County profile · official public datasets

Yuba County, CA

127 public highway bridges tracked in the FHWA National Bridge Inventory: 37.8% rated Good, 55.9% Fair, 6.3% Poor.

127
Public bridges: 37.8%
Good condition: 6.3%
Poor condition

The verdict

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

Yuba County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 45%
lowest Poor share in state: 6.3%
Poor-condition share: 127
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.

Yuba County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Yuba County ranks #26 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.3%). Yuba County, California contains 127 public highway bridges. Roughly 37.8% are rated “Good,” 55.9% “Fair,” and 6.3% “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

127

Public highway bridges in Yuba County

Good condition

37.8%

48 of 127 rated 7-9

Fair condition

55.9%

71 of 127 rated 5-6

Poor condition

6.3%

8 of 127 rated 4 or below

In-state Poor-share rank

#26 of 58

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

Condition distribution

Share of 127 NBI-tracked bridges by lowest applicable component rating.

Good

37.8% (48)

Fair

55.9% (71)

Poor

6.3% (8)

Yuba County's Poor-condition bridges carry 21,560 vehicle crossings a day

That is 3.8% of the county's reported daily bridge traffic on 6.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,695 crossings a day against 6,925 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 127 of 127 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

59.8% of Yuba County's bridges have passed the 50-year mark

76 of the 127 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 37.8% 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 53.9% of the county's Poor-condition bridge traffic

SIMPSON LN over YUBA RIVER, built 1957, carries 11,630 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 8-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 21,560 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1900s

3
1910s

4
1920s

17
1930s

6
1940s

7
1950s

14
1960s

15
1970s

13
1980s

11
1990s

6
2000s

5
2010s

16
2020s

9

What this shows Construction peaked in the 1920s, when 17 of the county's bridges still in the inventory were built, which is 13.4% of those with a recorded year. That cohort is now 95 to 104 years old in the 2024 inventory. Its average build year (1967) matches the California average (1970).

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

The 5 California counties nearest Yuba County in number of bridges, with their condition splits. Its 6.3% Poor share is the 1st-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1969 is in line with the group.

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

Bridge inventory size and condition shares for Yuba County and the 5 California counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
San Francisco County	143	34.3%	51%	14.7%	1969
Nevada County	135	45.2%	40.7%	14.1%	1972
Lake County	129	30.2%	62%	7.8%	1970
Yuba County (this page)	127	37.8%	55.9%	6.3%	1967
Tuolumne County	125	36%	56.8%	7.2%	1964
Sutter County	121	33.9%	52.9%	13.2%	1968

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

Similar inventory size

Nearest county inventories outside CA (127 bridges here).

Jefferson County, ID · 127 bridges
Harrison County, IN · 127 bridges
Vermillion County, IN · 127 bridges
Knox County, KY · 127 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.

All 127 Good 48 Fair 71 Poor 8

Good-condition bridges (48)

Sort:

Yuba County Bridge Snapshot

Condition distribution

Yuba County's Poor-condition bridges carry 21,560 vehicle crossings a day

59.8% of Yuba County's bridges have passed the 50-year mark

One structure carries 53.9% of the county's Poor-condition bridge traffic

How Yuba 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 (48)

ROAD 20N35

ALLEGHANY RD

RANCHO RD

WOODRUFF LN

STATE ROUTE 65

MARYSVILLE RD

STATE ROUTE 70

FOURTEENTH ST

STATE ROUTE 65

OLIVEHURST AVE

STATE ROUTE 70

STATE ROUTE 70 EB

STATE ROUTE 70

STATE ROUTE 65

STATE ROUTE 20

STATE ROUTE 20

STATE ROUTE 70

JASPER LANE

PLUMAS ARBOGA RD

COUNTY ROAD 10

VIRGINIA RD

SMITH RD

FORTY MILE RD

HONCUT RD

LA PORTE RD

TIMBUCTOO LANE

NEW YORK HOUSE RD

IOWA CITY ROAD

RICES CROSSING RD

MCGOWAN ROAD

GAVIN MANDRY DRIVE

STATE ROUTE 70

STATE ROUTE 65 SB

STATE ROUTE 65 NB

STATE ROUTE 65 SB

NORTH EARL ROAD

FORTY MILE ROAD

J ST. (S BEALE RD)

STATE ROUTE 70

FEATHER RIVER BLVD

BROADWAY

OAKLEY LN

GAVIN MANDRY DRIVE

RAMIREZ RD

MARYSVILLE RD

GAVIN MANDRY DRIVE

GAVIN MANDRY DRIVE

GAVIN MANDRY DRIVE

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