Culvert bridges
A pipe or box structure carrying water beneath the roadway. Culverts over 20 feet long are counted as bridges. The inventory lists 148,527 of them, 23.8% of all US bridges.
- Bridges
- 148,527
- Share of all bridges
- 23.8%
- Poor condition
- 2.4%
- 3,498 bridges
- Average age
- 47.9 yrs
- Combined length
- 975 mi
- Oldest
- 1800
Culvert bridges by state
| State | Culvert | Share of state's bridges |
|---|---|---|
| Texas | 21,397 | 37.6% |
| Tennessee | 9,162 | 45.0% |
| Kansas | 8,562 | 34.4% |
| Oklahoma | 7,646 | 33.4% |
| Alabama | 6,443 | 39.8% |
| Minnesota | 6,184 | 45.6% |
| Georgia | 5,675 | 37.6% |
| Missouri | 5,435 | 22.1% |
| North Carolina | 5,390 | 27.9% |
| Illinois | 4,981 | 18.5% |
| Iowa | 4,936 | 20.8% |
| Arizona | 4,797 | 55.9% |
| Nebraska | 4,495 | 29.2% |
| Mississippi | 4,013 | 24.0% |
| Arkansas | 3,604 | 27.8% |
| California | 3,571 | 13.7% |
| Virginia | 3,255 | 23.0% |
| Pennsylvania | 3,127 | 13.4% |
| Kentucky | 3,056 | 20.9% |
| Florida | 2,640 | 20.2% |
| Louisiana | 2,583 | 20.4% |
| Indiana | 2,399 | 12.3% |
| Wisconsin | 2,170 | 15.0% |
| New York | 2,117 | 12.0% |
| Michigan | 2,039 | 17.9% |
| Colorado | 1,955 | 21.7% |
| New Mexico | 1,844 | 45.7% |
| Ohio | 1,841 | 6.9% |
| South Dakota | 1,683 | 28.6% |
| Maryland | 1,332 | 24.2% |
| North Dakota | 1,293 | 30.4% |
| South Carolina | 1,120 | 11.8% |
| Nevada | 907 | 42.7% |
| Utah | 721 | 22.9% |
| Connecticut | 675 | 15.5% |
| New Jersey | 623 | 9.1% |
| Washington | 617 | 7.2% |
| West Virginia | 551 | 7.5% |
| Wyoming | 511 | 16.3% |
| Oregon | 468 | 5.6% |
| Maine | 413 | 16.2% |
| Montana | 363 | 6.9% |
| Puerto Rico | 347 | 14.3% |
| Massachusetts | 340 | 6.4% |
| New Hampshire | 288 | 11.3% |
| Vermont | 220 | 7.7% |
| Delaware | 201 | 23.0% |
| Hawaii | 200 | 16.9% |
| Idaho | 156 | 3.4% |
| Alaska | 119 | 7.2% |
| Rhode Island | 44 | 5.6% |
| U.S. Virgin Islands | 11 | 45.8% |
| District of Columbia | 7 | 2.7% |
Materials used
| Concrete | 67.1% |
| Concrete Continuous | 20.7% |
| Steel | 10.2% |
| Aluminum, Wrought Iron, or Cast Iron | 1.4% |
| Masonry | 0.3% |
| Other | 0.1% |
When they were built
Busiest
- IH 35 over Pecan CreekFairHill County, Texas · 810,110 vehicles/day
- IH 10 over DrainGoodHarris County, Texas · 405,615 vehicles/day
- IH 10 over Rummel CreekGoodHarris County, Texas · 387,238 vehicles/day
- IH 10 over Rummel Creek & TribGoodHarris County, Texas · 387,238 vehicles/day
- Interstate 405 over Bolsa Chica DitchFairOrange County, California · 374,000 vehicles/day
Longest
- E1530 over CreekGoodPittsburg County, Oklahoma · 20,000 ft
- I-44 N. Frtg. Rd. over Perryman DitchFairTulsa County, Oklahoma · 6,336 ft
- US 6 (159th) over Along US 6 EB LanesFairCook County, Illinois · 4,575 ft
- Orange Avenue over Master Drainage DitchFairLeon County, Florida · 4,298 ft
- WB NW 25th St. over North Line CanalPoorMiami-Dade County, Florida · 3,550 ft
Oldest
- Alexander ST over Genetta DitchGoodMontgomery County, Alabama · Built 1800
- Auburn ST over Genetta DitchFairMontgomery County, Alabama · Built 1800
- Flood ST over Genetta DitchFairMontgomery County, Alabama · Built 1800
- Kahn ST over Genetta DitchGoodMontgomery County, Alabama · Built 1800
- Rosa Parks Ave over Genetta DitchGoodMontgomery County, Alabama · Built 1800