Total bridges
3,547
Public highway bridges in Los Angeles County
County profile · official public datasets
Los Angeles County, CA
3,547 public highway bridges tracked in the FHWA National Bridge Inventory: 61.4% rated Good, 35.2% Fair, 3.4% Poor.
- 3,547
- Public bridges
- 61.4%
- Good condition
- 3.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Los Angeles County posts a top-quartile lowest Poor-condition share among rated counties in the state across large county bridge inventory.
- Top 12%
- lowest Poor share in state
- 3.4%
- Poor-condition share
- 3,547
- public highway bridges
- 1967
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Los Angeles County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Los Angeles County ranks #7 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.4%). Los Angeles County, California contains 3,547 public highway bridges. Roughly 61.4% are rated “Good,” 35.2% “Fair,” and 3.4% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Good condition
61.4%
2,178 of 3,547 rated 7-9
Fair condition
35.2%
1,249 of 3,547 rated 5-6
Poor condition
3.4%
120 of 3,547 rated 4 or below
In-state Poor-share rank
#7 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 3,547 NBI-tracked bridges by lowest applicable component rating.
Good 61.4% (2,178)
Fair 35.2% (1,249)
Poor 3.4% (120)
Los Angeles County's Poor-condition bridges carry 5,072,144 vehicle crossings a day
That is 2.2% of the county's reported daily bridge traffic on 3.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 42,268 crossings a day against 63,853 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 3,547 of 3,547 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
75.7% of Los Angeles County's bridges have passed the 50-year mark
2,685 of the 3,547 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 61.4% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
One structure carries 5.9% of the county's Poor-condition bridge traffic
INTERSTATE 110 over SLAUSON AVE & BNSF RY, built 1996, carries 300,000 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 120-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 5,072,144 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Los Angeles County's bridges were built
3,547 bridges with a recorded construction year, grouped by decade
- 1900s 7
1900–1909
7 bridges
- 1910s 13
1910–1919
13 bridges
- 1920s 80
1920–1929
80 bridges
- 1930s 168
1930–1939
168 bridges
- 1940s 163
1940–1949
163 bridges
- 1950s
1950–1959
685 bridges
- 1960s
1960–1969
1,137 bridges
- 1970s
1970–1979
632 bridges
- 1980s 229
1980–1989
229 bridges
- 1990s 219
1990–1999
219 bridges
- 2000s 117
2000–2009
117 bridges
- 2010s 78
2010–2019
78 bridges
- 2020s 19
2020–2029
19 bridges
What this shows Construction peaked in the 1960s, when 1,137 of the county's bridges still in the inventory were built, which is 32.1% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1967) matches the California average (1970).
How Los Angeles County compares with California's closest counties by inventory size
The 5 California counties nearest Los Angeles County in number of bridges, with their condition splits. Its 3.4% Poor share is the 4th-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1976 is 9 years older.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Los Angeles County (this page) | 3,547 | 61.4% | 35.2% | 3.4% | 1967 |
| San Diego County | 1,632 | 52.8% | 44.2% | 3.1% | 1977 |
| San Bernardino County | 1,422 | 41.9% | 52.1% | 6% | 1975 |
| Orange County | 1,164 | 53.2% | 43.8% | 3% | 1978 |
| Riverside County | 1,117 | 56.4% | 41.2% | 2.4% | 1977 |
| Santa Clara County | 964 | 38.3% | 56.1% | 5.6% | 1972 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Los Angeles County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for Los Angeles County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (3,547 bridges here).
- Dallas County, TX · 3,230 bridges
- Harris County, TX · 4,029 bridges
- Maricopa County, AZ · 2,847 bridges
- Tarrant County, TX · 2,617 bridges
Similar average build year
Nearest mean year-built outside CA (1967 here).
