National Bridge Inventory: North Dakota



  • Of the 4,312 bridges in the state, 444, or 10.3 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 509 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 4.3 percent of total deck area on all structures.
  • 3 of the structurally deficient bridges are on the Interstate Highway System. A total of 97.5 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.
  • 786 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,386 bridges at an estimated cost of $485.6 million.
  • This compares to 1,460 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
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
Ward 1960 4,150 Urban other principal arterial US Highway 2 over Mouse River
Stutsman 1958 4,100 Urban Interstate Interstate 94 over BNRR Sep-Minor Road
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
Dickey 1941 850 Rural arterial US Highway 281 over South Fork-Maple River
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
Morton 1961 320 Rural major collector County Highway over I-94/Hebron Interchange
McHenry 1970 305 Rural major collector County Road 2511 over Hay Creek Coulee
Walsh 1940 300 Rural local road County Road over 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 147 90,550 654,220 2 288 6,125
Rural arterial 358 190,232 678,126 6 2,092 10,110
Rural minor arterial 253 109,737 253,570 7 3,169 6,740
Rural major collector 879 245,785 264,866 29 8,316 4,970
Rural minor collector 12 2,691 1,105 1 152 200
Rural local road 2,401 343,370 209,702 393 38,806 9,150
Urban Interstate 59 82,171 757,935 1 872 4,100
Urban freeway/expressway 0 0 0 0 0 0
Urban other principal arterial 79 146,680 800,111 2 1,850 8,900
Urban minor arterial 66 84,632 373,024 0 0 0
Urban collector 22 14,631 57,730 0 0 0
Urban local road 36 10,719 40,447 3 282 370
Total 4,312 1,321,196 4,090,836 444 55,827 50,665
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 527 $175 34,254 86,284
Widening & rehabilitation 411 $115 143,837 83,303
Rehabilitation 367 $120 267,931 84,928
Deck rehabilitation/replacement 22 $28 73,185 20,852
Other structural work 59 $48 108,088 32,236
Total 1,386 $486 627,295 307,604

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.

10
Compared to 10 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
9. Michigan 10.8%
10. North Dakota 10.3%
11. Oklahoma 10.0%

30
Compared to 31 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
29. Massachusetts 472
30. North Dakota 444
31. Washington 416

33
Compared to 26 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
32. New Mexico 4.0%
33. North Dakota 4.0%
34. Minnesota 4.0%
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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