Total bridges
271
Public highway bridges in Yolo County
County profile · official public datasets
Yolo County, CA
271 public highway bridges tracked in the FHWA National Bridge Inventory: 45.8% rated Good, 49.4% Fair, 4.8% Poor.
- 271
- Public bridges
- 45.8%
- Good condition
- 4.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Yolo County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 28%
- lowest Poor share in state
- 4.8%
- Poor-condition share
- 271
- public highway bridges
- 1966
- 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.
Yolo County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Yolo County ranks #16 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.8%). Yolo County, California contains 271 public highway bridges. Roughly 45.8% are rated “Good,” 49.4% “Fair,” and 4.8% “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
45.8%
124 of 271 rated 7-9
Fair condition
49.4%
134 of 271 rated 5-6
Poor condition
4.8%
13 of 271 rated 4 or below
In-state Poor-share rank
#16 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 271 NBI-tracked bridges by lowest applicable component rating.
Good 45.8% (124)
Fair 49.4% (134)
Poor 4.8% (13)
Yolo County's Poor-condition bridges carry 141,224 vehicle crossings a day
That is 5% of the county's reported daily bridge traffic on 4.8% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 10,863 crossings a day against 12,794 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 271 of 271 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
67.9% of Yolo County's bridges have passed the 50-year mark
184 of the 271 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 45.8% 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 63.7% of the county's Poor-condition bridge traffic
US HWY 50 (I-305) over WESTACRE RD, built 1951, carries 90,000 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 13-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 141,224 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Yolo County's bridges were built
271 bridges with a recorded construction year, grouped by decade
- 1910s 13
1910–1919
13 bridges
- 1920s 9
1920–1929
9 bridges
- 1930s 21
1930–1939
21 bridges
- 1940s 13
1940–1949
13 bridges
- 1950s
1950–1959
34 bridges
- 1960s
1960–1969
52 bridges
- 1970s
1970–1979
72 bridges
- 1980s 17
1980–1989
17 bridges
- 1990s 15
1990–1999
15 bridges
- 2000s 15
2000–2009
15 bridges
- 2010s 8
2010–2019
8 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1970s, when 72 of the county's bridges still in the inventory were built, which is 26.6% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1966) matches the California average (1970).
How Yolo County compares with California's closest counties by inventory size
The 5 California counties nearest Yolo County in number of bridges, with their condition splits. Its 4.8% Poor share is the 2nd-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1966 is in line with the group.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Placer County | 337 | 44.2% | 51.6% | 4.2% | 1976 |
| Yolo County (this page) | 271 | 45.8% | 49.4% | 4.8% | 1966 |
| Madera County | 247 | 34.8% | 53.4% | 11.7% | 1973 |
| Glenn County | 242 | 36.8% | 52.9% | 10.3% | 1954 |
| Colusa County | 211 | 40.8% | 52.1% | 7.1% | 1968 |
| Marin County | 207 | 43.5% | 46.9% | 9.7% | 1958 |
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 Yolo 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 Yolo County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (271 bridges here).
- Morgan County, AL · 271 bridges
- Yazoo County, MS · 271 bridges
- Hall County, NE · 271 bridges
- Ottawa County, OK · 271 bridges
Similar average build year
Nearest mean year-built outside CA (1966 here).
- Butler County, KS · avg 1966 · 591 bridges
- Grafton County, NH · avg 1966 · 544 bridges
- Queens County, NY · avg 1966 · 514 bridges
- Lehigh County, PA · avg 1966 · 381 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (271)
COUNTY ROAD 29
GoodOver: STATE ROUTE 113
03-YOL-113-R4.10, Yolo, CA
Built 1976 Load: 47.3 t ADT: 7,000
C.R. #24
GoodOver: SOUTH FORK WILLOW SLOUGH
APPROX. 2.5 MI E SH 505, Yolo, CA
Built 1969 Load: 53.8 t ADT: 681
C.R. 95
GoodOver: SOUTH FORK WILLOW SLOUGH
0.71 MI N OF C.R. 27, Yolo, CA
Built 1980 Load: 54.1 t ADT: 747
INTERSTATE 505
GoodOver: CHICKAHOMINY SLOUGH
03-YOL-505-3.37, Yolo, CA
Built 1980 Load: 60.9 t ADT: 12,000
COUNTY ROAD # 13
GoodOver: SLOUGH 7
0.25 MI EAST OF CR 98, Yolo, CA
Built 1979 Load: 63.8 t ADT: 1,309
INTERSTATE 5
GoodOver: SMITH CREEK
03-YOL-005-R16.74, Yolo, CA
Built 1970 Load: 66.1 t ADT: 11,750
COUNTY ROAD 95
GoodOver: UNION SCHOOL SLOUGH
0.2 MI N OF C.R. #29, Yolo, CA
Built 1980 Load: 69.0 t ADT: 1,080
COUNTY ROAD 31
GoodOver: CHICKHOMINY SLOUGH
0.27 MI W OF C.R. 91A, Yolo, CA
Built 1976 Load: 75.2 t ADT: 586
COUNTY ROAD 99S
PoorOver: INTERSTATE 5
03-YOL-005-R9.41, Yolo, CA
Built 1973 Load: 15.9 t ADT: 5,000
C. R. 41
PoorOver: CACHE CREEK
500 E SH 16, Yolo, CA
Built 1930 Load: 17.5 t ADT: 15
NB JEFFERSON BLVD
PoorOver: DEEP WATER CANAL
0.2 MI SOUTH OF STONE ST, Yolo, CA
Built 1960 Load: 22.0 t ADT: 17,439
C STREET
PoorOver: UP RR BNSF RY AMTRAK 2ND
AT 2ND STREET, Yolo, CA
Built 1958 Load: 32.1 t ADT: 4,620
COUNTY ROAD 96
PoorOver: INTERSTATE 5
03-YOL-005-R14.27, Yolo, CA
Built 1970 Load: 32.4 t ADT: 3,000
INDUSTRIAL BLVD
PoorOver: DEEP WATER CANAL & RR
0.67 MI N OF JEFFERSON BL, Yolo, CA
Built 1997 Load: 32.4 t ADT: 6,000
C. R. 29
PoorOver: CHICKAHOMINY SLOUGH
2.53 MI W OF C. R. 88, Yolo, CA
Built 1917 Load: 33.4 t ADT: 150
COUNTY ROAD 12
PoorOver: INTERSTATE 5
03-YOL-005-R18.97, Yolo, CA
Built 1970 Load: 34.3 t ADT: 3,000
US HWY 50 (I-305)
PoorOver: WESTACRE RD
03-YOL-050-2.18-WSAC, Yolo, CA
Built 1951 Load: 40.2 t ADT: 90,000
COUNTY ROAD 6
PoorOver: INTERSTATE 5
03-YOL-005-R25.57, Yolo, CA
Built 1968 Load: 42.8 t ADT: 3,000
COUNTY ROAD 91
PoorOver: INTERSTATE 5
03-YOL-005-R21.38, Yolo, CA
Built 1968 Load: 45.4 t ADT: 2,500
COUNTY ROAD 17
PoorOver: INTERSTATE 5
03-YOL-005-R12.34, Yolo, CA
Built 1970 Load: 45.7 t ADT: 5,000
COUNTY RD 13 (E10)
PoorOver: INTERSTATE 5
03-YOL-005-R17.62, Yolo, CA
Built 1970 Load: 61.2 t ADT: 1,500
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.