Skip to contentUnited States Department of Transportation - Federal Highway AdministrationSearch FHWAFeedback
Policy Information

Highway Statistics 2007

Functional System Length - 2007 Miles by Measured Pavement Roughness - Rural

OCTOBER 2008
Table HM-64
SHEET 1 OF 4

Excel Version (80 kb)
PDF Version (38 kb)

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
INTERSTATE
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
Alaska - 25 234 429 204 59 53 8 - 1,012
Arizona - 580 347 38 11 2 3 - - 981
Arkansas 1 175 188 55 16 8 11 4 3 460
California - 93 533 193 169 84 68 75 66 1,281
Colorado - 80 303 155 90 40 17 - - 685
Connecticut - - 31 10 1 1 - - - 43
Delaware - - - - - - - - - -
Dist. of Columbia - - - - - - - - - -
Florida 2 479 267 - - - - - - 746
Georgia 144 307 237 24 3 - - - - 571
Hawaii - - - - 6 - - - - 6
Idaho - 15 372 87 34 10 - 3 - 521
Illinois - 391 678 198 78 12 - - - 1,357
Indiana 4/ - 69 436 166 30 6 - - - 707
Iowa - 102 280 154 62 20 5 3 2 628
Kansas 10 302 276 65 3 - - - - 646
Kentucky 2 203 275 25 36 12 - - - 551
Louisiana 59 163 140 76 60 1 13 16 6 475
Maine - 82 161 37 19 - - - - 299
Maryland 1 65 109 7 1 - - - - 182
Massachusetts - 14 38 23 - 16 - - - 91
Michigan - 175 265 52 59 43 - 13 1 608
Minnesota 5/ - 83 299 113 105 47 9 5 - 661
Mississippi - 81 317 43 33 14 4 - 1 493
Missouri - 315 380 19 4 3 - - - 721
Montana - 455 584 27 40 20 4 - - 1,130
Nebraska - 240 132 31 11 6 - - - 420
Nevada - 387 24 23 13 4 - - - 451
New Hampshire - 66 69 12 1 - - - 1 149
New Jersey - 7 23 14 12 5 1 3 - 65
New Mexico - 499 285 55 4 3 - - - 846
New York 2 128 447 120 31 42 37 20 7 832
North Carolina - 78 308 63 47 28 16 1 - 541
North Dakota - 189 250 59 15 6 - - - 519
Ohio - 260 371 65 17 7 1 2 1 724
Oklahoma - 188 351 94 22 21 7 - - 683
Oregon - 41 457 55 1 - - - - 554
Pennsylvania 1 387 459 150 56 13 3 1 1 1,070
Rhode Island - 1 21 - - - - - - 22
South Carolina - 218 225 76 33 27 1 - - 580
South Dakota - 78 330 155 34 5 - - - 602
Tennessee - 574 96 9 2 6 - 1 1 689
Texas 89 428 1,262 265 95 32 8 1 - 2,091
Utah - 172 378 112 26 28 - 6 1 723
Vermont - 127 121 17 5 1 4 4 - 279
Virginia - 90 521 37 16 2 - - - 666
Washington - 132 178 44 55 47 11 - - 467
West Virginia - 23 254 48 27 18 - 1 5 376
Wisconsin - 86 210 113 42 12 6 9 - 478
Wyoming - 188 455 139 16 6 - 10 1 815
U.S. Total 311 9,269 14,065 3,752 1,656 718 293 186 101 30,040
Puerto Rico 1 - - 8 4 8 4 6 - 30
Grand Total 312 9,269 14,065 3,760 1,660 726 297 192 101 30,070

