 531 367 203 146 66 39 41 1,431
Washington - 84 386 167 100 68 32 29 54 920
West Virginia - 48 187 73 48 33 15 11 9 424
Wisconsin 6 77 296 302 186 133 93 83 83 1,253
Wyoming - 12 74 46 25 8 8 1 4 178
U.S. Total 737 6,075 17,544 9,778 6,633 4,148 2,432 1,604 2,492 50,706
Puerto Rico 3 - 32 72 69 86 43 22 23 347
Grand Total 740 6,075 17,576 9,850 6,702 4,234 2,475 1,626 2,515 51,053

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.

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Updated: 01/03/2012

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United States Department of Transportation - Federal Highway Administration