Total bridges
337
Public highway bridges in Placer County
County profile · official public datasets
Placer County, CA
337 public highway bridges tracked in the FHWA National Bridge Inventory: 44.2% rated Good, 51.6% Fair, 4.2% Poor.
- 337
- Public bridges
- 44.2%
- Good condition
- 4.2%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Placer County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 19%
- lowest Poor share in state
- 4.2%
- Poor-condition share
- 337
- public highway bridges
- 1976
- 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.
Placer County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Placer County ranks #11 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.2%). Placer County, California contains 337 public highway bridges. Roughly 44.2% are rated “Good,” 51.6% “Fair,” and 4.2% “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
44.2%
149 of 337 rated 7-9
Fair condition
51.6%
174 of 337 rated 5-6
Poor condition
4.2%
14 of 337 rated 4 or below
In-state Poor-share rank
#11 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 337 NBI-tracked bridges by lowest applicable component rating.
Good 44.2% (149)
Fair 51.6% (174)
Poor 4.2% (14)
Placer County's Poor-condition bridges carry 227,371 vehicle crossings a day
That is 5.4% of the county's reported daily bridge traffic on 4.2% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 16,241 crossings a day against 12,082 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 337 of 337 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
52.2% of Placer County's bridges have passed the 50-year mark
176 of the 337 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 44.2% 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 19.8% of the county's Poor-condition bridge traffic
ROSEVILLE PARKWAY over ANTELOPE CREEK, built 2000, carries 44,970 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 14-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 227,371 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Placer County's bridges were built
337 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1920s 14
1920–1929
14 bridges
- 1930s
1930–1939
25 bridges
- 1940s 15
1940–1949
15 bridges
- 1950s
1950–1959
51 bridges
- 1960s
1960–1969
39 bridges
- 1970s
1970–1979
44 bridges
- 1980s
1980–1989
36 bridges
- 1990s
1990–1999
24 bridges
- 2000s
2000–2009
38 bridges
- 2010s
2010–2019
41 bridges
- 2020s 9
2020–2029
9 bridges
What this shows Construction peaked in the 1950s, when 51 of the county's bridges still in the inventory were built, which is 15.1% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1976, 6 years newer than the California average of 1970.
How Placer County compares with California's closest counties by inventory size
The 5 California counties nearest Placer County in number of bridges, with their condition splits. Its 4.2% Poor share is the 1st-lowest of these 6. Its average build year of 1976 against a peer-group mean of 1967 is 9 years newer.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Stanislaus County | 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 |
| Mendocino County | 357 | 34.7% | 57.7% | 7.6% | 1969 |
| Placer County (this page) | 337 | 44.2% | 51.6% | 4.2% | 1976 |
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 Placer 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 Placer County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (337 bridges here).
- Tama County, IA · 337 bridges
- Cowley County, KS · 337 bridges
- Ouachita County, LA · 337 bridges
- Windham County, VT · 337 bridges
Similar average build year
Nearest mean year-built outside CA (1976 here).
- Marion County, IN · avg 1976 · 958 bridges
- Mohave County, AZ · avg 1976 · 641 bridges
- Comanche County, OK · avg 1976 · 593 bridges
- Prince George's County, MD · avg 1976 · 576 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (14)
BRACE ROAD
PoorOver: SECRET RAVINE
JUST EAST OF I-80, Placer, CA
Built 1939 Load: 4.2 t ADT: 2,595
SQUAW VALLEY ROAD
PoorOver: SQUAW CREEK
2 MI W OF SH 89, Placer, CA
Built 1959 Load: 16.8 t ADT: 2,497
GARDEN BAR RD
PoorOver: COON CREEK
3 MI N PLEASANT RD, Placer, CA
Built 1945 Load: 17.8 t ADT: 209
INTERSTATE 80
PoorOver: UP RR BNSF RY & AMTRAK
03-PLA-080-45.71, Placer, CA
Built 1961 Load: 18.8 t ADT: 29,000
INTERSTATE 80 EB
PoorOver: BLUE CANYON ROAD
03-PLA-080-53.36, Placer, CA
Built 1959 Load: 26.6 t ADT: 13,500
STATE ROUTE 89
PoorOver: TRUCKEE RIVER
03-PLA-089-8.48, Placer, CA
Built 1928 Load: 27.9 t ADT: 11,100
INTERSTATE 80 EB
PoorOver: KINGVALE ROAD
03-PLA-080-69.23, Placer, CA
Built 1959 Load: 28.8 t ADT: 13,500
INTERSTATE 80 EB
PoorOver: HAMPSHIRE ROCKS S YUBA R
03-PLA-080-R64.54R, Placer, CA
Built 1963 Load: 29.2 t ADT: 27,000
INTERSTATE 80 WB
PoorOver: BLUE CANYON ROAD
03-PLA-080-53.36, Placer, CA
Built 1959 Load: 29.5 t ADT: 13,250
INTERSTATE 80 EB
PoorOver: TROY ROAD
03-PLA-080-68.55, Placer, CA
Built 1959 Load: 30.5 t ADT: 13,500
ROSEVILLE PARKWAY
PoorOver: ANTELOPE CREEK
0.4 MI SE OF GALLERIA BL, Placer, CA
Built 2000 Load: 32.4 t ADT: 44,970
CISCO RD
PoorOver: SOUTH YUBA RIVER
NEAR HAMPSHIRE ROCKS RD, Placer, CA
Built 1963 Load: 39.9 t ADT: 250
INTERSTATE 80 WB
PoorOver: EAST CISCO ROAD
03-PLA-080-R64.21L, Placer, CA
Built 1964 Load: 43.4 t ADT: 27,000
INTERSTATE 80
PoorOver: CARPENTER ROAD
03-PLA-080-34.99, Placer, CA
Built 1958 Load: 45.7 t ADT: 29,000
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.