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Idaho county road miles

28,012 miles

Miles of road Idaho counties maintain, all surface types, 2018

+0.1% since 2017 (27,977 miles); +0.7% since 2013 (27,830 miles); +0.1% since 2010 (27,982 miles)

Source: Idaho Transportation Department, Road Miles by County by Surface Type. Data period 2018. Published .

Total miles of road maintained by the county, all surface types.

Change and comparison

The latest figure, 2018, is the highest in the series, which begins in 2010.

Among 44 Idaho counties in 2018, Twin Falls County was highest at 1,268 miles and Boise County lowest at 284.849 miles.

The largest category in county road miles by surface type is Graded & Drained Gravel at 12,534 miles; next is Low Bitumen at 7,832 miles.

Historical data

Idaho county road miles, 2010 to 2018Idaho county road miles, 2010 to 2018. Idaho: 27,981.663 in 2010, 28,011.751 in 2018.010k20k30k20102015IdahoMilesIdaho county road miles, 2010 to 2018Idaho county road miles, 2010 to 2018. Idaho: 27,981.663 in 2010, 28,011.751 in 2018.010k20k30k20102015IdahoMilesIdaho county road miles, 2010 to 2018Idaho county road miles, 2010 to 2018. Idaho: 27,981.663 in 2010, 28,011.751 in 2018.010k20k30k20102012201420162018IdahoMiles

Source: Idaho Transportation Department, Road Miles by County by Surface Type. Published .

Data table (9 rows)
PeriodIdaho (miles)
201027,981.663
201127,943.129
201227,893.538
201327,829.677
201427,860.799
201527,897.641
201627,939.693
201727,976.787
201828,011.751

By county

Miles

  1. Twin Falls1,268.295
  2. Idaho County1,263.247
  3. Cassia1,237.936
  4. Bingham1,214.591
  5. Canyon1,110.584
  6. Bonneville1,067.204
  7. Owyhee1,012.240
  8. Elmore976.551
  9. Kootenai906.849
  10. Latah816.844
  11. Valley762.361
  12. Caribou751.718
  13. Jefferson745.888
  14. Power720.467
  15. Fremont709.424
  16. Bonner697.771
  17. Custer637.475
  18. Bannock629.976
  19. Nez Perce625.035
  20. Minidoka624.532
  21. Ada612.572
  22. Jerome566.419
  23. Oneida562.145
  24. Washington554.496
  25. Gooding489.991
  26. Lewis489.389
  27. Madison478.967
  28. Bear Lake453.962
  29. Lincoln440.278
  30. Blaine432.991
  31. Benewah429.936
  32. Camas420.381
  33. Lemhi413.743
  34. Franklin409.344
  35. Butte407.638
  36. Clark387.046
  37. Shoshone377.819
  38. Adams375.722
  39. Teton342.381
  40. Gem341.595
  41. Clearwater335.441
  42. Boundary334.086
  43. Payette291.570
  44. Boise284.849

Source: Idaho Transportation Department, Road Miles by County by Surface Type. Data period 2018. Published .