- Allegheny County, PA · avg 1967 · 1,294 bridges
- Suffolk County, MA · avg 1967 · 489 bridges
- Multnomah County, OR · avg 1967 · 473 bridges
- Le Flore County, OK · avg 1967 · 469 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (2,178)
STATE ROUTE 39
GoodOver: N FORK SAN GABRIEL RIVER
07-LA-039-32.50, Los Angeles, CA
Built 1932 Load: 24.3 t ADT: 220
STATE ROUTE 1
GoodOver: MARINA DITCH
07-LA-001-30.70-LA, Los Angeles, CA
Built 1932 Load: 24.3 t ADT: 60,000
STATE ROUTE 1
GoodOver: BIXBY SLOUGH
07-LA-001-12.01-LA, Los Angeles, CA
Built 1934 Load: 24.3 t ADT: 50,000
STATE ROUTE 14
GoodOver: AVENUE "S"
07-LA-014-R58.17, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 84,000
INTERSTATE 110
GoodOver: STORM DRAIN
07-LA-110-R1.41-LA, Los Angeles, CA
Built 1956 Load: 24.3 t ADT: 72,000
STATE ROUTE 14
GoodOver: ANAVERDE CREEK
07-LA-014-R59.11-PMDL, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 84,000
INTERSTATE 605
GoodOver: FOSTER ROAD
07-LA-605-R7.34-NRW, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 297,000
INTERSTATE 605 SB
GoodOver: SAN GABRIEL RIVER
07-LA-605-22.68-IRW, Los Angeles, CA
Built 1970 Load: 24.3 t ADT: 88,000
RTE 103
GoodOver: ANAHEIM STREET OH
07-LA-103-0.90-LA, Los Angeles, CA
Built 1947 Load: 24.3 t ADT: 14,427
WARDLOW RD
GoodOver: LOS CERRITOS DRN CH
0.3MI E/O CLARK AVE, Los Angeles, CA
Built 1962 Load: 24.3 t ADT: 12,463
HARVEY WAY
GoodOver: LOS CERRITOS DRN CHAN
0.4MI W/O BELLFLOWER BLVD, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 4,284
ARBOR RD
GoodOver: LOS CERRITOS DRN CHAN
0.4MI W/O BELLFLOWER BLVD, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 1,224
ATHERTON ST
GoodOver: STORM DRN #133
30FT W/O CLARK AVE, Los Angeles, CA
Built 1959 Load: 24.3 t ADT: 21,200
SEPULVEDA BLVD
GoodOver: FOX HILLS WASH
25FT S/O CENTINELA AVE, Los Angeles, CA
Built 1936 Load: 24.3 t ADT: 55,000
FIRESTONE BLVD
GoodOver: SILVERBOW STORM DRN
0.5MI SE/O SAN ANTONIO DR, Los Angeles, CA
Built 1934 Load: 24.3 t ADT: 26,842
SIERRA HWY
GoodOver: UNNAMED WASH
MM 4.00, Los Angeles, CA
Built 1921 Load: 24.3 t ADT: 4,141
SIERRA HWY
GoodOver: UNNAMED WASH
0.3MI N/O AVE E, Los Angeles, CA
Built 1921 Load: 24.3 t ADT: 3,838
SIERRA HWY
GoodOver: OBAN WASH
2.2MI S/O KERN CO LINE, Los Angeles, CA
Built 1921 Load: 24.3 t ADT: 3,838
THE OLD RD
GoodOver: GAVIN CYN CRK
0.1MI W/O I-5 FWY, Los Angeles, CA
Built 1928 Load: 24.3 t ADT: 10,841
CARSON ST
GoodOver: LOS CERRITOS DRN CHAN
0.4MI W/O BELLFLOWER BLVD, Los Angeles, CA
Built 1942 Load: 24.3 t ADT: 31,800
CARSON ST
GoodOver: PALO VERDE STORM DN
0.5MI E/O WOODRUFF AVE, Los Angeles, CA
Built 1950 Load: 24.3 t ADT: 29,786
CARSON ST
GoodOver: ARTESIA-NORWALK STORM DN
0.5MI E/O I-605 FWY, Los Angeles, CA
Built 1955 Load: 24.3 t ADT: 16,892
SOUTH ST
GoodOver: CLARK AVE DRN
0.5MI E/O LAKEWOOD BLVD, Los Angeles, CA
Built 1962 Load: 24.3 t ADT: 24,092
RIVERSIDE DR
GoodOver: CHINO CRK
0.3MI E/O TOWNE AVE, Los Angeles, CA
Built 1962 Load: 24.3 t ADT: 11,200
STAGE RD
GoodOver: LA MIRADA CHAN
0.5MI E/O VALLEY VIEW AVE, Los Angeles, CA
