Total bridges
386
Public highway bridges in Stanislaus County
County profile · official public datasets
Stanislaus County, CA
386 public highway bridges tracked in the FHWA National Bridge Inventory: 30.8% rated Good, 55.7% Fair, 13.5% Poor.
- 386
- Public bridges
- 30.8%
- Good condition
- 13.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Stanislaus County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 54th
- of 58 on Poor share
- 13.5%
- Poor-condition share
- 386
- public highway bridges
- 1956
- 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.
Stanislaus County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Stanislaus County ranks #54 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 13.5%). Stanislaus County, California contains 386 public highway bridges. Roughly 30.8% are rated “Good,” 55.7% “Fair,” and 13.5% “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
30.8%
119 of 386 rated 7-9
Fair condition
55.7%
215 of 386 rated 5-6
Poor condition
13.5%
52 of 386 rated 4 or below
In-state Poor-share rank
#54 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 386 NBI-tracked bridges by lowest applicable component rating.
Good 30.8% (119)
Fair 55.7% (215)
Poor 13.5% (52)
Stanislaus County's Poor-condition bridges carry 530,953 vehicle crossings a day
That is 14% of the county's reported daily bridge traffic on 13.5% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 10,211 crossings a day against 12,914 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 386 of 386 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
80.1% of Stanislaus County's bridges have passed the 50-year mark
309 of the 386 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 30.8% 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 13.5% of the county's Poor-condition bridge traffic
BRIGGSMORE ROAD over UP RR & BRINK AVENUE, built 1976, carries 71,797 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 52-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 530,953 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Stanislaus County's bridges were built
386 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1910s 27
1910–1919
27 bridges
- 1920s
1920–1929
82 bridges
- 1930s 25
1930–1939
25 bridges
- 1940s 22
1940–1949
22 bridges
- 1950s 24
1950–1959
24 bridges
- 1960s
1960–1969
103 bridges
- 1970s 35
1970–1979
35 bridges
- 1980s 17
1980–1989
17 bridges
- 1990s 17
1990–1999
17 bridges
- 2000s 13
2000–2009
13 bridges
- 2010s 9
2010–2019
9 bridges
- 2020s 11
2020–2029
11 bridges
What this shows Construction peaked in the 1960s, when 103 of the county's bridges still in the inventory were built, which is 26.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1956, 14 years older than the California average of 1970.
How Stanislaus County compares with California's closest counties by inventory size
The 5 California counties nearest Stanislaus County in number of bridges, with their condition splits. Its 13.5% Poor share is the 6th-lowest of these 6. Its average build year of 1956 against a peer-group mean of 1970 is 14 years older.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| San Luis Obispo County | 401 | 47.6% | 46.6% | 5.7% | 1970 |
| Humboldt County | 396 | 38.9% | 54.3% | 6.8% | 1968 |
| Stanislaus County (this page) | 386 | 30.8% | 55.7% | 13.5% | 1956 |
| Monterey County | 377 | 56.8% | 35.5% | 7.7% | 1970 |
| Solano County | 373 | 44.8% | 47.5% | 7.8% | 1975 |
| San Mateo County | 361 | 26% | 64% | 10% | 1967 |
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 Stanislaus 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 Stanislaus County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (386 bridges here).
- Calhoun County, AL · 386 bridges
- Gibson County, TN · 386 bridges
- Alfalfa County, OK · 387 bridges
- Delaware County, PA · 387 bridges
Similar average build year
Nearest mean year-built outside CA (1956 here).
- Philadelphia County, PA · avg 1956 · 585 bridges
- Cochise County, AZ · avg 1956 · 501 bridges
- Hampden County, MA · avg 1956 · 428 bridges
- Washington County, MD · avg 1956 · 300 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (52)
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.