National Bridge Inventory: Wisconsin



  • Of the 14,275 bridges in the state, 1,054, or 7.4 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 1,043 bridges classified as structurally deficient in 2014.
  • 35 of the structurally deficient bridges are on the Interstate Highway System.
  • 776 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,955 bridges at an estimated cost of $1.4 billion.
  • This compares to 1,984 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
Milwaukee 1960 124,000 Urban Interstate IH 43-N-S Freeway over Lrd Glendale Ave
Milwaukee 1959 124,000 Urban Interstate IH 43-N-S Freeway over Lrd W Hampton Ave
St. Croix 1972 73,000 Urban Interstate IH 94-USH 12-Sth 3 over Lrd Front St
St. Croix 1972 73,000 Urban Interstate IH 94-USH 12-Sth 3 over Sth 35 SB
Milwaukee 1967 50,000 Urban Interstate IH 41/Ush 45/Sth 1 over Lrd W Mill Rd
Milwaukee 1967 50,000 Urban Interstate IH 41/Ush 45/Sth 1 over Lrd W Mill Rd
Kenosha 1959 45,350 Rural Interstate IH 41 SB-IH 94 EB over Cth Kr
Racine 1959 38,800 Rural Interstate IH 41 SB/IH 94 EB over Sth 11
Kenosha 1959 38,800 Rural Interstate IH 41 NB-IH 94 WB over Cth Kr
Milwaukee 1969 35,262 Urban minor arterial Cth Pp W Good Hop over Br Milwaukee River
Dunn 1959 33,200 Rural Interstate IH 94 over E Br Wilson Creek
Milwaukee 1966 32,300 Urban other principal arterial Sth 36-Loomis Rd over IH 894-IH 43
Milwaukee 1934 26,595 Urban other principal arterial Sth 181-S 84th St over Honey Creek
Columbia 1961 26,100 Rural Interstate IH 39/90/94 NB over Sth 60
Rock 1961 23,800 Rural Interstate IH 39SB/90 EB over Lrd Newville Rd
Rock 1961 23,600 Rural Interstate IH 39SB/90EB over Cmstpp RR
Portage 1968 23,500 Urban other principal arterial Ush 10 over IH USH 51-IH 39
Rock 1959 23,200 Rural Interstate IH 90 EB over Turtle Creek
Douglas 1989 22,995 Urban other principal arterial Ush 2-USH 53-E 2nd over Lrd Service Road
Milwaukee 1939 22,889 Urban minor arterial Sth 38-Chase Ave over Cnw RR
Rock 1961 22,550 Urban Interstate IH 90 EB over USH 14
Dane 1961 22,200 Rural Interstate IH 90 WB over Cth B
Portage 1969 21,800 Urban Interstate IH Ush51-Ih39SB over Cth B
Waukesha 1959 21,245 Urban other principal arterial Cth X (Genesee Rd) over Pebble Creek
Waupaca 1965 20,400 Urban other principal arterial Ush10-Sth22/49/54E over Cth E
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 641 476,332 11,926,539 22 11,673 490,400
Rural arterial 1,167 848,507 8,670,056 24 12,212 87,465
Rural minor arterial 1,131 530,117 4,044,883 50 21,253 188,127
Rural major collector 1,798 561,184 2,964,382 218 53,722 258,573
Rural minor collector 720 169,671 646,672 96 20,344 62,704
Rural local road 5,887 978,402 2,150,436 493 56,989 102,937
Urban Interstate 653 1,159,046 22,256,349 13 18,747 593,450
Urban freeway/expressway 249 385,390 5,327,770 2 1,251 21,400
Urban other principal arterial 616 824,504 9,898,416 21 25,650 314,223
Urban minor arterial 639 667,837 6,775,555 50 55,038 522,469
Urban collector 210 129,797 1,206,305 22 7,681 61,541
Urban local road 564 276,004 2,203,529 43 10,062 92,400
Total 14,275 7,006,791 78,070,892 1,054 294,623 2,795,689
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1,931 $1,380 12,381,255 1,113,679
Widening & rehabilitation 0 $0 0 0
Rehabilitation 3 $0 284 301
Deck rehabilitation/replacement 15 $0 13,830 2,992
Other structural work 6 $0 1,382 737
Total 1,955 $1,381 12,396,751 1,117,709

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.

25
from 25 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
24. Montana 7.4%
25. Wisconsin 7.4%
26. Connecticut 7.2%

17
from 17 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
16. Michigan 1,196
17. Wisconsin 1,054
18. Kentucky 1,016
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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