Total bridges
377
Public highway bridges in Monterey County
County profile · official public datasets
Monterey County, CA
377 public highway bridges tracked in the FHWA National Bridge Inventory: 56.8% rated Good, 35.5% Fair, 7.7% Poor.
- 377
- Public bridges
- 56.8%
- Good condition
- 7.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Monterey County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 35th
- of 58 on Poor share
- 7.7%
- Poor-condition share
- 377
- public highway bridges
- 1970
- 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.
Monterey County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Monterey County ranks #35 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.7%). Monterey County, California contains 377 public highway bridges. Roughly 56.8% are rated “Good,” 35.5% “Fair,” and 7.7% “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
56.8%
214 of 377 rated 7-9
Fair condition
35.5%
134 of 377 rated 5-6
Poor condition
7.7%
29 of 377 rated 4 or below
In-state Poor-share rank
#35 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 377 NBI-tracked bridges by lowest applicable component rating.
Good 56.8% (214)
Fair 35.5% (134)
Poor 7.7% (29)
Monterey County's Poor-condition bridges carry 93,587 vehicle crossings a day
That is 2.7% of the county's reported daily bridge traffic on 7.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,227 crossings a day against 11,871 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 377 of 377 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
68.4% of Monterey County's bridges have passed the 50-year mark
258 of the 377 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 56.8% 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 30.3% of the county's Poor-condition bridge traffic
SANBORN RD over UP RR & AMTRAK, built 1948, carries 28,392 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 29-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 93,587 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Monterey County's bridges were built
377 bridges with a recorded construction year, grouped by decade
- 1910s 4
1910–1919
4 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 18
1930–1939
18 bridges
- 1940s 29
1940–1949
29 bridges
- 1950s 48
1950–1959
48 bridges
- 1960s
1960–1969
127 bridges
- 1970s
1970–1979
56 bridges
- 1980s 27
1980–1989
27 bridges
- 1990s 22
1990–1999
22 bridges
- 2000s 21
2000–2009
21 bridges
- 2010s 23
2010–2019
23 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1960s, when 127 of the county's bridges still in the inventory were built, which is 33.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1970) matches the California average (1970).
How Monterey County compares with California's closest counties by inventory size
The 5 California counties nearest Monterey County in number of bridges, with their condition splits. Its 7.7% Poor share is the 3rd-lowest of these 6. Its average build year of 1970 against a peer-group mean of 1967 is in line with the group.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Humboldt County | 396 | 38.9% | 54.3% | 6.8% | 1968 |
| Stanislaus County | 386 | 30.8% | 55.7% | 13.5% | 1956 |
| Monterey County (this page) | 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 |
| Mendocino County | 357 | 34.7% | 57.7% | 7.6% | 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 Monterey 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 Monterey County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (377 bridges here).
- Ogle County, IL · 377 bridges
- Cass County, MO · 377 bridges
- Butler County, OH · 377 bridges
- Butler County, PA · 378 bridges
Similar average build year
Nearest mean year-built outside CA (1970 here).
- Hamilton County, OH · avg 1970 · 783 bridges
- Yavapai County, AZ · avg 1970 · 543 bridges
- Garfield County, OK · avg 1970 · 504 bridges
