National Bridge Inventory: Delaware



  • Of the 863 bridges in the state, 34, or 3.9 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 48 bridges classified as structurally deficient in 2014.
  • 0 of the structurally deficient bridges are on the Interstate Highway System.
  • 24 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • The state has identified needed repairs on 342 bridges at an estimated cost of $755.8 million.
  • This compares to 349 bridges that needed work in 2014.

County Year Built Daily Crossings Type of Bridge Location
New Castle 1978 68,105 Urban other principal arterial SR 141 over Christina R.,Amtrak,SR 4
Sussex 1916 30,556 Rural arterial US 113/Dupont Blvd over Iron Branch
New Castle 1971 22,693 Urban minor arterial Red Mill Rd over stream Mill Pond
New Castle 1955 21,284 Urban other principal arterial Basin Rd/SR141 over US 13
New Castle 1973 18,393 Urban collector Harmony Rd over White Clay Creek
Sussex 1926 12,210 Rural major collector Front St over Nanticoke River
Kent 1965 11,822 Urban collector Lebanon Rd/SR10 WB over St. Jones River
New Castle 1963 10,708 Urban minor arterial Chapman Rd over I 95, Delaware Turnpike
Kent 1941 10,208 Rural arterial US Route 13 over C & D Canal
New Castle 1980 10,089 Urban minor arterial Fourth Street over Christina River
New Castle 1975 9,622 Urban collector Greenbank Rd over Red Clay Creek
New Castle 1920 9,612 Rural minor arterial Dupont Pkw/US13 SB over Blackbird Creek
New Castle 1959 9,073 Urban minor arterial Dupont Rd / SR1 over Delaware Valley RR
New Castle 1977 6,347 Urban other principal arterial 12th St over Norfolk Southern
Sussex 1923 6,292 Rural major collector Central Ave over Broad Creek
New Castle 1981 5,056 Urban collector Brick Mill Rd over Dove Nest Branch
Kent 1989 3,808 Rural minor collector Irish Hill Rd. over Thorndyk Ditch
New Castle 1988 3,193 Rural major collector Old Kennet Pike Rd over Waterway
New Castle 1988 3,037 Rural major collector Old Kennet Pike Rd over Waterway
Sussex 1970 3,013 Rural major collector Nine Foot Road over Whartons Branch
Sussex 1985 2,492 Rural local road Cedar Lane over Eli Walls Ditch
New Castle 1929 2,404 Urban local road James St. over Christina River
Kent 1967 2,374 Urban local road White Oak Rd over Little River
Sussex 1966 1,601 Urban local road Delaware Ave over Broad Creek
Sussex 1964 1,237 Urban other principal arterial US 9 over Delaware Bay
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 0 0 0 0 0 0
Rural arterial 82 231,789 2,441,360 2 21,258 40,764
Rural minor arterial 20 11,533 333,176 1 159 9,612
Rural major collector 89 43,859 377,918 5 931 27,745
Rural minor collector 28 4,551 77,977 1 64 3,808
Rural local road 182 25,998 181,965 7 353 4,331
Urban Interstate 93 338,530 3,851,567 0 0 0
Urban freeway/expressway 29 35,001 664,380 0 0 0
Urban other principal arterial 120 172,347 2,822,576 5 25,083 98,210
Urban minor arterial 73 76,482 931,087 4 6,479 52,563
Urban collector 82 37,195 570,261 6 2,855 46,124
Urban local road 65 23,070 148,038 3 1,301 6,379
Total 863 1,000,357 12,400,305 34 58,483 289,536
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 139 $260 2,555,344 119,569
Widening & rehabilitation 20 $23 253,580 18,777
Rehabilitation 151 $377 2,096,497 335,211
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 32 $95 740,807 77,399
Total 342 $756 5,646,228 550,956

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.

44
from 43 in 2017

in the nation in % of structurally deficient bridges

1. Rhode Island 23.1%
43. Alabama 4.3%
44. Delaware 3.9%
45. Georgia 3.3%

50
from 50 in 2017

in the nation in # of structurally deficient bridges

1. Iowa 4,675
49. Utah 66
50. Delaware 34
51. Nevada 27
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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