National Bridge Inventory: Oregon

  • Of the 8,235 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 down from 414 bridges classified as structurally deficient in 2017.
  • The deck area of structurally deficient bridges accounts for 3.2 percent of total deck area on all structures.
  • 4 of the structurally deficient bridges are on the Interstate Highway System. A total of 93.5 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.
  • 637 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,972 bridges at an estimated cost of $3.4 billion.
  • This compares to 2,004 bridges that needed work in 2017.

County Year Built Daily Crossings Type of Bridge Location
Multnomah 1958 55,335 Urban minor arterial Morrison St over Willamette River
Multnomah 1930 42,758 Urban minor arterial N Going Street over B-12 over UPRR Yards
Multnomah 1913 30,388 Urban other principal arterial NW Broadway Ramp over Broadway St Conn
Lincoln 1949 25,400 Urban other principal arterial US101 (Hwy 9) over Devils Lake Outlet
Washington 1981 21,700 Urban minor arterial Allen Blvd over Hwy 144
Clackamas 1940 21,300 Urban other principal arterial OR 99E (Hwy 81) over Partial Viaduct
Multnomah 1968 19,379 Urban other principal arterial Columbia Blvd over B-79 X N. Columbia Way
Lincoln 1934 19,200 Urban other principal arterial US101 (Hwy 9) over Yaquina Bay
Lane 1973 18,100 Urban other principal arterial Hwy 69 over Willow Creek
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
Multnomah 1916 17,600 Urban other principal arterial OR 99E(Hwy 1E) over Uprr
Linn 1921 17,100 Urban other principal arterial US 20 (Hwy 16) EB over Lebanon Ditch
Hood River 1953 16,300 Urban Interstate I-84 (Hwy 2) EB over Hood River
Yamhill 1951 16,100 Rural arterial Or 18-Hwy 483 over South Yamhill River
Washington 1960 14,741 Urban collector Sw 205th Ave over Beaverton Creek
Multnomah 1962 14,000 Rural Interstate I-84 (Hwy 2) EB over McCord Creek
Clackamas 1948 13,500 Rural minor arterial OR 224 (Hwy 171) over Deep Creek
Multnomah 1930 13,113 Urban minor arterial N Burgard St over B-1 over Up/Sprr
Marion 1930 12,837 Rural arterial Silverton Road over Little Pudding River
Union 1960 11,900 Rural Interstate I-84 (Hwy 6) over Hamilton Creek
Multnomah 1910 11,600 Urban minor arterial Hwy 1W (Steel Br) over Willamette River
Marion 1947 11,400 Rural major collector Scotts Mills Rd over Butte Creek
Linn 1940 11,330 Urban minor arterial Salem Ave over Cox Creek
Umatilla 1955 10,750 Rural Interstate I-82 (Hwy 070) EB over Columbia River
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 362 440,106 6,233,442 3 10,872 36,650
Rural arterial 714 634,345 4,380,800 8 6,124 53,208
Rural minor arterial 504 317,901 2,045,128 10 7,393 37,905
Rural major collector 1,381 547,811 2,299,459 61 20,789 73,791
Rural minor collector 933 232,872 563,411 54 10,658 17,532
Rural local road 2,602 449,244 561,809 183 29,041 29,369
Urban Interstate 306 922,664 14,352,423 1 1,336 16,300
Urban freeway/expressway 74 150,537 3,250,050 0 0 0
Urban other principal arterial 352 594,443 6,904,537 15 29,806 221,267
Urban minor arterial 439 490,909 6,282,555 25 26,898 259,836
Urban collector 356 213,079 2,203,197 15 9,319 67,280
Urban local road 212 103,137 753,249 7 11,043 8,935
Total 8,235 5,097,048 49,830,060 382 163,279 822,073
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 295 $603 1,294,448 201,708
Widening & rehabilitation 1,114 $2,581 12,974,415 1,220,253
Rehabilitation 208 $125 294,240 66,177
Deck rehabilitation/replacement 4 $2 1,510 941
Other structural work 351 $123 18,425 66,504
Total 1,972 $3,433 14,583,038 1,555,583

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. 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 January 3, 2022.

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 2020 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 36 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
38. Maryland 4.7%
39. Oregon 4.6%
40. Minnesota 4.6%

Compared to 32 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
32. Washington 401
33. Oregon 382
34. Montana 365

Compared to 33 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
40. Indiana 3.4%
41. Oregon 3.2%
42. Kansas 3.1%
Full State Ranking


  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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