National Bridge Inventory: Oregon



  • Of the 8,161 bridges in the state, 422, or 5.2 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 403 bridges classified as structurally deficient in 2014.
  • 6 of the structurally deficient bridges are on the Interstate Highway System.
  • 432 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,007 bridges at an estimated cost of $1.8 billion.
  • This compares to 1,941 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Clackamas 1926 156,100 Rural major collector Bull Run Rd over Bull Run River
Multnomah 1959 118,000 Urban minor arterial Multnomah Blvd over Hwy 1 I-5
Multnomah 1916 70,600 Urban other principal arterial OR 99E(Hwy 1E) over Uprr
Multnomah 1908 70,600 Urban other principal arterial OR 99E (Hwy1E)Co over Hwy 2 & Uprr
Lane 1967 59,500 Urban Interstate I-105 (Hwy 227) over Future Hwy 62
Lane 1967 59,500 Urban Interstate 1-105 (Hwy 227) over Willamette River
Multnomah 1958 53,835 Urban minor arterial Morrison St over Willamette River
Washington 1983 40,600 Urban other principal arterial Hwy 29 over Johnson Creek
Multnomah 1958 35,300 Urban Interstate I-84 (Hwy 2) WB over NW Graham Rd
Josephine 1931 30,900 Urban other principal arterial US 199 (Hwy 025)SB over Rogue River
Multnomah 1962 29,600 Rural Interstate I-84 (Hwy 2) EB over McCord Creek
Multnomah 1913 29,371 Urban other principal arterial NW Broadway Ramp over Broadway St Conn
Hood River 1953 24,600 Urban Interstate I-84 (Hwy 2) EB over Hood River
Yamhill 1963 22,900 Urban other principal arterial Or 18 (Hwy 39) over Yamhill River Oflow
Washington 1981 21,700 Urban minor arterial Allen Blvd over Hwy 144
Clackamas 1940 20,200 Urban other principal arterial OR 99E(Hwy 1E) over Partial Viaduct
Multnomah 1968 17,879 Urban other principal arterial Columbia Blvd over B-79 X N. Columbia Way
Jackson 1962 17,000 Urban minor arterial Barnett Rd over I-5 (Hwy 1)
Lincoln 1934 15,300 Urban other principal arterial US101 (Hwy 9) over Yaquina Bay
Yamhill 1951 15,000 Rural arterial Or 18-Hwy 483 over S Yamhill River
Lane 1956 14,100 Urban other principal arterial I-5 (Hwy 1) Co over Corp
Umatilla 1955 14,000 Rural Interstate I-82 (Hwy 070) EB over Columbia River
Multnomah 1910 13,700 Urban minor arterial Hwy 1W (Steel Br) over Willamette River
Washington 1959 13,600 Urban minor arterial Cedar Hills Blvd over Beaverton Creek
Clackamas 1933 12,000 Urban minor arterial Holly Ln over Abernethy 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 363 441,550 10,380,850 2 10,720 43,600
Rural arterial 701 629,763 4,716,869 10 6,491 72,537
Rural minor arterial 503 316,350 1,954,976 9 5,622 38,156
Rural major collector 1,375 542,617 2,246,621 69 25,388 242,294
Rural minor collector 930 232,634 480,199 55 10,285 21,176
Rural local road 2,575 444,421 487,790 200 28,288 27,436
Urban Interstate 307 941,916 20,518,672 4 10,231 178,900
Urban freeway/expressway 74 150,506 3,763,700 0 0 0
Urban other principal arterial 336 560,191 6,983,627 14 35,738 355,750
Urban minor arterial 436 490,988 6,056,588 26 35,430 316,970
Urban collector 353 211,127 2,004,809 20 7,501 56,849
Urban local road 208 98,268 737,520 13 11,959 6,724
Total 8,161 5,060,329 60,332,221 422 187,653 1,360,392
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 323 $430 1,675,117 208,046
Widening & rehabilitation 1,128 $1,338 15,778,610 1,226,811
Rehabilitation 222 $28 523,022 70,773
Deck rehabilitation/replacement 3 $0 510 345
Other structural work 331 $8 17,779 63,835
Total 2,007 $1,804 17,995,038 1,569,810

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.

36
from 39 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
35. Kansas 5.2%
36. Oregon 5.2%
37. Maryland 5.1%

32
from 33 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
31. North Dakota 469
32. Oregon 422
33. Montana 390
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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