OCTOBER 2008
Table HM-64
SHEET 2 OF 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
OTHER PRINCIPAL ARTERIAL MINOR ARTERIAL 3/
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 5 813 1,165 130 24 9 4 1 1 2,147 27 924 2,070 354 302 140 - - - 3,790
Alaska 155 50 187 84 83 43 25 72 107 651 154 9 28 16 65 77 95 - - 290
Arizona 2 528 376 135 65 40 14 2 5 1,165 27 499 499 184 104 44 - - - 1,330
Arkansas 3 167 956 683 264 108 30 13 10 2,231 - 2 909 1,082 545 251 157 - 7 2,953
California 9 151 1,708 813 475 165 103 51 38 3,504 76 71 1,229 2,050 1,595 772 414 142 264 6,537
Colorado 1 228 1,125 439 332 89 48 35 21 2,317 174 123 1,251 1,067 614 383 143 3 - 3,584
Connecticut - 6 45 53 42 15 1 1 1 164 - - 26 70 90 52 10 - - 248
Delaware - 2 99 61 1 2 - - - 165 - - 67 31 3 2 - - - 103
Dist. of Columbia - - - - - - - - - - - - - - - - - - - -
Florida 9 997 1,567 201 37 20 15 8 - 2,845 - 737 1,450 105 90 18 - - - 2,400
Georgia 17 1,631 929 42 2 1 - - - 2,605 7 2,756 2,408 40 - - - - - 5,204
Hawaii - - 15 22 31 30 3 6 3 110 - - 6 91 39 118 11 3 29 297
Idaho 12 60 1,030 387 159 53 17 2 2 1,710 19 56 853 239 158 35 16 - - 1,357
Illinois - 112 909 591 349 213 103 36 24 2,337 - 230 2,009 1,046 259 442 208 515 - 4,709
Indiana 4/ - 457 836 247 114 57 10 12 1 1,734 - 618 853 476 151 79 35 9 - 2,221
Iowa 28 421 1,119 743 490 322 202 86 55 3,438 - 630 1,135 635 449 572 199 115 176 3,911
Kansas 32 620 1,967 372 46 19 3 3 2 3,032 - 764 3,168 286 29 9 9 13 6 4,284
Kentucky - 631 1,188 343 152 21 5 1 1 2,342 - 33 691 810 134 46 4 - 8 1,726
Louisiana 12 79 386 213 123 92 39 26 22 980 - 80 829 248 70 200 52 40 70 1,589
Maine - 85 349 147 84 56 34 15 17 787 - 61 486 172 134 72 49 7 33 1,014
Maryland 9 146 216 50 14 7 1 - 1 435 - 48 573 163 26 9 3 19 - 841
Massachusetts - 4 41 76 34 8 4 - - 167 - 11 106 136 126 5 17 4 - 405
Michigan - 941 1,108 323 136 47 22 5 3 2,585 - 1,144 1,961 832 504 100 84 8 324 4,957
Minnesota 5/ - 785 1,465 667 388 281 78 25 7 3,696 - 1,393 1,938 1,766 939 447 253 100 74 6,910
Mississippi - 274 1,060 193 211 70 33 35 9 1,885 - 92 1,137 912 486 294 529 103 142 3,695
Missouri - 456 1,300 600 416 212 90 36 10 3,120 - 76 779 2,007 721 110 137 121 10 3,961
Montana - 625 1,469 374 109 37 2 5 1 2,622 1 305 1,926 497 176 76 - - - 2,980
