National Bridge Inventory: Hawaii



  • Of the 1,153 bridges in the state, 84, or 7.3 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 62 bridges classified as structurally deficient in 2016.
  • The deck area of structurally deficient bridges accounts for 2.6 percent of total deck area on all structures.
  • 3 of the structurally deficient bridges are on the Interstate Highway System. A total of 63.1 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.
  • 165 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 1,109 bridges at an estimated cost of $13.8 billion.
  • This compares to 1,104 bridges that needed work in 2016.

County Year Built Daily Crossings Type of Bridge Location
Honolulu 1934 58,500 Urban freeway/expressway Kal Hwy over Niu Strm
Honolulu 1952 57,600 Urban other principal arterial Nimitz Hwy over Slip Cover #4 Hon Hbr
Honolulu 1932 57,600 Urban other principal arterial Nimitz Hwy over Nuuanu Strm (W.B)
Honolulu 1949 57,600 Urban other principal arterial Nimitz Hwy over Kapalama Canal (E.B)
Honolulu 1936 42,700 Urban other principal arterial Kam Hwy over Waimalu Strm(East Bn)
Maui 1980 42,400 Urban other principal arterial Piilani Hwy over Waiakoa Gulch
Maui 1980 42,400 Urban other principal arterial Piilani Hwy over Waipuilani Gulch Br
Maui 1980 42,400 Urban other principal arterial Piilani Hwy over Kulanihakoi Gulch
Honolulu 1965 36,500 Urban other principal arterial Farr Hwy over Dbl Sectl Pl Culvt-Strm
Honolulu 1967 33,735 Urban other principal arterial Farr Hwy over Maipalaoa Strm
Honolulu 1929 31,925 Urban minor arterial Kalakaua Ave over Ala Wai Canal
Kauai 1945 31,600 Rural Interstate Kuhio Hwy over Wailua River
Honolulu 1949 26,100 Urban other principal arterial Farr Hwy over Mailiilii Strm
Honolulu 1976 24,400 Urban Interstate Quarry Access Rd over 3-84Rcp Culvt
Honolulu 1963 24,200 Urban other principal arterial Farr Hwy over Ulehawa Strm
Honolulu 1969 19,300 Urban other principal arterial Farr Hwy over Waiawa IC #3B FAI-H1
Honolulu 1937 18,800 Urban other principal arterial Farr Hwy over Kaupuni Strm
Kauai 1938 18,600 Rural minor arterial Kaumualii Hwy over Hanapepe River
Honolulu 1959 17,000 Urban other principal arterial Likelike Hwy over Kaneohe Str Dbl 10X8 Cbc
Hawaii 1950 16,600 Urban minor arterial Hawaii Belt Rd over Wailuku Strm
Honolulu 1922 16,500 Rural arterial Kam Hwy over Waiahole Strm(County)
Kauai 1967 12,900 Rural minor arterial Kuhio Hwy over Waiakalua Strm
Honolulu 1921 12,850 Rural arterial Kam Hwy over Anahulu Strm
Kauai 1928 12,108 Rural major collector Koloa Rd over Waikomo Strm(Koloa Br)
Honolulu 1930 12,100 Rural arterial Kam Hwy over Paumalu Strm
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 23 195,116 1,015,800 1 1,463 31,600
Rural arterial 78 35,343 1,085,434 7 1,387 78,635
Rural minor arterial 181 101,715 1,548,711 19 10,718 76,944
Rural major collector 128 26,295 400,288 8 1,163 22,038
Rural minor collector 31 5,309 89,999 4 298 2,122
Rural local road 120 28,865 71,958 17 2,775 10,720
Urban Interstate 186 748,035 15,221,860 2 1,498 31,400
Urban freeway/expressway 83 54,191 2,728,002 1 520 58,500
Urban other principal arterial 99 69,193 2,885,213 16 11,174 522,935
Urban minor arterial 43 53,734 756,440 2 2,498 48,525
Urban collector 74 22,681 487,334 1 140 9,543
Urban local road 107 22,412 247,212 6 1,268 14,051
Total 1,153 1,362,890 26,538,251 84 34,901 907,013
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 1 $1 500 50
Widening & rehabilitation 1 $3 775 166
Rehabilitation 7 $366 8,585 21,430
Deck rehabilitation/replacement 34 $91 491,135 7,940
Other structural work 1,066 $13,313 25,372,238 1,214,131
Total 1,109 $13,775 25,873,233 1,243,716

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.

23
Compared to 30 in 2019

in the nation in % of structurally deficient bridges

1. West Virginia 21.2%
22. New Jersey 7.4%
23. Hawaii 7.3%
24. Kentucky 7.2%

47
Compared to 47 in 2019

in the nation in # of structurally deficient bridges

1. Iowa 4,571
46. Arizona 132
47. Hawaii 84
48. Vermont 66

45
Compared to 47 in 2019

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 21.0%
44. Kansas 3.0%
45. Hawaii 3.0%
46. Alabama 2.0%
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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