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.
Fair-condition bridges (1,249)
ROUTE 2 ANGELS CRE
FairOver: ROUTE 210
07-LA-002-24.43, Los Angeles, CA
Built 1972 Load: 24.3 t ADT: 12,400
E91-SANTA FE OFFRP
FairOver: COMPTON CREEK RR TRACKS
07-LA-091-R10.28-COM, Los Angeles, CA
Built 1974 Load: 24.3 t ADT: 6,200
CONANT ST
FairOver: LOS CERRITOS DRN CH
0.2MI W/O BELLFLOWER BLVD, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 5,100
CLARK AVE
FairOver: BOUTON CRK
0.1MI S/O ATHERTON ST, Los Angeles, CA
Built 1959 Load: 24.3 t ADT: 18,550
GAREY AVE
FairOver: CHINO CRK
300FT N/O SR-71 FWY, Los Angeles, CA
Built 1972 Load: 24.3 t ADT: 21,200
VERMONT AVE
FairOver: DOMINGUEZ CHANNEL
1/4 MI S/O ARTESIA BLVD, Los Angeles, CA
Built 1958 Load: 24.3 t ADT: 38,000
MILLS AVE
FairOver: SORENSON DRN
0.3MI E/O TELEGRAPH RD, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 21,008
FOOTHILL BLVD
FairOver: PACOIMA WASH
0.2 MILE SE MACLAY ST, Los Angeles, CA
Built 1923 Load: 24.3 t ADT: 19,441
FALLBROOK AVE
FairOver: DAYTON CREEK
AT SATICOY ST, Los Angeles, CA
Built 1964 Load: 24.3 t ADT: 37,110
FALLBROOK AVE
FairOver: BELL CREEK
0.3 MI N/O VANOWEN AVE, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 42,146
FOX ST
FairOver: EAST CANYON CHANNEL
BETWN RTE 5 & SHARP AVE, Los Angeles, CA
Built 1967 Load: 24.3 t ADT: 6,176
LAUREL CANYON BLVD
FairOver: BRANFORD STREET CHANNEL
WENTWORTH AVENUE, Los Angeles, CA
Built 1957 Load: 24.3 t ADT: 21,521
PLUMMER ST
FairOver: SANTA SUSANA CREEK
0.3 M W/O SR-27(@FARRALN), Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 19,191
SHERMAN WAY
FairOver: DAYTON CREEK
0.2 MI E/O FALLBROOK AVE, Los Angeles, CA
Built 1963 Load: 24.3 t ADT: 28,824
VICTORY BLVD
FairOver: CALABASAS CREEK
0.4 M W/O SR-27(TOPANGA), Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 32,445
REIS ST S XING
FairOver: SORENSEN DRN
0.1MI W/O MILLS AVE, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 1,010
REIS ST N XING
FairOver: SORENSEN DRN
0.1MI W/O PAINTER AVE, Los Angeles, CA
Built 1960 Load: 24.3 t ADT: 714
GRAMERCY PL
FairOver: DOMINGUEZ CHAN
0.3MI N/O ARTESIA BLVD, Los Angeles, CA
Built 1959 Load: 24.3 t ADT: 4,646
CLEARLAKE DR
FairOver: UNNAMED WASH
0.5MI E/O SAND CYN RD, Los Angeles, CA
Built 1965 Load: 24.3 t ADT: 1,010
EDDINGTON DR
FairOver: PRIVATE DRN #669
0.4MI N/O DEL AMO BLVD, Los Angeles, CA
Built 1966 Load: 24.3 t ADT: 3,030
LA SUBIDA DR
FairOver: HACIENDA CRK
0.1MI W/O HACIENDA BLVD, Los Angeles, CA
Built 1962 Load: 24.3 t ADT: 2,005
CEDARTREE RD
FairOver: LEMORAN AVE STORM DRN
0.1MI W/O PASSONS BLVD, Los Angeles, CA
Built 1967 Load: 24.3 t ADT: 2,499
BROOKPARK RD
FairOver: LEMORAN AVE STORM DRN
0.1MI W/O PASSONS BLVD, Los Angeles, CA
Built 1967 Load: 24.3 t ADT: 408
ROSCOE BLVD
FairOver: PACOIMA WASH
0.5 MI E/O SEPULVEDA BLVD, Los Angeles, CA
Built 1957 Load: 24.3 t ADT: 65,311
LASSEN ST
FairOver: GRANADA CHANNEL
0.1 MI W. HAVENHURST AVE, Los Angeles, CA
