Total bridges
139
Public highway bridges in Davis County
County profile · official public datasets
Davis County, UT
139 public highway bridges tracked in the FHWA National Bridge Inventory: 28.8% rated Good, 70.5% Fair, 0.7% Poor.
- 139
- Public bridges
- 28.8%
- Good condition
- 0.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Davis County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 28%
- lowest Poor share in state
- 0.7%
- Poor-condition share
- 139
- public highway bridges
- 1996
- 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.
Davis County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Davis County ranks #8 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.7%). Davis County, Utah contains 139 public highway bridges. Roughly 28.8% are rated “Good,” 70.5% “Fair,” and 0.7% “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
28.8%
40 of 139 rated 7-9
Fair condition
70.5%
98 of 139 rated 5-6
Poor condition
0.7%
1 of 139 rated 4 or below
In-state Poor-share rank
#8 of 29
Among Utah counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 139 NBI-tracked bridges by lowest applicable component rating.
Good 28.8% (40)
Fair 70.5% (98)
Poor 0.7% (1)
Davis County's Poor-condition bridges carry 11,728 vehicle crossings a day
That is 0.3% of the county's reported daily bridge traffic on 0.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 11,728 crossings a day against 42,254 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 133 of 139 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
25.9% of Davis County's bridges have passed the 50-year mark
36 of the 139 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 28.8% 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 100% of the county's Poor-condition bridge traffic
STATE STREET over I-15 (SR-15) UPRR &, built 1973, carries 11,728 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 1-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 11,728 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Davis County's bridges were built
139 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s 5
1950–1959
5 bridges
- 1960s
1960–1969
20 bridges
- 1970s 14
1970–1979
14 bridges
- 1980s 5
1980–1989
5 bridges
- 1990s 11
1990–1999
11 bridges
- 2000s
2000–2009
45 bridges
- 2010s 14
2010–2019
14 bridges
- 2020s
2020–2029
23 bridges
What this shows Construction peaked in the 2000s, when 45 of the county's bridges still in the inventory were built, which is 32.4% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1996, 12 years newer than the Utah average of 1984.
How Davis County compares with Utah's closest counties by inventory size
The 5 Utah counties nearest Davis County in number of bridges, with their condition splits. Its 0.7% Poor share is the 3rd-lowest of these 6. Its average build year of 1996 against a peer-group mean of 1979 is 17 years newer.
Showing the 5 closest of 28 Utah counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Sevier County | 157 | 19.1% | 80.3% | 0.6% | 1983 |
| Davis County (this page) | 139 | 28.8% | 70.5% | 0.7% | 1996 |
| Summit County | 138 | 14.5% | 81.2% | 4.3% | 1982 |
| Weber County | 129 | 14.7% | 80.6% | 4.7% | 1979 |
| Emery County | 126 | 18.3% | 81% | 0.8% | 1979 |
| Grand County | 121 | 18.2% | 81.8% | 0% | 1973 |
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 Davis 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 Davis County, both outside Utah so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside UT (139 bridges here).
- Bulloch County, GA · 139 bridges
- St. Helena County, LA · 139 bridges
- Garrett County, MD · 139 bridges
- Midland County, MI · 139 bridges
Similar average build year
Nearest mean year-built outside UT (1996 here).
- Clark County, NV · avg 1996 · 1,141 bridges
- Hamilton County, IN · avg 1996 · 454 bridges
- Hays County, TX · avg 1996 · 272 bridges
- Jackson County, MS · avg 1996 · 268 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (1)
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.