Total bridges
644
Public highway bridges in San Joaquin County
County profile · official public datasets
San Joaquin County, CA
644 public highway bridges tracked in the FHWA National Bridge Inventory: 33.7% rated Good, 57.1% Fair, 9.2% Poor.
- 644
- Public bridges
- 33.7%
- Good condition
- 9.2%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
San Joaquin County posts a higher-than-median Poor-condition share among rated counties in the state across large county bridge inventory.
- 42nd
- of 58 on Poor share
- 9.2%
- Poor-condition share
- 644
- public highway bridges
- 1968
- 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 Joaquin County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, San Joaquin County ranks #42 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.2%). San Joaquin County, California contains 644 public highway bridges. Roughly 33.7% are rated “Good,” 57.1% “Fair,” and 9.2% “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
33.7%
217 of 644 rated 7-9
Fair condition
57.1%
368 of 644 rated 5-6
Poor condition
9.2%
59 of 644 rated 4 or below
In-state Poor-share rank
#42 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 644 NBI-tracked bridges by lowest applicable component rating.
Good 33.7% (217)
Fair 57.1% (368)
Poor 9.2% (59)
San Joaquin County's Poor-condition bridges carry 1,143,289 vehicle crossings a day
That is 9.9% of the county's reported daily bridge traffic on 9.2% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 19,378 crossings a day against 12,721 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 644 of 644 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
74.8% of San Joaquin County's bridges have passed the 50-year mark
482 of the 644 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 33.7% 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 9.9% of the county's Poor-condition bridge traffic
INTERSTATE 5 SB over WEBER PERSHING FREMONT, built 1972, carries 113,000 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 59-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 1,143,289 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When San Joaquin County's bridges were built
644 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1910s 3
1910–1919
3 bridges
- 1920s 31
1920–1929
31 bridges
- 1930s 26
1930–1939
26 bridges
- 1940s 27
1940–1949
27 bridges
- 1950s 60
1950–1959
60 bridges
- 1960s
1960–1969
169 bridges
- 1970s
1970–1979
208 bridges
- 1980s 35
1980–1989
35 bridges
- 1990s 30
1990–1999
30 bridges
- 2000s 23
2000–2009
23 bridges
- 2010s 28
2010–2019
28 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1970s, when 208 of the county's bridges still in the inventory were built, which is 32.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1968) matches the California average (1970).
How San Joaquin County compares with California's closest counties by inventory size
The 5 California counties nearest San Joaquin County in number of bridges, with their condition splits. Its 9.2% Poor share is the 4th-lowest of these 6. Its average build year of 1968 against a peer-group mean of 1970 is in line with the group.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Kern County | 668 | 50.1% | 43.3% | 6.6% | 1972 |
| Alameda County | 658 | 35.3% | 55.2% | 9.6% | 1973 |
| San Joaquin County (this page) | 644 | 33.7% | 57.1% | 9.2% | 1968 |
| Contra Costa County | 618 | 42.6% | 46.9% | 10.5% | 1977 |
| Sonoma County | 609 | 24.1% | 69% | 6.9% | 1967 |
| Tulare County | 589 | 42.4% | 54.2% | 3.4% | 1959 |
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 Joaquin 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 Joaquin County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (644 bridges here).
- Mohave County, AZ · 641 bridges
- Will County, IL · 649 bridges
- Spartanburg County, SC · 638 bridges
- Greenville County, SC · 635 bridges
Similar average build year
Nearest mean year-built outside CA (1968 here).
