California Congressional District 10


  • Of the 1,284 bridges in the counties of this district, 98, or 7.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is down from 107 bridges classified as structurally deficient in 2021.
  • Repairs are needed on 105 bridges in the district, which will cost an estimated $755.2 million.
  • This compares to 113 bridges that needed work in 2021.
  • There currently are now projects in the District that use IIJA formula bridge funds.

Top Most Traveled Structurally Deficient Bridges in California

County Year Built Daily Crossings Type of Bridge Location
Contra Costa 1998 235,000 Urban Interstate Interstate 680 over Monument Boulevard
Alameda 1958 225,000 Urban Interstate Interstate 880 over Crandall Creek
Alameda 1957 198,000 Urban Interstate Interstate 880 over Patterson Slough
Contra Costa 1964 192,200 Urban Interstate Interstate 680 over Laurel Drive
Contra Costa 1956 179,000 Urban Interstate Interstate 80 over El Portal Drive
Contra Costa 1958 179,000 Urban Interstate Interstate 80 over State Route 4 & Ramps
Contra Costa 1962 169,000 Urban Interstate Interstate 680 over Grayson Creek
Alameda 1967 142,000 Rural Interstate Interstate 680 over State Route 84 SB & Off
Alameda 1967 136,000 Urban Interstate Interstate 680 over Bernal Ave
Contra Costa 1962 130,000 Urban Interstate Interstate 680 over Willow Pass Road
Contra Costa 1962 130,000 Urban Interstate Interstate 680 over Center Ave
Alameda 1967 124,000 Rural Interstate Interstate 680 over Happy Valley Road
Alameda 1967 122,000 Urban Interstate Interstate 680 over Pleasanton-Sunol Road
Contra Costa 1962 118,000 Urban Interstate Interstate 680 over Blum Road
Contra Costa 1958 115,000 Urban Interstate Interstate 80 over Willow Avenue
Contra Costa 1963 100,000 Urban freeway/expressway State Route 242 over Concord Avenue
Alameda 1991 99,000 Urban Interstate Interstate 580 over Cerrito Creek
Alameda 1988 98,500 Urban Interstate Interstate 580 WB over Crow Creek
Contra Costa 1957 79,500 Urban freeway/expressway State Route 24 over Brown Avenue
Contra Costa 1957 79,500 Urban freeway/expressway State Route 24 over EBmud Aqueduct
Contra Costa 1957 79,500 Urban freeway/expressway State Route 24 over El Nido Ranch Rd
Contra Costa 1970 79,500 Urban freeway/expressway State Route 24 WB over Lafayette Sta Puc(Bartd)
Contra Costa 1990 69,000 Urban Interstate Interstate 580 over BNSF Ry, South Second St
Contra Costa 1997 65,000 Urban Interstate S680-W24 Connector over N680-W24, Camino Diablo
Contra Costa 1963 63,800 Urban Interstate N680-N242 Connectr over Walnut Creek

Bridge Inventory: California

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 21 52,382 1,886,133 3 6,541 325,000
Rural arterial 8 7,595 308,188 2 1,612 12,512
Rural minor arterial 18 18,401 206,898 1 1,360 30,000
Rural major collector 23 12,488 108,776 4 3,428 16,415
Rural minor collector 6 1,996 11,586 2 532 4,647
Rural local road 42 35,930 98,253 7 3,355 12,492
Urban Interstate 316 1,392,987 34,969,866 33 98,252 3,064,750
Urban freeway/expressway 214 441,341 11,493,578 12 35,301 651,500
Urban other principal arterial 161 241,933 3,533,538 4 10,499 62,175
Urban minor arterial 201 264,068 3,030,177 16 36,685 273,253
Urban collector 106 68,746 668,299 7 4,465 39,659
Urban local road 168 80,678 672,865 7 2,681 25,479
Total 1,284 2,618,547 56,988,157 98 204,712 4,517,882

Proposed Bridge Work

Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 15 $99 103,452 19,418
Widening & rehabilitation 0 $0 0 0
Rehabilitation 82 $636 4,414,430 185,201
Deck rehabilitation/replacement 0 $0 0 0
Other structural work 8 $20 927 5,781
Total 105 $755 4,518,809 210,400

About the data:

Data includes information for the following area(s): Alameda, Contra Costa

Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on June 24, 2025. 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 2023 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.

34
Compared to 28 in 2024

in the nation in % of structurally deficient bridges

1. Iowa 19.0%
33. Oregon 5.0%
34. California 5.0%
35. Connecticut 5.0%

11
Compared to 7 in 2024

in the nation in # of structurally deficient bridges

1. Iowa 4,424
10. Kansas 1,301
11. California 1,284
12. Ohio 1,266

23
Compared to 15 in 2024

in the nation in % of structurally deficient bridge deck area

1. West Virginia 13.0%
22. South Carolina 6.0%
23. California 6.0%
24. North Carolina 6.0%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on June 24, 2025. 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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