Total bridges
157
Public highway bridges in Sevier County
County profile · official public datasets
Sevier County, UT
157 public highway bridges tracked in the FHWA National Bridge Inventory: 19.1% rated Good, 80.3% Fair, 0.6% Poor.
- 157
- Public bridges
- 19.1%
- Good condition
- 0.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Sevier County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 24%
- lowest Poor share in state
- 0.6%
- Poor-condition share
- 157
- public highway bridges
- 1983
- 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.
Sevier County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Sevier County ranks #7 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.6%). Sevier County, Utah contains 157 public highway bridges. Roughly 19.1% are rated “Good,” 80.3% “Fair,” and 0.6% “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
19.1%
30 of 157 rated 7-9
Fair condition
80.3%
126 of 157 rated 5-6
Poor condition
0.6%
1 of 157 rated 4 or below
In-state Poor-share rank
#7 of 29
Among Utah counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 157 NBI-tracked bridges by lowest applicable component rating.
Good 19.1% (30)
Fair 80.3% (126)
Poor 0.6% (1)
Sevier County's Poor-condition bridges carry 1,559 vehicle crossings a day
That is 0.2% of the county's reported daily bridge traffic on 0.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,559 crossings a day against 1,489 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 157 of 157 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
19.1% of Sevier County's bridges have passed the 50-year mark
30 of the 157 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 19.1% 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
US-89 (SR-89) over CLEAR CREEK, built 1929, carries 1,559 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 1,559 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Sevier County's bridges were built
157 bridges with a recorded construction year, grouped by decade
- 1920s 3
1920–1929
3 bridges
- 1930s 2
1930–1939
2 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s 6
1950–1959
6 bridges
- 1960s 5
1960–1969
5 bridges
- 1970s 24
1970–1979
24 bridges
- 1980s
1980–1989
83 bridges
- 1990s 9
1990–1999
9 bridges
- 2000s 15
2000–2009
15 bridges
- 2010s 5
2010–2019
5 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1980s, when 83 of the county's bridges still in the inventory were built, which is 52.9% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1983) matches the Utah average (1984).
How Sevier County compares with Utah's closest counties by inventory size
The 5 Utah counties nearest Sevier County in number of bridges, with their condition splits. Its 0.6% Poor share is the 1st-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1984 is in line with the group.
Showing the 5 closest of 28 Utah counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Box Elder County | 184 | 23.4% | 70.7% | 6% | 1977 |
| Washington County | 177 | 20.3% | 78.5% | 1.1% | 1987 |
| Sevier County (this page) | 157 | 19.1% | 80.3% | 0.6% | 1983 |
| 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 |
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 Sevier 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 Sevier County, both outside Utah so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside UT (157 bridges here).
- Lowndes County, AL · 157 bridges
- Jefferson County, IA · 157 bridges
- Franklin County, MS · 157 bridges
- Washington County, MO · 157 bridges
Similar average build year
Nearest mean year-built outside UT (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 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.