- Montgomery County, PA · avg 1968 · 828 bridges
- Providence County, RI · avg 1968 · 476 bridges
- Delaware County, PA · avg 1968 · 387 bridges
- Genesee County, MI · avg 1968 · 371 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (644)
INTERSTATE 5
FairOver: CARLTON AVE
10-SJ-005-27.66-STKN, San Joaquin, CA
Built 1970 Load: 24.3 t ADT: 113,000
EIGHT MILE ROAD
FairOver: PIXLEY CREEK
AT WEST LANE., San Joaquin, CA
Built 1963 Load: 24.3 t ADT: 14,064
WEST LANE
FairOver: PIXLEY SLOUGH
0.7 MI N/O EIGHT MI RD, San Joaquin, CA
Built 1962 Load: 24.3 t ADT: 12,583
WEST LANE
FairOver: WOODBRIDGE S MAIN CANAL
0.7 MI S ARMSTRONG RD, San Joaquin, CA
Built 1963 Load: 24.3 t ADT: 13,343
AIRPORT WAY
FairOver: S BR WEBER CREEK
1.2 MI N FRENCH CAMP RD, San Joaquin, CA
Built 1961 Load: 24.3 t ADT: 8,754
JACK TONE ROAD
FairOver: LONE TREE CREEK
1.2 MI N LONE TREE RD, San Joaquin, CA
Built 1962 Load: 24.3 t ADT: 1,761
COLLIER RD
FairOver: DRAIN DITCH
0.3 MI E OF SOWLES RD, San Joaquin, CA
Built 1972 Load: 24.3 t ADT: 1,084
ELLIOTT RD
FairOver: DRY CREEK OVERFLOW
1 MI N OF LIBERTY RD, San Joaquin, CA
Built 1972 Load: 24.3 t ADT: 1,120
ANGIER RD
FairOver: PIXLEY SLOUGH
0.4 MI N LIVE OAK RD, San Joaquin, CA
Built 1970 Load: 24.3 t ADT: 127
FURRY RD
FairOver: PIXLEY SLOUGH
0.7 MI N LIVE OAK RD, San Joaquin, CA
Built 1970 Load: 24.3 t ADT: 220
MICKE GROVE RD
FairOver: PIXLEY SLOUGH
0.5 MI S ARMSTRONG RD, San Joaquin, CA
Built 1970 Load: 24.3 t ADT: 1,079
STAGECOACH ROAD
FairOver: DUCK CREEK
0.1 MI N OF MARIPOSA RD, San Joaquin, CA
Built 1972 Load: 24.3 t ADT: 11,300
SEXTON RD
FairOver: LONE TREE CREEK
1.9 MI N OF S.H. 120, San Joaquin, CA
Built 1963 Load: 24.3 t ADT: 203
ARCH ROAD
FairOver: WEBER CREEK
0.3 MI W OF NEWCASTLE, San Joaquin, CA
Built 1966 Load: 24.3 t ADT: 6,200
PEARSON ROAD
FairOver: PIXLEY CREEK
0.6 MI N EIGHT MILE RD, San Joaquin, CA
Built 1966 Load: 24.3 t ADT: 415
LOWER SACRAMENTO R
FairOver: WINEDRAW SLOUGH
JUST SOUTH EIGHT MILE RD, San Joaquin, CA
Built 1957 Load: 24.3 t ADT: 11,122
CORRAL HOLLOW RD
FairOver: ROUTE 580
10-SJ-580-8.15, San Joaquin, CA
Built 1966 Load: 24.6 t ADT: 2,500
INTERSTATE 5
FairOver: BUENA VISTA UC
10-SJ-005-27.28-STKN, San Joaquin, CA
Built 1970 Load: 24.6 t ADT: 113,000
LOWER SACRAMENTO R
FairOver: MOKELUMNE RIVER OVERFLOW
0.7 MI N TURNER RD, San Joaquin, CA
Built 1969 Load: 24.6 t ADT: 9,943
CAROLYN WESTON BLV
FairOver: FRENCH CAMP SLOUGH
0.7 MI WEST OF MANTHEY RD, San Joaquin, CA
Built 1997 Load: 24.6 t ADT: 16,700
BLEWETT ROAD
FairOver: CALIFORNIA AQUEDUCT
1.3 MI W KOSTER RD, San Joaquin, CA
Built 1967 Load: 24.9 t ADT: 200
STATE ROUTE 4
FairOver: PRIVATE ACCESS
10-SJ-004-14.22, San Joaquin, CA
Built 1933 Load: 25.3 t ADT: 19,950
INTERSTATE 205
FairOver: SUGAR SPUR RR
10-SJ-205-R7.85-TRA, San Joaquin, CA
Built 1970 Load: 25.3 t ADT: 47,500
FRAIZER ROAD
FairOver: MOSHER CREEK
1.5 MI W OF CLEMENTS RD, San Joaquin, CA
Built 1956 Load: 25.3 t ADT: 221
MCKINLEY ROAD
