US Bridges

Slab bridges

A solid, flat concrete slab that acts as both the supporting structure and the roadway surface. Common for short crossings. The inventory lists 82,465 of them, 13.2% of all US bridges.

Bridges
82,465
Share of all bridges
13.2%
Poor condition
6.0%
4,962 bridges
Average age
47.7 yrs
Combined length
1,402 mi
Oldest
1825

Slab bridges by state

StateSlabShare of state's bridges
California5,96823.0%
Louisiana5,87746.3%
Iowa5,67923.9%
Kansas5,28921.2%
Wisconsin4,92133.9%
South Carolina4,25244.7%
Texas4,1597.3%
North Carolina3,93920.4%
Indiana3,62318.5%
Ohio3,49313.1%
Florida3,37825.8%
Oregon2,82834.0%
Missouri2,4219.8%
Virginia2,11515.0%
Oklahoma1,9948.7%
Illinois1,9317.2%
Arkansas1,85314.3%
Minnesota1,77013.1%
Nebraska1,54710.0%
Washington1,50017.6%
South Dakota1,26921.6%
Pennsylvania1,1935.1%
Arizona87210.2%
New Jersey79611.7%
New York7284.1%
Michigan6846.0%
Massachusetts62611.8%
Mississippi5663.4%
Georgia5373.6%
Maryland5319.7%
Vermont52118.2%
West Virginia4756.5%
Connecticut47310.8%
Wyoming44314.1%
Puerto Rico40716.7%
Montana3677.0%
Maine36514.4%
Alabama3632.2%
Colorado3624.0%
Kentucky3372.3%
New Mexico3378.4%
New Hampshire30011.8%
Tennessee2831.4%
Nevada21910.3%
Idaho2154.6%
Hawaii20917.7%
Utah1394.4%
North Dakota1062.5%
Alaska804.8%
Delaware728.2%
Rhode Island496.2%
District of Columbia20.8%
U.S. Virgin Islands28.3%

Materials used

Concrete Continuous40.9%
Concrete36.6%
Prestressed Concrete16.8%
Wood or Timber4.8%
Prestressed Concrete Continuous0.5%
Steel0.3%

When they were built

<1900: 62 bridges62<19001900s: 425 bridges42519001910s: 556 bridges55619101920s: 2,279 bridges2.3k19201930s: 5,010 bridges5.0k19301940s: 3,297 bridges3.3k19401950s: 7,720 bridges7.7k19501960s: 12,873 bridges13k19601970s: 10,490 bridges10k19701980s: 10,610 bridges11k19801990s: 10,297 bridges10k19902000s: 8,622 bridges8.6k20002010s: 7,478 bridges7.5k20102020s: 2,746 bridges2.7k2020
Slab bridges built per decade. Year built as recorded in the inventory; reconstruction years are not included.

Busiest

  1. Interstate 405 over Service Road
    Orange County, California · 300,000 vehicles/day
    Good
  2. Interstate 5 over Tustin Channel
    Orange County, California · 300,000 vehicles/day
    Good
  3. IH 41 NB over Sth 55
    Outagamie County, Wisconsin · 292,000 vehicles/day
    Fair
  4. Interstate 110 over Exposition Blvd
    Los Angeles County, California · 289,000 vehicles/day
    Good
  5. Route 5 over S5-ELMGROVE ST Off Ramp
    Los Angeles County, California · 288,660 vehicles/day
    Fair

Longest

  1. US158E over Currituck Sound
    Currituck County, North Carolina · 14,865 ft
    Fair
  2. NC12 over Pamlico Sound
    Dare County, North Carolina · 12,986 ft
    Good
  3. I-5 SB over Terrain
    King County, Washington · 6,584 ft
    Fair
  4. I-5 NB over Terrain
    King County, Washington · 5,762 ft
    Fair
  5. RTE 440 over Conrail State Street H
    Richmond County, New York · 4,894 ft
    Fair

Oldest

  1. Zion-Wertsville RD over Rock Brook
    Somerset County, New Jersey · Built 1825
    Fair
  2. Unger Road over Grove Creek
    Washington County, Maryland · Built 1830
    Fair
  3. Brackenville RD over Mill Creek
    New Castle County, Delaware · Built 1846
    Good
  4. Comb US 1 & Elm S over Water Ten Mile River
    Bristol County, Massachusetts · Built 1850
    Fair
  5. ST140 Summer ST over RR Macrr
    Bristol County, Massachusetts · Built 1850
    Good