Nebraska - 568 1,144 444 310 101 90 21 15 2,693 - 906 1,931 612 273 316 49 77 5 4,169
Nevada 1 1,124 269 11 1 1 1 - 2 1,409 2 355 280 22 76 - - 2 - 735
New Hampshire - 85 190 39 25 12 2 2 7 362 - 83 241 40 36 25 1 13 30 469
New Jersey - 4 65 45 91 31 12 4 2 254 - 14 37 102 69 56 14 8 13 313
New Mexico 11 955 523 216 105 23 5 2 2 1,831 10 446 668 438 188 40 25 71 51 1,927
New York 6 113 784 372 136 70 23 16 23 1,537 - 51 2,044 677 709 202 - 22 36 3,741
North Carolina - 194 1,184 337 143 68 16 11 10 1,963 - 35 1,238 910 323 70 27 - 4 2,607
North Dakota - 695 1,187 513 256 175 81 1 24 2,932 - 307 916 508 452 264 69 - - 2,516
Ohio - 290 1,060 326 192 80 13 3 4 1,968 - 113 1,627 331 242 121 174 45 4 2,657
Oklahoma 1 249 834 617 280 125 82 71 59 2,317 - 132 1,216 699 277 174 66 97 25 2,686
Oregon 1 317 1,471 599 278 82 21 4 11 2,783 - 285 1,012 600 284 120 12 48 - 2,361
Pennsylvania 37 147 861 528 229 112 30 9 9 1,925 - 106 1,481 1,178 671 687 187 127 103 4,540
Rhode Island - - 2 7 11 9 7 8 5 49 - - 3 11 23 14 10 2 3 66
South Carolina - 68 821 231 115 40 3 2 2 1,282 - 4 1,888 695 565 103 8 16 9 3,288
South Dakota - 393 1,253 429 216 73 65 70 35 2,534 - 429 946 391 354 434 504 229 49 3,336
Tennessee - 823 859 137 31 10 3 2 6 1,871 - 998 1,418 405 298 13 8 - 60 3,200
Texas 20 685 3,462 1,950 610 186 61 42 5 7,001 - 432 3,836 4,026 1,124 358 159 5 62 10,002
Utah - 38 384 249 180 70 42 17 6 986 - 96 420 357 230 338 45 - 5 1,491
Vermont - 12 190 41 25 35 9 3 5 320 - 4 190 138 134 122 76 44 20 728
Virginia - 38 931 336 76 18 6 2 1 1,408 - 59 1,376 1,670 272 25 10 - - 3,412
Washington - 279 1,200 291 114 30 51 2 13 1,980 - 210 664 357 453 178 - - 3 1,865
West Virginia - 37 465 272 166 70 20 12 9 1,051 - - 522 246 407 135 7 - 23 1,340
Wisconsin 1 871 1,143 626 325 140 44 25 9 3,183 - 1,732 1,577 644 469 286 88 27 9 4,832
Wyoming 5 150 960 631 176 54 1 10 1 1,983 - 117 424 359 157 89 71 4 - 1,221
U.S. Total 377 18,404 43,857 17,236 8,272 3,632 1,574 815 606 94,396 497 17,576 54,342 30,731 15,895 8,523 4,035 2,039 1,657 134,798
Puerto Rico 3 - 1 4 25 4 7 3 6 50 36 - - 1 6 18 32 40 99 196
Grand Total 380 18,404 43,858 17,240 8,297 3,636 1,581 818 612 94,446 533 17,576 54,342 30,732 15,901 8,541 4,067 2,079 1,756 134,994

