National Bridge Inventory: Washington

  • Of the 8,338 bridges in the state, 416, or 5.0 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 364 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 6.6 percent of total deck area on all structures.
  • 46 of the structurally deficient bridges are on the Interstate Highway System. A total of 67.8 percent of the structurally deficient bridges are not on the National Highway System, which includes the Interstate and other key roads linking major airports, ports, rail and truck terminals.
  • 707 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 6,806 bridges at an estimated cost of $14.9 billion.
  • This compares to 1,893 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
King 1983 108,179 Urban freeway/expressway Sw Spokane St over Duwamish River W Waterwy
King 1965 73,221 Urban Interstate I-5 over King-Jackson St
King 1989 65,462 Urban Interstate Homer M. Hadley Memorial Bridge
King 1966 56,452 Urban freeway/expressway SR 520 over 116th Ave Ne
King 1967 53,809 Urban freeway/expressway SR 167 over Cmstpp RR
King 1996 48,315 Urban freeway/expressway SR 99 over Duwamish River
Lewis 1953 42,009 Rural Interstate I-5 over Lacamas Cr, Drews Pr Rd
Spokane 1963 40,568 Urban Interstate I-90 over Hangman Creek
King 1952 40,000 Urban other principal arterial S Boeing Access Rd over Airport Way Bar Ramp
Clark 1939 38,419 Rural Interstate I-5 over E Fork Lewis River
Clark 1940 38,419 Rural Interstate I-5 over Lewis River
King 1930 36,000 Urban other principal arterial Eastlake Ave NE over NE 40th St, Burke Gilman
King 1915 35,000 Urban other principal arterial Eastlake Ave NE over Portage Bay
Spokane 1963 34,707 Urban Interstate I-90 over Hangman Creek
King 1976 32,179 Urban Interstate I-90 over E Fk Issaquah Creek
King 1976 31,543 Rural Interstate I-90 over Game Crossing
Cowlitz 1972 31,450 Urban Interstate I-5 over Log Dump Rd & Bn Ry
Pierce 1934 29,454 Urban other principal arterial SR 167 over BNSF RR
Pierce 1959 27,805 Urban other principal arterial Gravelly Lake Dr over BNRR (Np)
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
Skagit 1963 22,561 Rural Interstate I-5 over Samish River, Pvt Rd
Pierce 1936 21,774 Urban other principal arterial SR 302 over Henderson Bay
Spokane 1960 21,200 Urban other principal arterial Sullivan Rd over SR 290 (Trent Ave)
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 286 350,956 4,888,236 30 36,164 456,365
Rural arterial 531 494,992 3,207,566 42 60,516 213,812
Rural minor arterial 327 225,387 1,301,043 27 22,186 91,931
Rural major collector 1,316 533,089 2,219,892 77 30,536 94,121
Rural minor collector 760 199,638 448,990 24 5,080 13,487
Rural local road 2,320 418,879 493,857 107 15,581 15,579
Urban Interstate 661 1,763,839 28,010,468 16 85,345 363,779
Urban freeway/expressway 507 1,326,334 13,967,804 14 58,389 421,438
Urban other principal arterial 505 905,643 9,454,336 32 119,698 470,381
Urban minor arterial 544 596,298 5,247,248 26 23,614 220,519
Urban collector 292 211,220 1,412,970 13 9,639 59,588
Urban local road 289 120,945 446,028 8 2,609 7,295
Total 8,338 7,147,219 71,098,438 416 469,358 2,428,295
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 2,204 $3,000 6,130,092 930,530
Widening & rehabilitation 187 $276 915,798 131,292
Rehabilitation 3,512 $10,705 60,719,320 5,287,680
Deck rehabilitation/replacement 246 $361 887,297 162,092
Other structural work 657 $572 1,183,284 256,317
Total 6,806 $14,914 69,835,791 6,767,910

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on March 11, 2021. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections. Cost estimates were downloaded by ARTBA on March 11, 2021.

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 2019 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 repair cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient. Please note that for a few states, the number of bridges needing to be repaired can vary significantly from year to year, and reflects the data entered by the state.

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.

Compared to 40 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
37. Maryland 5.0%
38. Washington 5.0%
39. Minnesota 4.9%

Compared to 34 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
30. North Dakota 444
31. Washington 416
32. Florida 408

Compared to 20 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
20. New Hampshire 7.0%
21. Washington 7.0%
22. North Carolina 7.0%
Full State Ranking


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on March 11, 2021. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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