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.

Total bridges

3,547

Public highway bridges in Los Angeles County

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

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).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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.

Bridge inventory size and condition shares for Los Angeles County and the 5 California counties closest to it in inventory size
County Bridges Poor
Los Angeles County (this page) 3,547 3.4%
San Diego County 1,632 3.1%
San Bernardino County 1,422 6%
Orange County 1,164 3%
Riverside County 1,117 2.4%
Santa Clara County 964 5.6%

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).

Similar average build year

Nearest mean year-built outside CA (1967 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 3,547 Good 2,178 Fair 1,249 Poor 120

Good-condition bridges (2,178)

ROWLAND AVE

Good

Over: CHARTER OAK WASH

0.1MI W/O BARRANCA AVE, Los Angeles, CA

Built 1965 Load: 24.3 t ADT: 15,913

GALE AVE

Good

Over: PRIVATE DRN #507

0.3MI N/O SR-60 FWY, Los Angeles, CA

Built 1965 Load: 24.3 t ADT: 21,138

WHITE AVE

Good

Over: THOMPSON CRK

0.8MI N/O I-10 FWY, Los Angeles, CA

Built 1958 Load: 24.3 t ADT: 17,000

WALNUT ST

Good

Over: LIVE OAK WASH

0.1MI W/O ARROW HWY, Los Angeles, CA

Built 1950 Load: 24.3 t ADT: 667

AMALFI DR

Good

Over: SANTA MONICA CYN CHANNEL

50 W/O CHANNEL ROAD, Los Angeles, CA

Built 1952 Load: 24.3 t ADT: 1,810

SHORT ST

Good

Over: SANTA MONICA CYN CHANNEL

50 S/O WEST CHANNEL RD, Los Angeles, CA

Built 1940 Load: 24.3 t ADT: 135

ETON AVE

Good

Over: SANTA SUSANA CREEK

0.05 M N/O PARTHENIA ST, Los Angeles, CA

Built 1966 Load: 24.3 t ADT: 1,650

ARIZONA AVE

Good

Over: FOX HILLS WASH

20FT S/O CENTINELA AVE, Los Angeles, CA

Built 1959 Load: 24.3 t ADT: 800

BURBANK BLVD

Good

Over: CALABASAS CREEK

0.45 M W/O FALLBROOK AVE, Los Angeles, CA

Built 1968 Load: 24.3 t ADT: 11,000

CANZONET ST

Good

Over: CALABASAS CREEK

0.45 M E VALLEY CIRCLE BL, Los Angeles, CA

Built 1968 Load: 24.3 t ADT: 1,100

CHAUTAUQUA BLVD

Good

Over: HILLSIDE

0.05 MI EAST OF PCH, Los Angeles, CA

Built 1954 Load: 24.3 t ADT: 15,161

EAST CHANNEL RD

Good

Over: SANTA MONICA CYN CHANNEL

0.1 MI NORTH ESPARTA WAY, Los Angeles, CA

Built 1962 Load: 24.3 t ADT: 125

ENTRADA DR

Good

Over: SANTA MONICA CYN CHANNEL

W CHNNL RD & 0.4 M NE PCH, Los Angeles, CA

Built 1952 Load: 24.3 t ADT: 150

LASSEN ST

Good

Over: ALISO CREEK

0.1MI W/O RESEDA BLVD, Los Angeles, CA

Built 1966 Load: 24.3 t ADT: 26,656

VENTURA BLVD

Good

Over: DRY CANYON CREEK

0.3 M E VALLEY CIRCLE BLD, Los Angeles, CA

Built 1958 Load: 24.3 t ADT: 15,696

MARIANO ST

Good

Over: CALABASAS CREEK

0.15 M W/O WOODLAKE AVE, Los Angeles, CA

Built 1968 Load: 24.3 t ADT: 1,200

NORDOFF ST

Good

Over: ALISO CREEK

0.15MI W/O WILBUR AVE, Los Angeles, CA

Built 1969 Load: 24.3 t ADT: 32,970

OWENSMOUTH AVE

Good

Over: SANTA SUSANA CREEK

0.1 MI S NORDOFF ST, Los Angeles, CA

Built 1966 Load: 24.3 t ADT: 10,800

OXNARD STREET

Good

Over: CALABASAS CREEK

0.4M E FAIRBROOK AVE, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 8,277

PARTHENIA ST

Good

Over: SANTA SUSANA CREEK

0.2 MI E/O CANOGA AVE, Los Angeles, CA

Built 1966 Load: 24.3 t ADT: 8,727

PLUMMER ST

Good

Over: ALISO CREEK

230FT W/O WILBUR AVE, Los Angeles, CA

Built 1967 Load: 24.3 t ADT: 24,204

RESEDA BLVD

Good

Over: ALISO CREEK

175FT N/O LASSEN ST, Los Angeles, CA

