National Bridge Inventory: Oregon



  • Of the 8,214 bridges in the state, 395, or 4.8 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 398 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 3.5 percent of total deck area on all structures.
  • 6 of the structurally deficient bridges are on the Interstate Highway System. A total of 93.2 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.
  • 545 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,999 bridges at an estimated cost of $2.7 billion.
  • This compares to 1,981 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Clackamas 1926 152,800 Rural major collector Bull Run Rd over Bull Run River
Lane 1967 59,900 Urban Interstate 1-105 (Hwy 227) over Willamette River
Lane 1967 59,900 Urban Interstate I-105 (Hwy 227) over Future Hwy 62
Multnomah 1958 55,335 Urban minor arterial Morrison St over Willamette River
Multnomah 1913 30,388 Urban other principal arterial NW Broadway Ramp over Broadway St Conn
Lincoln 1949 24,900 Urban other principal arterial US101 (Hwy 9) over Devils Lake Outlet
Yamhill 1963 22,900 Urban other principal arterial Or 18 (Hwy 39) over Yamhill River overflow
Washington 1981 21,400 Urban minor arterial Allen Blvd over Hwy 144
Clackamas 1940 21,200 Urban other principal arterial OR 99E(Hwy 1E) over Partial Viaduct
Multnomah 1968 19,379 Urban other principal arterial Columbia Blvd over B-79 X N. Columbia Way
Lane 1965 17,868 Urban minor arterial Goodpasture IS Rd over FAU 1335 Delta Highway
Multnomah 1909 17,787 Urban minor arterial US 30 By (Hwy 123) over BNSF
Lane 1973 17,500 Urban other principal arterial Hwy 69 over Willow Creek
Multnomah 1958 16,400 Urban Interstate I-84 (Hwy 2) WB over NW Graham Rd
Yamhill 1951 16,200 Rural arterial Or 18-Hwy 483 over South Yamhill River
Hood River 1953 15,700 Urban Interstate I-84 (Hwy 2) EB over Hood River
Multnomah 1916 15,500 Urban other principal arterial OR 99E(Hwy 1E) over Uprr
Lincoln 1934 15,100 Urban other principal arterial US101 (Hwy 9) over Yaquina Bay
Jackson 1962 14,900 Urban minor arterial Barnett Rd over I-5 (Hwy 1)
Multnomah 1962 13,350 Rural Interstate I-84 (Hwy 2) EB over McCord Creek
Clackamas 1948 13,000 Rural minor arterial OR 224 (Hwy 171) over Deep Creek
Marion 1930 12,837 Rural arterial Silverton Road over Little Pudding River
Multnomah 1910 11,700 Urban minor arterial Hwy 1W (Steel Br) over Willamette River
Multnomah 1962 11,700 Urban minor arterial Or 99W (Hwy 1W) over Victory Blvd
Linn 1940 11,330 Urban minor arterial Salem Ave over Cox Creek
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 363 441,646 6,099,590 2 10,720 24,150
Rural arterial 711 634,384 4,288,469 9 6,496 70,937
Rural minor arterial 502 316,891 2,012,208 9 5,951 45,544
Rural major collector 1,379 546,276 2,461,768 58 18,352 216,508
Rural minor collector 932 233,310 551,367 52 10,062 17,613
Rural local road 2,598 447,181 560,563 196 30,252 33,439
Urban Interstate 307 934,320 14,209,922 4 10,231 151,900
Urban freeway/expressway 74 150,537 3,208,850 0 0 0
Urban other principal arterial 352 591,337 6,965,317 14 36,674 211,067
Urban minor arterial 437 489,709 6,218,395 26 26,047 222,223
Urban collector 352 211,758 2,075,974 18 10,631 66,033
Urban local road 207 102,042 725,914 7 11,043 8,935
Total 8,214 5,099,391 49,378,337 395 176,460 1,068,349
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 299 $505 1,427,499 208,697
Widening & rehabilitation 1,120 $1,921 12,873,049 1,221,729
Rehabilitation 215 $123 361,785 70,115
Deck rehabilitation/replacement 4 $2 1,510 941
Other structural work 361 $123 19,140 67,506
Total 1,999 $2,674 14,682,983 1,568,988

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.

40
Compared to 36 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
39. Minnesota 4.9%
40. Oregon 4.8%
41. Tennessee 4.4%

33
Compared to 32 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
32. Florida 408
33. Oregon 395
34. Montana 377

39
Compared to 33 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
38. Indiana 4.0%
39. Oregon 4.0%
40. Virginia 3.0%
Full State Ranking

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  • 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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