County profile · official public datasets

San Bernardino County, CA

1,422 public highway bridges tracked in the FHWA National Bridge Inventory: 41.9% rated Good, 52.1% Fair, 6% Poor.

1,422
Public bridges: 41.9%
Good condition: 6%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

San Bernardino County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 38%
lowest Poor share in state: 6%
Poor-condition share: 1,422
public highway bridges: 1975
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.

San Bernardino County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, San Bernardino County ranks #22 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6%). San Bernardino County, California contains 1,422 public highway bridges. Roughly 41.9% are rated “Good,” 52.1% “Fair,” and 6% “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

1,422

Public highway bridges in San Bernardino County

Good condition

41.9%

596 of 1,422 rated 7-9

Fair condition

52.1%

741 of 1,422 rated 5-6

Poor condition

85 of 1,422 rated 4 or below

In-state Poor-share rank

#22 of 58

Among California counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 1,422 NBI-tracked bridges by lowest applicable component rating.

Good

41.9% (596)

Fair

52.1% (741)

Poor

6% (85)

San Bernardino County's Poor-condition bridges carry 714,106 vehicle crossings a day

That is 1.8% of the county's reported daily bridge traffic on 6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 8,401 crossings a day against 28,402 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 1,422 of 1,422 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

58.7% of San Bernardino County's bridges have passed the 50-year mark

835 of the 1,422 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 41.9% 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 5.6% of the county's Poor-condition bridge traffic

CENTRAL AVE over UP RR AMTRAK METROLINK, built 1967, carries 39,900 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 85-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 714,106 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1910s

6
1920s

13
1930s

106
1940s

29
1950s

100
1960s

385
1970s

284
1980s

114
1990s

131
2000s

144
2010s

96
2020s

13

What this shows Construction peaked in the 1960s, when 385 of the county's bridges still in the inventory were built, which is 27.1% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1975, 5 years newer than the California average of 1970.

How San Bernardino County compares with California's closest counties by inventory size

The 5 California counties nearest San Bernardino County in number of bridges, with their condition splits. Its 6% Poor share is the 6th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1975 is in line with the group.

Showing the 5 closest of 57 California counties eligible for comparison.

Bridge inventory size and condition shares for San Bernardino County and the 5 California counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
San Diego County	1,632	52.8%	44.2%	3.1%	1977
San Bernardino County (this page)	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
Fresno County	916	38.9%	57.3%	3.8%	1969

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 San Bernardino 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 San Bernardino County, both outside California so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside CA (1,422 bridges here).

Sedgwick County, KS · 1,333 bridges
Travis County, TX · 1,544 bridges
Allegheny County, PA · 1,294 bridges
King County, WA · 1,238 bridges

Similar average build year

Nearest mean year-built outside CA (1975 here).

Lane County, OR · avg 1975 · 1,010 bridges
Fulton County, GA · avg 1975 · 775 bridges
Westmoreland County, PA · avg 1975 · 620 bridges
Monroe County, NY · avg 1975 · 615 bridges

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

All 1,422 Good 596 Fair 741 Poor 85

Good-condition bridges (596)

Sort:

San Bernardino County Bridge Snapshot

Condition distribution

San Bernardino County's Poor-condition bridges carry 714,106 vehicle crossings a day

58.7% of San Bernardino County's bridges have passed the 50-year mark

One structure carries 5.6% of the county's Poor-condition bridge traffic

How San Bernardino County compares with California's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (596)

STATE HIGHWAY 138

NAT TRAILS HWY

FORT IRWIN ROAD

FORT IRWIN RD

INTERSTATE 15 SB

INTERSTATE 40 EB

STATE ROUTE 58 EB

PARK MOABI RD

VALLEY OF THE FALL

W10-S15 CONN RAMP

STATE ROUTE 259 NB

STATE ROUTE 18

MISSION BLVD

INTERSTATE 15 SB

INTERSTATE 15 NB

INTERSTATE 10 EB

INTERSTATE 40

YATES WELL ROAD

INTERSTATE 15 NB

I-10 EB OFF RAMP

HIGHLAND AVE

I-15 NB ON RAMP

INTERSTATE 15 NB

ROUTE 40 E BOUND

INTERSTATE 40 WB

INTERSTATE 40 EB

STATE ROUTE 18

HOLT AVE

INTERSTATE 40 WB

INTERSTATE 40 EB

INTERSTATE 15

STATE ROUTE 210 EB

INTERSTATE 15 SB

INTERSTATE 15 SB

INTERSTATE 15 SB

INTERSTATE 15 NB

INTERSTATE 10

INTERSTATE 15 SB

CIMA ROAD

INTERSTATE 10

INTERSTATE 10

INTERSTATE 10 WB

INTERSTATE 10 EB

INTERSTATE 10

INTERSTATE 10

INTERSTATE 10

INTERSTATE 10

N215-E10 CONNECTOR

INTERSTATE 215 NB

N15 CONN FROM SR18

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