National Bridge Inventory: Washington

  • Of the 8,278 bridges in the state, 382, or 4.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 353 bridges classified as structurally deficient in 2014.
  • 42 of the structurally deficient bridges are on the Interstate Highway System.
  • 562 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 6,080 bridges at an estimated cost of $9.2 billion.
  • This compares to 5,851 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
King 1965 73,221 Urban Interstate I-5 over King-Jackson St
King 1940 65,462 Urban Interstate Lacey V. Murrow Memorial Bridge
King 1989 65,462 Urban Interstate Homer M. Hadley Memorial Bridge
King 1966 56,452 Urban freeway/expressway SR 520 over 116th Ave Ne
Spokane 1963 40,568 Urban Interstate I-90 over Hangman Creek
King 1945 38,800 Urban other principal arterial S Boeing Access Rd over BNRR
King 1952 38,800 Urban other principal arterial S Boeing Access Rd over Airport Way Bar Ramp
Clark 1936 38,419 Rural Interstate I-5 over E Fork Lewis River
Clark 1940 38,419 Rural Interstate I-5 over Lewis River
King 1966 35,500 Urban other principal arterial S 212th St over Green River
Spokane 1963 34,707 Urban Interstate I-90 over Hangman Creek
King 1952 32,112 Urban freeway/expressway SR 99 over city streets & Railroad
King 1952 31,748 Urban freeway/expressway SR 99 over city streets & Railroad
King 1976 31,543 Rural Interstate I-90 over Game Crossing
Pierce 1934 28,799 Urban other principal arterial SR 167 over BNSF RR
Pierce 1959 27,805 Urban other principal arterial Gravelly Lake Dr over BNRR (Np)
King 1975 27,713 Rural Interstate I-90 over Raging River
Grays Harbor 1955 26,533 Urban other principal arterial US 101 over Chehalis River
King 1958 25,000 Urban minor arterial Meeker Road over Green River
King 1938 24,000 Urban other principal arterial 68th Ave NE over Sammamish River
King 1976 23,950 Rural Interstate I-90 over W Snoqualmie Ic
Skagit 1963 22,561 Rural Interstate I-5 over Samish River, Pvt Rd
Cowlitz 1969 22,511 Rural Interstate I-5 over Toutle River
Pierce 1936 21,774 Urban other principal arterial SR 302 over Henderson Bay
King 1929 20,700 Urban minor arterial W Garfield St over Marina Pl, RR, Ravine
Type of Bridge Number of Bridges Area of All Bridges
(sq. meters)
Daily Crossings on All Bridges Number of Structurally Deficient Bridges Area of Structurally Deficient Bridges
(sq. meters)
Daily Crossings on Structurally Deficient Bridges
Rural Interstate 282 345,251 4,815,261 29 46,547 483,628
Rural arterial 535 495,932 3,215,472 41 61,818 209,282
Rural minor arterial 331 239,328 1,314,679 24 23,028 75,514
Rural major collector 1,316 529,709 2,178,200 75 34,381 97,494
Rural minor collector 745 195,595 414,794 19 4,395 10,512
Rural local road 2,284 419,132 474,262 95 13,247 14,459
Urban Interstate 672 1,792,311 28,299,458 13 118,438 335,398
Urban freeway/expressway 512 1,395,280 14,084,709 13 86,797 266,723
Urban other principal arterial 505 905,182 9,524,883 29 111,431 443,482
Urban minor arterial 540 593,664 5,008,471 22 29,104 180,493
Urban collector 276 193,292 1,336,623 11 6,903 46,582
Urban local road 279 119,205 431,092 11 3,484 4,861
Total 8,278 7,223,882 71,097,904 382 539,572 2,168,428
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,764 $1,874 5,237,878 803,289
Widening & rehabilitation 151 $130 851,316 122,345
Rehabilitation 3,519 $7,061 60,871,455 5,371,712
Deck rehabilitation/replacement 189 $78 681,080 130,731
Other structural work 457 $99 750,606 179,947
Total 6,080 $9,241 68,392,335 6,608,024

About the data:

Data from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), released March 15, 2019. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

Effective January 1, 2018, FHWA changed the definition of structurally deficient as part of the final rule on highway and bridge performance measures, published May 20, 2017 pursuant to the 2012 federal aid highway bill Moving Ahead for Progress in the 21st Century Act (MAP-21). Two measures that were previously used to classify bridges as structurally deficient are no longer used. This includes bridges where the overall structural evaluation was rated in poor or worse condition, or where the adequacy of waterway openings was insufficient.

The new definition limits the classification to bridges where one of the key structural elements—the deck, superstructure, substructure or culverts, are rated in poor or worse condition. During inspection, the conditions of a variety of bridge elements are rated on a scale of 0 (failed condition) to 9 (excellent condition). A rating of 4 is considered “poor” condition.

Cost estimates have been derived by ARTBA, based on 2017 average bridge replacement costs for structures on and off the National Highway System, published by FHWA. Bridge rehabilitation costs are estimated to be 68 percent of replacement costs. A bridge is considered to need repair if the structure has identified repairs as part of the NBI, a cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient.

Bridges are classified by FHWA into types based on the functional classification of the roadway on the bridge. Interstates comprise routes officially designated by the Secretary of Transportation. Other principal arterials serve major centers of urban areas or provide mobility through rural areas. Freeways and expressways have directional lanes generally separated by a physical barrier, and access/egress points generally limited to on- and off-ramps. Minor arterials serve smaller areas and are used for trips of moderate length. Collectors funnel traffic from local roads to the arterial network; major collectors have higher speed limits and traffic volumes and are longer in length and spaced at greater intervals, while minor collectors are shorter and provide service to smaller communities. Local roads do not carry through traffic and are intended for short distance travel.

from 42 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
39. Virginia 4.6%
40. Washington 4.6%
41. Arkansas 4.6%

from 34 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
33. Montana 390
34. Washington 382
35. Florida 328
Full State Ranking

  • Source: Bridge data is from the 2018 National Bridge Inventory ASCII files, released by the Federal Highway Administration on March 14, 2019. Note that specific conditions on bridges may have changed as a result of recent work. ARTBA is a non-partisan federation whose primary goal is to aggressively grow and protect transportation infrastructure investment to meet the public and business demand for safe and efficient travel.
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