National Bridge Inventory: Minnesota



  • Of the 13,346 bridges in the state, 631, or 4.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 785 bridges classified as structurally deficient in 2015.
  • The deck area of structurally deficient bridges accounts for 3.4 percent of total deck area on all structures.
  • 18 of the structurally deficient bridges are on the Interstate Highway System.
  • 1,308 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,685 bridges at an estimated cost of $1.7 billion.
  • This compares to 3,254 bridges that needed work in 2015.

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 1957 52,500 Urban Interstate I 35W NB over 106th St W
Hennepin 1957 52,500 Urban Interstate I 35W SB over 106th St W
Washington 1966 44,000 Urban Interstate I 694 NB over I 94; Collector Roads
Washington 1966 44,000 Urban Interstate I 694 SB 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 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
Ramsey 1926 17,600 Urban minor arterial Robert St (US952A) over Mississippi River; RR
Anoka 1996 17,600 Urban minor arterial Foley Blvd over US 10, Ramp; Mn 47
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
Hennepin 1979 16,200 Urban minor arterial Csah 15 over Browns Bay-Tanager Lk Ch
Hennepin 1923 14,800 Urban minor arterial Csah 152(Wash Ave) over Bassett Creek Tunnel
Hennepin 1917 14,500 Urban minor arterial Th 65 (3rd Ave S) over Miss Rvr, City St
Anoka 1988 13,700 Urban minor arterial Csah 18 over Coon Creek
Anoka 1972 12,290 Urban collector Msas 116 over BNSF RR
Hennepin 1964 11,600 Urban minor arterial Csah 19 over Narrows Chan; Circle Rd
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 290 279,539 3,376,476 6 3,720 50,900
Rural arterial 696 512,244 4,205,821 13 4,390 65,050
Rural minor arterial 1,017 484,495 2,696,798 18 8,968 35,865
Rural major collector 1,961 705,174 1,944,356 116 29,859 82,125
Rural minor collector 1,323 381,886 494,797 90 14,018 20,982
Rural local road 5,690 887,853 582,679 306 43,832 31,717
Urban Interstate 431 956,292 17,193,457 12 11,102 625,550
Urban freeway/expressway 230 608,849 8,579,778 1 1,980 68,000
Urban other principal arterial 352 633,826 6,660,485 6 17,732 109,200
Urban minor arterial 646 1,204,970 7,960,896 32 84,197 317,522
Urban collector 320 308,100 1,738,715 12 10,347 54,800
Urban local road 390 206,859 914,508 19 6,565 26,292
Total 13,346 7,170,087 56,348,766 631 236,709 1,488,003
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 8 $1 1,738 475
Widening & rehabilitation 1 $0 1,550 96
Rehabilitation 634 $385 1,488,286 237,206
Deck rehabilitation/replacement 3 $0 62 268
Other structural work 2,039 $1,332 9,642,095 821,450
Total 2,685 $1,719 11,133,731 1,059,495

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), released April 2, 2020. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections. Cost estimates were updated by ARTBA on April 14, 2020.

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 2018 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 2018

in the nation in % of structurally deficient bridges

1. Rhode Island 22.3%
38. Arkansas 4.9%
39. Minnesota 4.7%
40. Washington 4.6%

24
Compared to 24 in 2018

in the nation in # of structurally deficient bridges

1. Iowa 4,575
23. Alabama 654
24. Minnesota 631
25. Arkansas 626

43
Compared to 43 in 2018

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 23.0%
42. Oregon 3.0%
43. Minnesota 3.0%
44. Kansas 3.0%
Full State Ranking

  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), released April 2, 2020. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections. 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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