Built 1950 Load: 24.3 t ADT: 41,691

ROSCOE BLVD

Good

Over: BROWNS CANYON WASH

350FT E/O DE SOTO AVE, Los Angeles, CA

Built 1971 Load: 24.3 t ADT: 32,500

SATICOY ST

Good

Over: BROWNS CANYON WASH

0.3 MI E/O DE SOTO AVE, Los Angeles, CA

Built 1971 Load: 24.3 t ADT: 25,458

SHOUP AVE

Good

Over: CALABASAS CREEK

0.2 S/O VICTORY BLVD, Los Angeles, CA

Built 1964 Load: 24.3 t ADT: 26,096

SHOUP AVE

Good

Over: SANTA SUSANA CREEK

0.64 KM S/O LASSEN ST, Los Angeles, CA

Built 1967 Load: 24.3 t ADT: 463

STRATHERN ST

Good

Over: ALISO CREEK

175FT E/O WILBUR AVE, Los Angeles, CA

Built 1952 Load: 24.3 t ADT: 3,665

VALLEY CIRCLE BLVD

Good

Over: CALABASAS CREEK

0.3 MI N/O US 101, Los Angeles, CA

Built 1962 Load: 24.3 t ADT: 17,440

VALLEY CIRCLE BLVD

Good

Over: BELL CREEK

0.2 M N/O VANOWEN ST, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 18,901

VANOWEN ST

Good

Over: CALABASAS CREEK

0.1 E/O TOPANGA CYN BLVD, Los Angeles, CA

Built 1964 Load: 24.3 t ADT: 23,600

WILBUR AVE

Good

Over: ALISO CREEK

350FT N/O PLUMMER ST, Los Angeles, CA

Built 1969 Load: 24.3 t ADT: 14,913

WOODLAKE AVE

Good

Over: CALABASAS CREEK

0.1 S/O BURBANK BLVD, Los Angeles, CA

Built 1968 Load: 24.3 t ADT: 5,000

YOLANDA AVE

Good

Over: ALISO CREEK

0.25MI N/O PLUMMER ST, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 2,500

GUNN AVE

Good

Over: SORENSEN DRN

0.3MI W/O MULBERRY DRIVE, Los Angeles, CA

Built 1960 Load: 24.3 t ADT: 8,466

PAINTER AVE

Good

Over: SORENSEN DRN

0.5MI N/O TELEGRAPH RD, Los Angeles, CA

Built 1960 Load: 24.3 t ADT: 10,042

PARK SORRENTO

Good

Over: MC COY CYN CRK

0.1MI E/O PK GRANADA, Los Angeles, CA

Built 1968 Load: 24.3 t ADT: 3,978

DON JULIAN RD

Good

Over: STORM DRN BOND ISSUE 528

0.2MI W/O BASETDALE AVE, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 7,312

PARK CAPRI

Good

Over: MCCOY CYN CRK

300FT S/O PK GRANADA, Los Angeles, CA

Built 1967 Load: 24.3 t ADT: 6,180

BLOOMFIELD AVE

Good

Over: STORM DRN #21

0.3MI N/O DEL AMO BLVD, Los Angeles, CA

Built 1962 Load: 24.3 t ADT: 21,640

MULBERRY DR E/XING

Good

Over: LEFFINGWELL CRK

0.2MI E/O LA MIRADA BLVD, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 14,178

GOLD RUN DR

Good

Over: BREA CYN CHAN

0.4MI S/O DIAMOND BAR BLV, Los Angeles, CA

Built 1966 Load: 24.3 t ADT: 12,463

COLD SPRINGS LN

Good

Over: BREA CYN CHAN

0.8MI S/O PATHFINDER RD, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 2,958

FOUNTAIN SPRINGS R

Good

Over: BREA CYN CHAN

0.5MI S/O PATHFINDER RD, Los Angeles, CA

Built 1963 Load: 24.3 t ADT: 5,445

GALWAY AVE

Good

Over: PRIVATE DRN #669

0.3MI E/O AVALON BLVD, Los Angeles, CA

Built 1966 Load: 24.3 t ADT: 4,040

ASHBRIDGE DR

Good

Over: PRIVATE DRN #553

0.5MI S/O SEPULVEDA BLVD, Los Angeles, CA

Built 1967 Load: 24.3 t ADT: 1,657

THREE PALMS ST

Good

Over: HACIENDA CRK

0.2MI W/O HACIENDA BLVD, Los Angeles, CA

Built 1968 Load: 24.3 t ADT: 29,157

GRANDIFLORAS RD

Good

Over: PRIVATE DRN #771

0.8MI N/O SR-14 FWY, Los Angeles, CA

Built 1970 Load: 24.3 t ADT: 2,020

BEGONIAS LN

Good

Over: PRIVATE DRN #771

0.3MI N/O SR-14 FWY, Los Angeles, CA

Built 1970 Load: 24.3 t ADT: 5,665

LIBERTY CYN RD

Good

Over: PRIVATE DRN #571

0.2MI S/O US-101 FWY, Los Angeles, CA

Built 1971 Load: 24.3 t ADT: 4,896

FOXFIELD DR

Good

Over: PRIVATE DRN #792

30FT S/O LINDERO CYN RD, Los Angeles, CA

Built 1969 Load: 24.3 t ADT: 690

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
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.