Total bridges
121
Public highway bridges in Grand County
County profile · official public datasets
Grand County, UT
121 public highway bridges tracked in the FHWA National Bridge Inventory: 18.2% rated Good, 81.8% Fair, 0% Poor.
- 121
- Public bridges
- 18.2%
- Good condition
- 0%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Grand County pairs a top-5% lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 3%
- lowest Poor share in state
- 0%
- Poor-condition share
- 121
- public highway bridges
- 1973
- 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.
Grand County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Grand County ranks #1 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Grand County, Utah contains 121 public highway bridges. Roughly 18.2% are rated “Good,” 81.8% “Fair,” and 0% “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
18.2%
22 of 121 rated 7-9
Fair condition
81.8%
99 of 121 rated 5-6
Poor condition
0%
0 of 121 rated 4 or below
In-state Poor-share rank
#1 of 29
Among Utah counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 121 NBI-tracked bridges by lowest applicable component rating.
Good 18.2% (22)
Fair 81.8% (99)
Poor 0% (0)
58.7% of Grand County's bridges have passed the 50-year mark
71 of the 121 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 18.2% 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.
When Grand County's bridges were built
121 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1930s 4
1930–1939
4 bridges
- 1940s 6
1940–1949
6 bridges
- 1950s 13
1950–1959
13 bridges
- 1960s 12
1960–1969
12 bridges
- 1970s
1970–1979
50 bridges
- 1980s 17
1980–1989
17 bridges
- 1990s 5
1990–1999
5 bridges
- 2000s 7
2000–2009
7 bridges
- 2010s 6
2010–2019
6 bridges
What this shows Construction peaked in the 1970s, when 50 of the county's bridges still in the inventory were built, which is 41.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1973, 11 years older than the Utah average of 1984.
How Grand County compares with Utah's closest counties by inventory size
The 5 Utah counties nearest Grand County in number of bridges, with their condition splits. Its 0% Poor share is the 1st-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1982 is 9 years older.
Showing the 5 closest of 28 Utah counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Davis County | 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 (this page) | 121 | 18.2% | 81.8% | 0% | 1973 |
| Cache County | 95 | 21.1% | 72.6% | 6.3% | 1975 |
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 Grand 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 Grand County, both outside Utah so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside UT (121 bridges here).
- Sutter County, CA · 121 bridges
- Gadsden County, FL · 121 bridges
- Emanuel County, GA · 121 bridges
- Union County, LA · 121 bridges
Similar average build year
Nearest mean year-built outside UT (1973 here).
- Jefferson County, AL · avg 1973 · 1,068 bridges
- Erie County, NY · avg 1973 · 906 bridges
- Davidson County, TN · avg 1973 · 832 bridges
- Lancaster County, PA · avg 1973 · 801 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (0)
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.