Ada County: 612.572 Miles (2018)Adams County: 375.722 Miles (2018)Bannock County: 629.976 Miles (2018)Bear Lake County: 453.962 Miles (2018)Benewah County: 429.936 Miles (2018)Bingham County: 1,214.591 Miles (2018)Blaine County: 432.991 Miles (2018)Boise County: 284.849 Miles (2018)Bonner County: 697.771 Miles (2018)Bonneville County: 1,067.204 Miles (2018)Boundary County: 334.086 Miles (2018)Butte County: 407.638 Miles (2018)Camas County: 420.381 Miles (2018)Canyon County: 1,110.584 Miles (2018)Caribou County: 751.718 Miles (2018)Cassia County: 1,237.936 Miles (2018)Clark County: 387.046 Miles (2018)Clearwater County: 335.441 Miles (2018)Custer County: 637.475 Miles (2018)Elmore County: 976.551 Miles (2018)Franklin County: 409.344 Miles (2018)Fremont County: 709.424 Miles (2018)Gem County: 341.595 Miles (2018)Gooding County: 489.991 Miles (2018)Idaho County: 1,263.247 Miles (2018)Jefferson County: 745.888 Miles (2018)Jerome County: 566.419 Miles (2018)Kootenai County: 906.849 Miles (2018)Latah County: 816.844 Miles (2018)Lemhi County: 413.743 Miles (2018)Lewis County: 489.389 Miles (2018)Lincoln County: 440.278 Miles (2018)Madison County: 478.967 Miles (2018)Minidoka County: 624.532 Miles (2018)Nez Perce County: 625.035 Miles (2018)Oneida County: 562.145 Miles (2018)Owyhee County: 1,012.24 Miles (2018)Payette County: 291.57 Miles (2018)Power County: 720.467 Miles (2018)Shoshone County: 377.819 Miles (2018)Teton County: 342.381 Miles (2018)Twin Falls County: 1,268.295 Miles (2018)Valley County: 762.361 Miles (2018)Washington County: 554.496 Miles (2018)
  • 284.849 to 399.4
  • 399.401 to 481.05
  • 481.051 to 628.987
  • 628.988 to 852.845
  • 852.846 to 1,268.295

Source: Idaho Transportation Department, Road Miles by County by Surface Type. Data period 2018. Published .

Data table (44 rows)
County2018
Twin Falls County1,268.295
Idaho County1,263.247
Cassia County1,237.936
Bingham County1,214.591
Canyon County1,110.584
Bonneville County1,067.204
Owyhee County1,012.240
Elmore County976.551
Kootenai County906.849
Latah County816.844
Valley County762.361
Caribou County751.718
Jefferson County745.888
Power County720.467
Fremont County709.424
Bonner County697.771
Custer County637.475
Bannock County629.976
Nez Perce County625.035
Minidoka County624.532
Ada County612.572
Jerome County566.419
Oneida County562.145
Washington County554.496
Gooding County489.991
Lewis County489.389
Madison County478.967
Bear Lake County453.962
Lincoln County440.278
Blaine County432.991
Benewah County429.936
Camas County420.381
Lemhi County413.743
Franklin County409.344
Butte County407.638
Clark County387.046
Shoshone County377.819
Adams County375.722
Teton County342.381
Gem County341.595
Clearwater County335.441
Boundary County334.086
Payette County291.570
Boise County284.849

County road miles by surface type

County-maintained road miles broken down by surface type.

Miles

  1. Graded & Drained Gravel12,533.891
  2. Low Bitumen7,832.276
  3. High Bitumen4,417.957
  4. Less Than One Inch Bitumen1,424.044
  5. Unimproved978.132
  6. Graded & Drained Earth822.928
  7. Portland Cement2.524

Source: Idaho Transportation Department, Road Miles by County by Surface Type. Data period 2018. Published .

Data table (7 rows)
Surface type2018 (miles)
Graded & Drained Gravel12,533.891
Low Bitumen7,832.276
High Bitumen4,417.957
Less Than One Inch Bitumen1,424.044
Unimproved978.132
Graded & Drained Earth822.928
Portland Cement2.524

Source

Organization
Idaho Transportation Department
Dataset
Road Miles by County by Surface Type
Geography
Counties and Idaho
Time coverage
2010-2018
Update frequency
Annual, but not published since the 2018 edition as of this check.
Published
Original file
https://apps.itd.idaho.gov/apps/Fund/Local/SURTYPE18.pdf
Methodology
https://itd.idaho.gov/local-highway-dist-fund/
License
Idaho public record.
Our copy
Road Miles by County by Surface Type

Caveats

  • This is road mileage maintained by the county itself, not every public road within the county: state highways, city streets and roads under a separate highway district (such as the Ada County Highway District) are not counted here. It is the mileage the Idaho Transportation Department's Local Highway Distribution Fund uses to divide funding among counties and highway districts.
  • No edition has been published since the one covering 2018.

Cite

Cite this page as Understand Idaho, “Idaho county road miles”, https://understandidaho.com/transportation/county-road-miles/, retrieved on the date you read it, and the publisher named above for the figures themselves. The dataset behind it is described in the data catalog.

This page was last updated .