National Bridge Inventory: Minnesota



  • Of the 13,471 bridges in the state, 661, or 4.9 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 776 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 4.2 percent of total deck area on all structures.
  • 19 of the structurally deficient bridges are on the Interstate Highway System. A total of 93.6 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.
  • 1,368 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,698 bridges at an estimated cost of $1.4 billion.
  • This compares to 3,189 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Dakota 1980 117,000 Urban Interstate I 494 over Th 156 (Concord Street)
Dakota 1959 96,000 Urban Interstate I 35W over UP RR, Cliff Rd (Csah32)
Anoka 1962 68,000 Urban freeway/expressway US 10 over Rum River
Hennepin 1964 67,000 Urban Interstate I 694 EB over Shingle Creek
Hennepin 1980 64,000 Urban Interstate I 94 EB over Shingle Creek
Hennepin 1964 64,000 Urban Interstate I 94 WB over Shingle Creek
Hennepin 1981 50,000 Urban Interstate I 494 EB over Minnesota River
Hennepin 1981 50,000 Urban Interstate I 494 WB over Minnesota River
Washington 1966 44,000 Urban Interstate I 694 NB over I 94; Collector Roads
Ramsey 1986 36,000 Urban other principal arterial US 61 over Bike Path
Hennepin 1967 34,500 Urban other principal arterial Th 55 EB over Cedar Ave
Hennepin 1967 34,500 Urban other principal arterial Th 55 EB over Franklin Ave
Hennepin 1972 22,700 Urban minor arterial Rockford Rd over US 169
St. Louis 1972 22,500 Urban other principal arterial US 53 over 19th; 20th St Conn
Hennepin 1927 18,700 Urban minor arterial Csah 158(Vernon A) over Cp Rail
Hennepin 1947 18,200 Urban other principal arterial Th 55 over Bassett Creek
Ramsey 1926 17,600 Urban minor arterial Robert St (US952A) over Mississippi River; RR
Ramsey 1936 17,300 Urban minor arterial Msas 158(Kellogg) over Msas 258(Exchange)
Dakota 1969 16,800 Urban minor arterial Burnsville Parkway over I 35W
Ramsey 1967 16,500 Urban minor arterial Vandalia(Msas 233) over Cp Rail
Blue Earth 1977 16,250 Urban freeway/expressway US 14 EB over N Riverfront Dr
Blue Earth 1977 16,250 Urban freeway/expressway US 14 WB over N Riverfront Dr
Hennepin 1979 16,200 Urban minor arterial Csah 15 over Browns Bay-Tanager Lk Ch
St. Louis 1961 15,100 Urban other principal arterial US 169 over Dm;Ir Ry
Hennepin 1923 14,800 Urban minor arterial Csah 152(Wash Ave) over Bassett Creek Tunnel
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 289 278,423 3,380,775 8 5,077 71,700
Rural arterial 695 511,508 4,194,571 16 5,991 77,600
Rural minor arterial 1,017 485,017 2,718,423 20 10,013 46,015
Rural major collector 1,973 707,369 1,951,257 115 31,092 87,940
Rural minor collector 1,335 354,501 500,534 93 15,417 23,973
Rural local road 5,770 894,946 579,372 319 43,324 25,670
Urban Interstate 451 986,877 16,869,189 11 61,376 576,550
Urban freeway/expressway 224 587,820 8,537,098 3 4,033 100,500
Urban other principal arterial 346 628,244 6,560,485 11 13,973 181,950
Urban minor arterial 650 1,150,451 8,033,886 33 85,764 329,229
Urban collector 321 306,604 1,713,437 15 10,892 65,700
Urban local road 400 214,229 899,131 17 4,330 24,742
Total 13,471 7,105,990 55,938,158 661 291,282 1,611,569
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 7 $1 1,732 442
Widening & rehabilitation 1 $0 1,550 96
Rehabilitation 662 $369 1,611,574 291,338
Deck rehabilitation/replacement 3 $0 62 268
Other structural work 2,025 $1,043 9,448,884 814,977
Total 2,698 $1,413 11,063,802 1,107,120

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.

39
Compared to 38 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
38. Washington 5.0%
39. Minnesota 4.9%
40. Oregon 4.8%

24
Compared to 24 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
23. Arkansas 663
24. Minnesota 661
25. Alabama 620

34
Compared to 43 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
33. North Dakota 4.0%
34. Minnesota 4.0%
35. Mississippi 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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