Built 1968 Load: 24.3 t ADT: 7,079
TELEGRAPH RD
GoodOver: SORENSON DRN
0.5MI E/O CARMENITA AVE, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 24,752
SANTA FE SPRINGS R
GoodOver: SORENSON DRN
1.0MI N/O TELEGRAPH RD, Los Angeles, CA
Built 1959 Load: 24.3 t ADT: 13,871
ALOSTA AVE
GoodOver: E BRANCH BIG DALTON WASH
1.2MI E/O GLENDORA AVE, Los Angeles, CA
Built 1968 Load: 24.3 t ADT: 30,352
EL SEGUNDO BLVD
GoodOver: DOMINGUEZ CHAN
100FT E/O CRENSHAW BLVD, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 26,857
CARSON ST
GoodOver: LAKEWOOD COUNTRY CLB PUC
0.5MI W/O LAKEWOOD BLVD, Los Angeles, CA
Built 1964 Load: 24.3 t ADT: 31,401
JOHN S GIBSON BLVD
GoodOver: STORM DRAIN
700 N CHANNEL ST, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 19,885
REDONDO BCH BLVD
GoodOver: DOMINGUEZ CHAN
0.3MI W/O CRENSHAW BLVD, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 26,624
CARMENITA RD
GoodOver: SORENSON DRN
0.5MI N/O TELEGRAPH RD, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 26,049
GREENLEAF AVE
GoodOver: SORENSON DRN
0.3MI S/O MULBERRY RD, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 10,229
CRENSHAW BLVD
GoodOver: DOMINGUEZ CHAN
0.3MI S/O REDONDO BEACH, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 32,240
CLARK AVE
GoodOver: KEYNOTE ST LATERAL
0.6MI S/O CARSON ST, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 22,790
SPRING ST
GoodOver: LOS CERRITOS DRN CHANN
0.3MI W/O BELLFLOWER BLVD, Los Angeles, CA
Built 1955 Load: 24.3 t ADT: 23,638
WARDLOW RD
GoodOver: PALO VERDE DRN
50FT W/O LOS COYOTES DIAG, Los Angeles, CA
Built 1958 Load: 24.3 t ADT: 14,760
TOWNE AVE
GoodOver: CHINO CRK
0.4MI S/O SR-60 FWY, Los Angeles, CA
Built 1968 Load: 24.3 t ADT: 8,900
TRIUNFO CYN RD
GoodOver: POTRERO VAL CR
0.8MI W/O LINDERO CYN RD, Los Angeles, CA
Built 1968 Load: 24.3 t ADT: 5,783
PUENTE ST
GoodOver: CHARTER OAK WASH
BARRANCA AVE, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 24,915
WARDLOW RD
GoodOver: NORWALK DRN CHAN
0.5MI S/O I-605 FWY, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 19,186
AVALON BLVD
GoodOver: PRIVATE DRN #669
0.6MI N/O I-405 FWY, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 25,348
VERMONT AVE
GoodOver: PRIVATE DRN #553
0.1MI S/O SEPULVEDA BL, Los Angeles, CA
Built 1967 Load: 24.3 t ADT: 29,610
SPRING ST
GoodOver: PALO VERDE DRN
50FT E/O WOODRUFF AVE, Los Angeles, CA
Built 1961 Load: 24.3 t ADT: 28,832
KANAN RD
GoodOver: MEDEA CRK
0.4MI N/O US-101 FWY, Los Angeles, CA
Built 1971 Load: 24.3 t ADT: 44,084
AGOURA RD
GoodOver: PRIVATE DRN #571
200FT S/O US-101 FWY, Los Angeles, CA
Built 1971 Load: 24.3 t ADT: 1,224
DRIVER AVE
GoodOver: CHESEBORO CYN CRK
300FT W/O CHESEBORO RD, Los Angeles, CA
Built 1972 Load: 24.3 t ADT: 3,927
WILEY CYN RD
GoodOver: SANTA CLARA RIV SF
0.5MI S/O LYONS AVE, Los Angeles, CA
Built 1971 Load: 24.3 t ADT: 12,463
AGOURA RD
GoodOver: LINDERO CYN CHAN
0.2MI W/O KANAN RD, Los Angeles, CA
Built 1972 Load: 24.3 t ADT: 8,910
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.