National Bridge Inventory: Michigan

  • Of the 11,228 bridges in the state, 1,196, or 10.7 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 1,251 bridges classified as structurally deficient in 2014.
  • 62 of the structurally deficient bridges are on the Interstate Highway System.
  • 1,206 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 2,627 bridges at an estimated cost of $1.7 billion.
  • This compares to 2,749 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Wayne 1954 146,000 Urban minor arterial Second Blvd over I-94
Wayne 1963 114,656 Urban freeway/expressway M-39 over Rouge River
Wayne 1967 100,492 Urban Interstate I-75 over Rouge R,Dearborn St & RR
Wayne 1967 100,492 Urban Interstate I-75 over Fort St
Macomb 1955 82,735 Urban other principal arterial Mound Rd over Sharkey Drain
Wayne 1970 78,863 Urban Interstate I-96 WB Main Rdwy over M-39 (Southfield Expr)
Kalamazoo 1956 69,260 Urban Interstate I-94 over Portage Road
Oakland 1964 67,700 Urban freeway/expressway M-39 (Ramp H) over M-10 WB (Ramp G)
Oakland 1964 65,985 Urban Interstate I-75 SB over M-150 (Rochester Rd.)
Wayne 1962 65,737 Urban Interstate I-94 WB over Ecorse Rd
Jackson 1949 64,800 Urban Interstate I-94 over Conrail & Grand River
Wayne 1953 64,700 Urban freeway/expressway M-10 EB over I-94 Ramp
Wayne 1967 63,820 Urban other principal arterial US-24 Telegraph Rd over Rouge River
Genesee 1976 63,400 Urban Interstate I-475 over Stever - Broadway Aves
Wayne 1969 60,400 Urban other principal arterial M-102 8 mile Rd over I-75
Saginaw 1961 60,342 Urban Interstate I-75 over CSX RR
Wayne 1962 55,956 Urban Interstate I-94 WB over Wayne Rd
Wayne 1953 54,800 Urban Interstate I-94EB Rmp to M-10 over I-94 WB & M-10 SB
Jackson 1949 54,000 Urban local road Elm Rd over I-94
Wayne 1964 51,090 Urban Interstate I-75 NB over Blakely Drain
Wayne 1964 51,090 Urban Interstate I-75 SB over Blakely Drain
Wayne 1966 50,643 Urban Interstate I-75 SB over North Line Rd
Wayne 1966 47,466 Urban Interstate I-75 NB over Eureka Rd
Wayne 1966 47,466 Urban Interstate I-75 SB over Eureka Rd
Livingston 1962 44,600 Urban Interstate I-96 EB over Grand River Ave
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 402 367,407 7,936,065 12 7,530 265,994
Rural arterial 638 411,937 5,679,077 24 9,909 117,881
Rural minor arterial 618 298,832 3,175,058 46 21,013 182,163
Rural major collector 2,089 686,665 4,417,648 260 61,576 494,383
Rural minor collector 543 138,372 1,094,013 57 9,353 29,227
Rural local road 3,164 559,808 1,539,868 465 54,168 126,484
Urban Interstate 832 1,395,800 29,970,603 50 199,612 1,879,088
Urban freeway/expressway 319 336,206 8,370,127 12 12,989 441,036
Urban other principal arterial 713 879,390 15,617,613 67 99,711 1,429,972
Urban minor arterial 821 748,942 9,726,645 103 72,675 1,308,193
Urban collector 478 290,712 3,381,009 40 28,253 194,956
Urban local road 611 331,607 2,950,940 60 22,762 190,440
Total 11,228 6,445,678 93,858,666 1,196 599,552 6,659,817
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 666 $332 1,982,570 144,354
Widening & rehabilitation 77 $53 1,306,418 44,043
Rehabilitation 947 $480 5,470,860 516,099
Deck rehabilitation/replacement 771 $785 9,657,613 752,526
Other structural work 166 $56 650,720 84,617
Total 2,627 $1,705 19,068,181 1,541,639

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.

from 12 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
10. North Dakota 10.8%
11. Michigan 10.7%
12. North Carolina 10.2%

from 16 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
15. Indiana 1,203
16. Michigan 1,196
17. Wisconsin 1,054
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.
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