- Somerset County, NJ · avg 1970 · 397 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (134)
W. GARZAS ROAD
FairOver: LAS GAZAS CREEK
0.1 MI NW BORONDA ROAD, Monterey, CA
Built 1980 Load: 33.4 t ADT: 1,200
LONOAK ROAD
FairOver: SAN LORENZO CREEK
SAN BENITO COUNTY LINE, Monterey, CA
Built 1950 Load: 33.4 t ADT: 2,300
US HIGHWAY 101 NB
FairOver: BROADWAY
05-MON-101-R41.19R, Monterey, CA
Built 1968 Load: 33.7 t ADT: 15,900
1ST ST (CO RD G15)
FairOver: US HIGHWAY 101
05-MON-101-R39.77, Monterey, CA
Built 1968 Load: 34.0 t ADT: 5,500
A ST
FairOver: US HIGHWAY 101
05-MON-101-R0.84, Monterey, CA
Built 1965 Load: 34.3 t ADT: 100
US HIGHWAY 101 NB
FairOver: BRADLEY RD
05-MON-101-R7.94, Monterey, CA
Built 1965 Load: 34.3 t ADT: 8,100
STATE ROUTE 1 SB
FairOver: LAKE DRIVE
05-MON-001-R85.51, Monterey, CA
Built 1976 Load: 34.3 t ADT: 23,000
CROSS COUNTRY ROAD
FairOver: VINEYARD CANYON CREEK
0.1 MI N VINEYARD CNYN RD, Monterey, CA
Built 1940 Load: 34.3 t ADT: 210
NACIMIENTO ROAD
FairOver: SAN ANTONIO RIVER
SW GRAVEL PIT RES-S6B/16B, Monterey, CA
Built 1940 Load: 35.0 t ADT: 50
SOUTH FIRST STREET
FairOver: SAN LORENZO CREEK
0.15 MI NW LONOAK RD, Monterey, CA
Built 2009 Load: 35.3 t ADT: 6,518
PRKFLD-COALINGA RD
FairOver: LITTLE CHOLAME CREEK
5.0 MI N VINYARD CYN RD, Monterey, CA
Built 1972 Load: 36.6 t ADT: 170
SAN ANTONIO ROAD
FairOver: HARRIS CREEK
0.32 MI N INTERLAKE RD, Monterey, CA
Built 1969 Load: 37.3 t ADT: 350
NATIVIDAD ROAD
FairOver: GABILAN CREEK
0.9 MI S OLD STAGE ROAD, Monterey, CA
Built 1971 Load: 37.3 t ADT: 4,200
STATE ROUTE 1
FairOver: BIXBY CREEK
05-MON-001-59.37, Monterey, CA
Built 1932 Load: 37.6 t ADT: 4,300
US HIGHWAY 101 NB
FairOver: LOCKWOOD SAN LUCAS ROAD
05-MON-101-R30.65, Monterey, CA
Built 1971 Load: 37.6 t ADT: 7,450
STATE ROUTE 156 EB
FairOver: UP RR & AMTRAK
05-MON-156-R1.59, Monterey, CA
Built 1966 Load: 38.2 t ADT: 16,116
US HIGHWAY 101 SB
FairOver: SALINAS RIVER
05-MON-101-R30.80, Monterey, CA
Built 1971 Load: 38.2 t ADT: 7,450
US HIGHWAY 101 NB
FairOver: SALINAS RIVER
05-MON-101-R30.80, Monterey, CA
Built 1971 Load: 38.2 t ADT: 7,450
GRIFFIN ROAD
FairOver: N FK LEWIS CREEK
0.1 MI NE OF SH 198, Monterey, CA
Built 1950 Load: 38.6 t ADT: 50
S146-S101-N146 CON
FairOver: US HWY 101
05-MON-146-1.49, Monterey, CA
Built 1960 Load: 38.9 t ADT: 5,000
HARE CANYON ROAD
FairOver: BIG SANDY CREEK
AT INDIAN VALLEY RD, Monterey, CA
Built 1964 Load: 41.8 t ADT: 60
DAVIS RD
FairOver: DAVIS ROAD OH
JUST N SH 183, Monterey, CA
Built 1983 Load: 42.1 t ADT: 36,700
HEBERT RD
FairOver: GABILAN CREEK
0.4 MI E SAN JUAN GRADE R, Monterey, CA
Built 1975 Load: 42.8 t ADT: 5,900
ELM AVE
FairOver: US HIGHWAY 101
05-MON-101-53.11-GNFD, Monterey, CA
Built 1961 Load: 44.1 t ADT: 3,700
CARMEL VALLEY RD
FairOver: TULARCITOS CREEK
23.9 MI NW ARROYO SECO RD, Monterey, CA
Built 1976 Load: 44.4 t ADT: 930
US HIGHWAY 101 SB
FairOver: UP RR AMTRAK FRONT ST
05-MON-101-62.70, Monterey, CA
Built 1960 Load: 45.0 t ADT: 18,660
PALISADES ROAD
FairOver: DRAINAGE NACIMIENTO RIV
NW OAK FLAT SEC 27, Monterey, CA
Built 2012 Load: 45.4 t ADT: 1
SALMON CREEK ROAD
FairOver: DRAINAGE SALMON CREEK
S OLD MAN RD SEC 26/28, Monterey, CA
Built 1967 Load: 45.7 t ADT: 1
STATE ROUTE 1 NB
FairOver: W156-S1 CONNECTOR RAMP
05-MON-001-R90.93, Monterey, CA
Built 1976 Load: 47.6 t ADT: 23,500
METZ RD
FairOver: CHALONE CREEK
1.1 MI N OF ELM AVE, Monterey, CA
Built 1976 Load: 52.2 t ADT: 940
BLANCO RD
FairOver: SALINAS RIVER
1 MI NE RESERVATION RD, Monterey, CA
Built 1971 Load: 52.8 t ADT: 26,300
STATE ROUTE 1
FairOver: SYCAMORE DRAW
05-MON-001-39.28, Monterey, CA
Built 1981 Load: 56.1 t ADT: 5,000
US HIGHWAY 101 SB
FairOver: SANBORN RD
05-MON-101-86.12-SAL, Monterey, CA
Built 1954 Load: 62.5 t ADT: 41,000
US HIGHWAY 101 NB
FairOver: SANBORN RD
05-MON-101-86.12-SAL, Monterey, CA
Built 1954 Load: 62.5 t ADT: 36,900
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.