OCTOBER 2008
Table HM-64
SHEET 3 OF 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
INTERSTATE
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
Alaska - 12 33 13 6 3 - 1 - 68
Arizona - 70 76 28 13 1 - - - 188
Arkansas - 24 93 32 17 16 8 2 4 196
California 2 24 284 212 224 142 98 95 98 1,177
Colorado - 15 110 73 37 19 11 3 - 268
Connecticut - 27 145 69 36 11 7 4 3 302
Delaware 1 - 25 8 2 3 1 1 - 40
Dist. of Columbia - - - - 5 2 - 2 3 12
Florida 3 342 352 17 6 1 1 - - 719
Georgia 83 313 103 23 4 2 - - - 445
Hawaii - - 10 6 8 12 4 3 5 48
Idaho 1 4 51 21 1 - 4 2 7 90
Illinois - 121 264 211 114 64 27 8 4 813
Indiana 4/ - 28 228 115 49 32 5 4 4 465
Iowa 1 12 62 33 18 13 7 5 2 152
Kansas 20 30 84 59 22 2 1 - - 198
Kentucky - 62 65 49 23 9 - 1 - 209
Louisiana 53 52 82 53 53 54 11 7 5 317
Maine - 9 38 13 6 - 1 - - 67
Maryland 10 59 144 35 17 10 9 6 9 289
Massachusetts 5 92 234 92 24 33 1 1 - 477
Michigan 1 66 255 140 74 52 19 18 10 634
Minnesota 5/ - 15 111 56 45 21 2 - 3 253
Mississippi - 24 90 36 23 16 5 3 10 207
Missouri - 129 249 43 20 7 4 4 3 459
Montana - 16 35 3 4 1 2 - - 61
Nebraska - 5 34 7 5 7 3 1 1 63
Nevada - 53 28 19 9 9 1 - - 119
New Hampshire - 34 32 4 - - - - 7 77
New Jersey 5 33 102 90 47 25 34 16 14 361
New Mexico - 42 86 17 8 3 - - - 156
New York 34 71 371 145 81 62 37 24 27 818
North Carolina - 75 271 129 55 21 11 4 1 567
North Dakota - 10 33 8 1 - - - - 52
Ohio - 154 435 145 77 23 10 3 2 849
Oklahoma 1 48 109 29 22 14 7 7 13 249
Oregon 2 25 114 22 10 1 - - - 172
Pennsylvania 13 123 323 143 52 18 10 3 1 673
Rhode Island - 9 25 14 1 - - - - 49
South Carolina - 78 125 37 15 5 1 1 - 262
South Dakota - 8 23 25 13 3 4 - - 76
Tennessee - 213 151 28 14 6 3 1 1 417
Texas 8 47 424 258 179 85 41 9 3 1,046
Utah - 57 84 29 26 12 4 - - 212
Vermont - 6 15 10 1 2 7 - - 41
Virginia 7 22 195 102 70 43 8 3 2 445
Washington - 81 125 40 12 27 7 2 2 296
West Virginia - 23 93 32 12 11 5 1 - 177
Wisconsin 3 28 95 80 32 13 13 1 - 262
Wyoming - 15 31 26 9 11 2 - 3 97
U.S. Total 271 3,010 6,622 2,898 1,613 948 444 251 249 16,035
Puerto Rico 1 - 10 47 53 63 24 24 10 231
Grand Total 272 3,010 6,632 2,945 1,666 1,011 468 275 259 16,266

