National Bridge Inventory: Minnesota
- Of the 13,497 bridges in the state, 602, or 4.5 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
- This is down from 668 bridges classified as structurally deficient in 2018.
- The deck area of structurally deficient bridges accounts for 5.0 percent of total deck area on all structures.
- 20 of the structurally deficient bridges are on the Interstate Highway System. A total of 92.2 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.
- 1,265 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
- The state has identified needed repairs on 2,552 bridges at an estimated cost of $1.6 billion.
- This compares to 2,757 bridges that needed work in 2018.
County | Year Built | Daily Crossings | Type of Bridge | Location |
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Dakota | 1959 | 92,000 | Urban Interstate | I 35W over UP RR, Cliff Rd (Csah32) |
Anoka | 1962 | 66,000 | Urban freeway/expressway | US 10 over Rum River |
Hennepin | 1981 | 46,000 | Urban Interstate | I 494 over Minnesota River |
Hennepin | 1981 | 46,000 | Urban Interstate | I 494 over Minnesota River |
Ramsey | 1964 | 42,500 | Urban freeway/expressway | Mn 36 over I 35W |
Hennepin | 1967 | 39,000 | Urban other principal arterial | Mn 55 over Franklin Ave |
Blue Earth | 1976 | 39,000 | Urban freeway/expressway | US 14 over Th 169 |
Hennepin | 1967 | 39,000 | Urban other principal arterial | Mn 55 over Cedar Ave |
Blue Earth | 1976 | 39,000 | Urban freeway/expressway | US 14 over Minn River; UP RR |
Ramsey | 1986 | 38,500 | Urban other principal arterial | US 61 over Bike Path |
St. Louis | 1961 | 33,021 | Urban Interstate | I 535 over St Louis R; RR,Street |
St. Louis | 1968 | 24,100 | Urban other principal arterial | Mn 194 over Superior St(Msas171) |
St. Louis | 1972 | 22,800 | Urban other principal arterial | US 53 over 19th; 20th St Conn |
Hennepin | 1972 | 22,700 | Urban minor arterial | Csah 9 over US 169 |
Blue Earth | 1985 | 20,700 | Urban minor arterial | Unu 169 over Minn R, UP RR; Street |
Polk | 1963 | 18,900 | Urban other principal arterial | US 2 over Red River |
Hennepin | 1927 | 18,700 | Urban minor arterial | Csah 158 over Cp Rail |
Anoka | 1958 | 18,037 | Urban other principal arterial | Mn 65 over Coon Creek |
Ramsey | 1926 | 17,600 | Urban minor arterial | Mn 3 over Mississippi River; RR |
Ramsey | 2009 | 17,445 | Urban minor arterial | Csah 49 over BNSF RR |
Ramsey | 1936 | 17,300 | Urban minor arterial | Msas 158 over Msas 258(Exchange) |
Dakota | 1969 | 16,800 | Urban minor arterial | Msas 102 over I 35W |
Ramsey | 1967 | 16,500 | Urban minor arterial | Msas 233 over Cp Rail |
Blue Earth | 1977 | 16,250 | Urban freeway/expressway | US 14 over N Riverfront Dr |
Grant | 1963 | 15,300 | Rural Interstate | I 94 over Pelican 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 | 220 | 186,065 | 2,319,601 | 9 | 4,771 | 89,105 |
Rural arterial | 627 | 405,721 | 3,358,540 | 13 | 7,110 | 70,439 |
Rural minor arterial | 1,037 | 472,862 | 2,389,537 | 24 | 17,447 | 44,223 |
Rural major collector | 1,892 | 627,659 | 1,589,118 | 80 | 24,264 | 63,005 |
Rural minor collector | 1,318 | 342,620 | 398,073 | 74 | 14,166 | 24,712 |
Rural local road | 5,602 | 825,047 | 410,895 | 293 | 35,383 | 18,837 |
Urban Interstate | 514 | 1,080,402 | 18,000,102 | 11 | 107,032 | 270,571 |
Urban freeway/expressway | 323 | 714,331 | 11,321,608 | 6 | 17,522 | 217,500 |
Urban other principal arterial | 282 | 523,201 | 4,814,767 | 14 | 23,158 | 232,671 |
Urban minor arterial | 765 | 1,349,501 | 9,482,318 | 33 | 85,672 | 344,485 |
Urban collector | 518 | 414,340 | 2,136,648 | 21 | 13,742 | 85,048 |
Urban local road | 399 | 187,193 | 660,504 | 24 | 8,413 | 36,820 |
Total | 13,497 | 7,128,943 | 56,881,711 | 602 | 358,680 | 1,497,416 |
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 | 603 | $526 | 1,497,421 | 358,735 |
Deck rehabilitation/replacement | 2 | $0 | 47 | 168 |
Other structural work | 1,939 | $1,093 | 9,197,423 | 775,548 |
Total | 2,552 | $1,620 | 10,698,173 | 1,134,989 |
About the data:
Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on February 1, 2023. 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 2021 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.
40
Compared to 40 in 2021
in the nation in % of structurally deficient bridges
1. West Virginia | 20.0% |
---|---|
39. Ohio | 5.0% |
40. Minnesota | 5.0% |
41. Tennessee | 4.0% |
23
Compared to 23 in 2021
in the nation in # of structurally deficient bridges
1. Iowa | 4,604 |
---|---|
22. Arkansas | 674 |
23. Minnesota | 602 |
24. Alabama | 575 |
27
Compared to 33 in 2021
in the nation in % of structurally deficient bridge deck area
1. Rhode Island | 17.0% |
---|---|
26. Arkansas | 5.0% |
27. Minnesota | 5.0% |
28. Kentucky | 5.0% |
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