National Bridge Inventory: California Congressional District 10


  • Of the 1,020 bridges in the counties of this district, 127, or 12.5 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
  • This is up from 98 bridges classified as structurally deficient in 2017.
  • 9 bridges are posted for load, which may restrict the size and weight of vehicles crossing the structure.
  • Repairs are needed on 127 bridges in the district, which will cost an estimated $849.8 million.
  • This compares to 217 bridges that needed work in 2017.

County Year Built Daily Crossings Type of Bridge Location
San Joaquin 1972 113,000 Urban Interstate Interstate 5 SB over Weber,Pershing,Fremont
San Joaquin 1970 113,000 Urban Interstate Interstate 5 over Monte Diablo Ave
Stanislaus 1965 101,000 Urban freeway/expressway State Route 99 over SB 99-North St Off Ramp
Stanislaus 1965 101,000 Urban freeway/expressway State Route 99 over Second St-SB 99 On Ramp
Stanislaus 1976 71,797 Urban other principal arterial Briggsmore Road over UP RR & Brink Avenue
San Joaquin 1969 71,500 Rural Interstate Interstate 5 NB over Paradise Cut
Stanislaus 1963 52,500 Urban freeway/expressway State Route 99 SB over Tuolumne Blvd
Stanislaus 1963 52,500 Urban freeway/expressway State Route 99 NB over Tuolumne Blvd
San Joaquin 1975 48,000 Urban Interstate Interstate 5 NB over Mosher Slough
San Joaquin 1971 43,750 Urban Interstate Interstate 5 SB over Walker Slough
San Joaquin 1966 41,000 Urban other principal arterial West Lane over Calaveras River
San Joaquin 1966 41,000 Urban other principal arterial West Lane over Calaveras River
San Joaquin 1975 38,500 Urban Interstate Interstate 5 SB over Mcauliffe Rd
San Joaquin 1980 37,500 Rural arterial SR 120 EB over UP RR & Ace
Stanislaus 1958 37,377 Urban other principal arterial Mitchell Road over Tuolumne River
San Joaquin 1972 37,000 Urban freeway/expressway SR 4 WB over Lincoln, UP RR, BNSF Ry
San Joaquin 1970 32,500 Rural Interstate E205-N5 Connector over Interstate 5
San Joaquin 1962 31,000 Urban other principal arterial El Dorado St over Bianchi Road
San Joaquin 1959 29,900 Urban collector Pershing Ave over Calaveras River
San Joaquin 1963 29,500 Urban freeway/expressway State Route 99 NB over Route 12 - Kettleman Ln
San Joaquin 1967 28,500 Rural Interstate Interstate 5 NB over Gaffery Road
San Joaquin 1979 25,000 Rural Interstate Interstate 5 NB over Beaver Slough
San Joaquin 1960 23,500 Urban local road Thornton Road over Bear Creek
San Joaquin 1970 21,500 Rural Interstate E205-N5 Connector over Paradise Cut
Stanislaus 1967 20,500 Rural Interstate Interstate 5 NB over Ingram Creek
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 113 106,639 3,049,500 35 24,757 628,800
Rural arterial 40 63,970 889,826 7 8,343 92,600
Rural minor arterial 33 24,224 233,637 2 818 12,370
Rural major collector 169 95,007 605,152 19 19,582 70,601
Rural minor collector 90 29,063 85,302 12 3,762 10,862
Rural local road 217 57,312 198,031 14 4,795 11,774
Urban Interstate 79 151,177 4,945,003 5 19,952 356,250
Urban freeway/expressway 74 156,601 2,980,300 6 8,050 373,500
Urban other principal arterial 77 115,159 1,442,816 12 17,881 287,970
Urban minor arterial 45 48,553 474,679 5 7,556 32,687
Urban collector 43 36,571 256,286 8 7,974 83,119
Urban local road 40 44,420 176,327 2 3,401 31,800
Total 1,020 928,696 15,336,859 127 126,871 1,992,333
Type of Work Number of Bridges Cost to Repair
(in millions)
Daily Crossings Area of Bridges
(sq. meters)
Bridge replacement 28 $301.9 331,255 36,194
Widening & rehabilitation 0 $0.0 0 0
Rehabilitation 99 $547.9 1,661,078 90,677
Deck rehabilitation/replacement 0 $0.0 0 0
Other structural work 0 $0.0 0 0
Total 127 $849.8 1,992,333 126,871

Data includes information for the following area(s): San Joaquin County, Stanislaus County

About the data:

Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. 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 January 3, 2022.

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 2020 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.

27
Compared to 28 in 2020

in the nation in % of structurally deficient bridges

1. West Virginia 20.4%
26. Kentucky 6.9%
27. California 5.8%
28. Indiana 5.6%

8
Compared to 7 in 2020

in the nation in # of structurally deficient bridges

1. Iowa 4,504
7. Louisiana 1,631
8. California 1,493
9. West Virginia 1,490

22
Compared to 22 in 2020

in the nation in % of structurally deficient bridge deck area

1. Rhode Island 19.5%
21. District of Columbia 6.1%
22. California 5.9%
23. North Carolina 5.8%
Full State Ranking

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  • Source: Data is from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on January 3, 2022. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.

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