OCTOBER 2008
Table HM-64
SHEET 4 OF 4

STATE INTERNATIONAL ROUGHNESS INDEX (IRI) 1/
OTHER FREEWAYS AND EXPRESSWAYS OTHER PRINCIPAL ARTERIAL
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 14 20 4 - - - 1 - 39 71 290 467 129 52 29 11 2 6 986
Alaska - - - - - - - - - - - - 13 17 13 6 8 2 3 62
Arizona 1 114 40 4 7 4 1 - - 170 413 61 161 172 223 159 104 56 52 988
Arkansas 1 9 32 16 8 14 9 6 6 100 7 9 123 153 128 77 54 35 33 612
California 7 21 380 338 386 195 136 38 49 1,543 118 30 276 576 927 1,192 1,031 907 1,357 6,296
Colorado - 18 151 70 50 17 7 1 1 315 3 20 186 204 281 187 125 81 102 1,186
Connecticut - 13 93 76 29 16 4 3 2 236 - - 30 138 167 130 80 60 80 685
Delaware - 1 21 6 2 1 - - - 31 1 - 47 56 31 14 6 6 18 178
Dist. of Columbia - - - 3 4 5 - 5 3 20 - - - - - 2 10 10 79 101
Florida 2 116 423 17 8 6 3 - - 573 24 523 1,809 699 310 132 44 23 32 3,572
Georgia 1 68 32 7 3 2 - - - 112 93 707 863 187 56 36 9 2 2 1,862
Hawaii - - 6 4 9 5 3 3 4 34 - 14 32 32 44 31 35 15 25 228
Idaho - - - - - - - - - - 74 13 87 63 44 37 15 16 18 293
Illinois - 7 10 26 19 30 6 14 3 115 - 51 441 651 597 485 283 224 325 3,057
Indiana 4/ - 11 45 28 31 8 5 5 2 135 4 94 334 266 268 209 141 100 126 1,538
Iowa - - - - - - - - - - 67 38 180 144 102 84 56 48 87 739
Kansas 6 9 116 33 16 4 1 - 1 180 88 17 211 75 68 99 96 82 50 698
Kentucky - 14 40 2 10 - - - - 66 - 44 259 211 127 68 30 22 23 784
Louisiana 5 - 18 6 10 - 8 - 2 44 46 29 178 190 120 112 118 94 172 1,013
Maine - 4 6 4 3 1 1 - 1 20 - 6 32 35 16 14 12 11 15 141
Maryland 8 40 131 66 20 14 5 3 6 285 12 51 226 161 138 109 80 64 238 1,067
Massachusetts 3 52 154 56 27 9 6 5 - 309 - 21 80 251 341 399 281 231 242 1,846
Michigan - 63 132 67 30 29 6 2 2 331 - 67 329 317 362 335 261 249 382 2,302
Minnesota 5/ - 11 76 42 17 8 4 2 - 160 - 45 172 145 112 62 28 12 17 593
Mississippi - 13 32 8 6 3 6 - 1 69 - 34 239 179 189 127 90 67 60 985
Missouri 5 70 196 69 35 11 9 3 3 396 257 60 277 204 165 86 40 36 50 918
Montana - - - - - - - - - - 5 4 32 36 32 26 13 13 27 183
Nebraska - 5 1 2 5 7 1 1 - 22 3 10 46 39 82 83 63 56 89 468
Nevada - 21 19 13 15 4 - - - 72 10 85 104 40 26 9 7 3 10 284
New Hampshire - 29 23 1 1 - - 2 - 56 - 22 93 39 25 16 11 7 9 222
New Jersey 1 16 158 114 60 20 20 7 7 402 97 1 79 208 281 288 191 175 384 1,607
New Mexico - - 5 - - - - - - 5 41 46 186 129 119 70 47 35 34 666
New York 15 20 186 198 160 79 73 22 45 783 62 35 440 469 385 265 181 132 878 2,785
North Carolina - 28 225 77 42 19 5 1 1 398 - 50 726 411 259 139 60 44 87 1,776
North Dakota - - - - - - - - - - - 5 22 45 34 24 16 10 11 167
Ohio - 39 238 99 67 23 11 3 4 484 - 214 624 482 394 243 164 117 179 2,417
Oklahoma - 7 100 21 22 14 5 8 14 191 6 30 150 194 152 138 100 92 183 1,039
Oregon - 5 38 11 1 3 - - - 58 1 38 206 152 126 96 53 37 48 756
Pennsylvania 12 61 204 138 65 45 15 5 5 538 18 80 500 648 608 440 256 152 141 2,825
Rhode Island - - 35 35 10 5 - 1 - 86 - - 5 25 72 80 56 50 72 360
South Carolina - 6 51 11 6 9 - - 1 84 - 20 325 304 186 104 46 32 40 1,057
South Dakota - - 4 5 1 2 - - - 12 22 1 11 18 19 23 20 15 13 120
Tennessee - 61 44 21 12 4 2 1 1 146 - 301 628 248 153 86 40 32 57 1,545
Texas 5 39 445 336 231 117 50 15 7 1,240 96 101 877 1,097 916 642 474 400 610 5,117
Utah - - 6 5 1 - - - - 12 31 43 140 69 44 24 13 3 4 340
Vermont - 2 6 5 2 1 5 - - 21 - - 31 14 17 17 8 7 9 103
Virginia 3 16 123 87 16 11 10 2 2 267 33 7 326 326 197 163 82 73 77 1,251
Washington 1 55 222 55 19 8 4 7 4 374 - 18 212 220 207 182 109 104 255 1,307
West Virginia - - 2 1 2 2 1 1 - 9 - 37 119 55 50 26 17 13 15 332
Wisconsin - 7 99 88 50 32 4 6 - 286 314 77 270 286 275 237 171 134 153 1,603
Wyoming - - - 3 - - - - - 3 13 4 62 43 33 18 14 6 19 199
U.S. Total 78 1,085 4,388 2,278 1,518 787 426 173 177 10,832 2,030 3,453 13,266 10,852 9,573 7,660 5,260 4,197 6,998 61,259
Puerto Rico 2 - 3 13 7 18 10 4 9 64 31 - 2 26 59 67 84 65 57 360
Grand Total 80 1,085 4,391 2,291 1,525 805 436 177 186 10,896 2,061 3,453 13,268 10,878 9,632 7,727 5,344 4,262 7,055 61,619

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/Estimated from sample data.

4/Excludes 788 miles of Federal agency owned roads.

5/Excludes 437 miles of local government owned roads.

Excel files can be viewed with the Excel Viewer
PDF files can be viewed with the Acrobat® Reader®
Updated: 01/03/2012

FHWA
United States Department of Transportation - Federal Highway Administration