Built 1972 Load: 24.3 t ADT: 16,500
STATE ROUTE 91
FairOver: BELLFLOWER BLVD
07-LA-091-R15.61-BFL, Los Angeles, CA
Built 1968 Load: 24.6 t ADT: 242,000
STATE ROUTE 57
FairOver: DIAMOND BAR BLVD
07-LA-057-R1.94-DMBR, Los Angeles, CA
Built 1972 Load: 24.6 t ADT: 198,000
FIFTH ST
FairOver: LITTLE DALTON WASH
0.5MI E/O AZUSA AVE, Los Angeles, CA
Built 1960 Load: 24.6 t ADT: 1,273
CERRITOS AVE
FairOver: LITTLE DALTON WASH
0.4MI S/O FOOTHILL BLVD, Los Angeles, CA
Built 1960 Load: 24.6 t ADT: 2,140
STATE ROUTE 1
FairOver: BALLONA CREEK
07-LA-001-30.36-LA, Los Angeles, CA
Built 1937 Load: 24.9 t ADT: 50,000
RAMP/CONNECTOR 118
FairOver: BROWNS CANYON WASH
07-LA-118-R2.55-LA, Los Angeles, CA
Built 1971 Load: 24.9 t ADT: 8,268
N110-N5 CONNECTOR
FairOver: HILLSIDE
07-LA-110-25.43L-LA, Los Angeles, CA
Built 1931 Load: 24.9 t ADT: 100
OCEAN BLVD
FairOver: RR HRB SC DR LA RV SHLND
0.1MI E/O PICO AVE, Los Angeles, CA
Built 1959 Load: 24.9 t ADT: 39,220
OLD TOPANGA CYN RD
FairOver: TOPANGA CYN CRK
50FT W/O TOPANGA CYN RD, Los Angeles, CA
Built 1926 Load: 24.9 t ADT: 3,900
SIERRA HWY NBND
FairOver: SANTA CLARA RIV
0.3MI S/O SOLEDAD CYN RD, Los Angeles, CA
Built 1968 Load: 24.9 t ADT: 18,044
INTERSTATE 5
FairOver: MARIETTA STREET
07-LA-005-16.29-LA, Los Angeles, CA
Built 1948 Load: 25.3 t ADT: 258,000
ESPERANZA STREET
FairOver: ROUTE 5
07-LA-005-15.33-LA, Los Angeles, CA
Built 1948 Load: 25.3 t ADT: 5,500
US 101 NB
FairOver: I 110 101-110 CONNECTORS
07-LA-101-1.57-LA, Los Angeles, CA
Built 1949 Load: 25.3 t ADT: 187,000
CARSON STREET
FairOver: I-110
07-LA-110-7.02-LA, Los Angeles, CA
Built 1962 Load: 25.3 t ADT: 39,000
INTERSTATE 605
FairOver: ARTESIA BLVD
07-LA-605-R4.77-CRTS, Los Angeles, CA
Built 1966 Load: 25.3 t ADT: 245,000
ROSEMONT AVE
FairOver: ROUTE 210
07-LA-210-R17.72, Los Angeles, CA
Built 1972 Load: 25.3 t ADT: 3,500
AMELIA AVE
FairOver: SAN DIMAS WASH
0.1MI N/O FOOTHILL AVE, Los Angeles, CA
Built 1962 Load: 25.3 t ADT: 7,262
GREENLEAF BLVD
FairOver: COMPTON CRK
0.1MI W/O WILLOWBROOK AVE, Los Angeles, CA
Built 1963 Load: 25.3 t ADT: 8,446
SEVENTH STREET
FairOver: ROUTE 101
07-LA-101-S0.02-LA, Los Angeles, CA
Built 1948 Load: 25.6 t ADT: 50,000
CALIFORNIA AVE
FairOver: I 405 & RAMPS
07-LA-405-5.64-SIGH, Los Angeles, CA
Built 1964 Load: 25.6 t ADT: 3,100
RTE 5/10 SEP
FairOver: I 10 & OFF-RAMP
07-LA-005-18.42-LA, Los Angeles, CA
Built 1959 Load: 25.6 t ADT: 230,520
INTERSTATE 10
FairOver: COVENTRY PLACE
07-LA-010-R5.99-LA, Los Angeles, CA
Built 1964 Load: 25.6 t ADT: 258,000
STATE ROUTE 60
FairOver: STIMSON AVE
07-LA-060-16.30, Los Angeles, CA
Built 1967 Load: 25.6 t ADT: 263,000
AMELIA AVE
FairOver: W210-S57 CONNECTOR RAMP
07-LA-210-R44.72-GDR, Los Angeles, CA
Built 1970 Load: 25.6 t ADT: 3,400
AZUSA LN
FairOver: LITTLE DALTON WASH
0.1MI E/O AZUSA AVE, Los Angeles, CA
Built 1960 Load: 25.6 t ADT: 153
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.