National Bridge Inventory: North Dakota



  • Of the 4,355 bridges in the state, 469, or 10.8 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 512 bridges classified as structurally deficient in 2014.
  • 2 of the structurally deficient bridges are on the Interstate Highway System.
  • 890 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,417 bridges at an estimated cost of $243.6 million.
  • This compares to 1,473 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Grand Forks 1963 21,500 Urban other principal arterial US Highway 2 over Red River of The North
Ward 1962 12,650 Urban other principal arterial US Highway 83 over BNRR-CP-Mouse River
Ward 1971 12,650 Urban other principal arterial US Highway 83 over BNRR-CP-Mouse River
Grand Forks 1928 5,400 Rural arterial US Highway 2 over Saltwater Coulee
Cass 1960 4,750 Urban other principal arterial US Highway 10 over I-94/W.Fargo Int.
Grand Forks 1950 4,650 Rural Interstate Interstate 29 over County Drain No 11
Cass 1960 2,650 Rural minor arterial ND Highway 18 over I-94/Casselton Int
Traill 1977 2,010 Rural arterial ND Highway 2 over Goose River
Pembina 1958 1,475 Rural Interstate Interstate 29 over Drain Ditch
Stark 1979 1,460 Rural minor arterial ND Highway 22 over Antelope Creek
Traill 1971 830 Rural arterial ND Highway 2A over BNRR Separation overhead
Cass 1985 700 Rural minor arterial ND Highway 18 over Maple River
Dunn 1957 570 Rural arterial ND Highway 2 over Creek
Richland 1956 540 Rural minor arterial ND Highway 127 over Creek
Traill 1932 510 Rural minor arterial ND Highway 18 over County drainage Ditch
Hettinger 1912 500 Rural local road County Road over Cannonball River
Traill 1932 480 Rural minor arterial ND Highway 18 over County drainage Ditch
Benson 1936 450 Rural arterial US Highway 281 over BNRR Sep.
McHenry 1939 430 Rural major collector County Highway over Cut Bank Creek
Morton 1960 405 Rural major collector County Highway over Creek
Stutsman 1958 400 Rural minor arterial ND Highway 30 over I 94/Streeter Interchg
Traill 1957 340 Rural major collector County Highway over Red River of The North
Walsh 1940 300 Rural local road County Road over Creek
Traill 1939 270 Rural major collector County Highway over Red River of The North
McKenzie 1979 260 Rural major collector ND Highway 1806 over Cherry 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 148 89,274 658,270 2 287 6,125
Rural arterial 360 189,979 682,481 5 1,946 9,260
Rural minor arterial 254 109,939 247,115 7 3,167 6,740
Rural major collector 881 243,765 238,731 26 6,633 3,989
Rural minor collector 10 2,000 785 1 152 200
Rural local road 2,443 345,883 210,039 421 38,864 9,746
Urban Interstate 59 82,168 757,935 0 0 0
Urban freeway/expressway 0 0 0 0 0 0
Urban other principal arterial 78 148,150 1,249,000 4 16,528 51,550
Urban minor arterial 66 84,628 373,024 0 0 0
Urban collector 21 14,568 57,570 0 0 0
Urban local road 35 10,584 39,247 3 283 370
Total 4,355 1,320,937 4,514,197 469 67,859 87,980
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 563 $166 34,612 88,060
Widening & rehabilitation 419 $27 156,462 86,962
Rehabilitation 358 $30 270,220 83,118
Deck rehabilitation/replacement 23 $3 73,205 21,961
Other structural work 54 $17 113,008 31,613
Total 1,417 $244 647,507 311,714

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.

10
from 10 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
9. Oklahoma 11%
10. North Dakota 10.8%
11. Michigan 10.7%

31
from 29 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
30. Colorado 473
31. North Dakota 469
32. Oregon 422
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.
  • Privacy & Cookies Policy
Connect With Us

Copyright © 2019 American Road & Transportation Builders Association