FairOver: N BR FRENCH CAMP SLOUGH
1.0 MI N FRENCH CAMP/RD, San Joaquin, CA
Built 1923 Load: 25.3 t ADT: 4,300
SERVICE ROAD
FairOver: STATE ROUTE 132
10-SJ-132-0.98, San Joaquin, CA
Built 1966 Load: 25.6 t ADT: 25
STATE ROUTE 99 SB
FairOver: LONE TREE SLOUGH
10-SJ-099-11.80, San Joaquin, CA
Built 1955 Load: 25.9 t ADT: 85,000
MOUNTAIN HOUSE RD
FairOver: CALIFORNIA AQUEDUCT
0.1 MI S SCHULTE RD, San Joaquin, CA
Built 1967 Load: 25.9 t ADT: 4,403
LOWER SAC RD
FairOver: PIXLEY SLOUGH
N OF 8 MILE RD, San Joaquin, CA
Built 1926 Load: 26.2 t ADT: 11,122
STATE ROUTE 88
FairOver: CALAVERAS RIVER
10-SJ-088-6.10, San Joaquin, CA
Built 1947 Load: 26.6 t ADT: 6,700
TRACY BLVD
FairOver: CALIFORNIA AQUEDUCT
2.5 MI S OF UNNE RD, San Joaquin, CA
Built 1967 Load: 26.6 t ADT: 1,589
CHRISMAN RD
FairOver: INTERSTATE 580
10-SJ-580-4.02, San Joaquin, CA
Built 1967 Load: 26.9 t ADT: 2,500
BRENNAN RD
FairOver: LONE TREE CREEK
0.1 MI S OF LONE TREE RD, San Joaquin, CA
Built 1926 Load: 26.9 t ADT: 289
STATE ROUTE 26
FairOver: DUCK CREEK
10-SJ-026-16.87, San Joaquin, CA
Built 1984 Load: 27.2 t ADT: 5,200
STATE ROUTE 4
FairOver: SAN JOAQUIN RIVER
10-SJ-004-14.15, San Joaquin, CA
Built 1933 Load: 27.2 t ADT: 19,950
STATE ROUTE 88
FairOver: BEAR CREEK
10-SJ-088-8.91, San Joaquin, CA
Built 1964 Load: 27.2 t ADT: 8,850
STATE ROUTE 12
FairOver: STATE ROUTE 99
10-SJ-012-18.08-LOD, San Joaquin, CA
Built 1963 Load: 27.2 t ADT: 11,800
STATE ROUTE 4
FairOver: MADISON STREET
10-SJ-004-R16.47-STKN, San Joaquin, CA
Built 1972 Load: 27.2 t ADT: 15,500
STATE ROUTE 4
FairOver: MADISON STREET
10-SJ-004-R16.47-STKN, San Joaquin, CA
Built 1972 Load: 27.2 t ADT: 15,500
MARLETTE ROAD
FairOver: PIXLEY SLOUGH
S OF 8 MI RD E OF RR TRK, San Joaquin, CA
Built 2007 Load: 27.5 t ADT: 2,000
MCKINLEY RD
FairOver: FRENCH CAMP SLOUGH
0.3 MI NE FRENCH CAMP RD, San Joaquin, CA
Built 1970 Load: 27.9 t ADT: 3,303
ESCALON-BELLOTA RD
FairOver: LITTLEJOHNS CREEK
0.3 MI SOUTH OF S.H. 4, San Joaquin, CA
Built 1948 Load: 27.9 t ADT: 3,681
WEST LANE
FairOver: MOSHER SLOUGH
0.5 MI N HAMMER LANE, San Joaquin, CA
Built 1966 Load: 27.9 t ADT: 27,300
CHRISMAN ROAD
FairOver: STATE ROUTE 132
10-SJ-132-0.24, San Joaquin, CA
Built 1966 Load: 28.2 t ADT: 1,500
N5-MARCH LN OFFRMP
FairOver: EBMUD AQUEDUCT
10-SJ-005-29.83, San Joaquin, CA
Built 1970 Load: 28.2 t ADT: 10,800
CHRISMAN RD
FairOver: CALIFORNIA AQUEDUCT
0.5 MI N OF S.H. 132, San Joaquin, CA
Built 1965 Load: 28.5 t ADT: 1,000
INTERSTATE 5 NB
FairOver: PARADISE CUT
10-SJ-005-R13.01, San Joaquin, CA
Built 1969 Load: 28.8 t ADT: 71,500
W120-S5 CONNECTOR
FairOver: SAN JOAQUIN RIVER 03
10-SJ-005-R14.16, San Joaquin, CA
Built 1947 Load: 29.2 t ADT: 37,500
INTERSTATE 205
FairOver: SUGAR SPUR RR
10-SJ-205-R7.85-TRA, San Joaquin, CA
Built 1970 Load: 29.2 t ADT: 47,500
5N -132E CONNECTOR
FairOver: DELTA-MENDOTA CANAL
10-SJ-005-3.27, San Joaquin, CA
Built 1971 Load: 29.5 t ADT: 5,000
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.