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.

Total bridges

157

Public highway bridges in Sevier County

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.

1920s

3
1930s

2
1940s

3
1950s

6
1960s

5
1970s

24
1980s

83
1990s

9
2000s

15
2010s

5
2020s

2

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.

Bridge inventory size and condition shares for Sevier County and the 5 Utah counties closest to it in inventory size
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.

All 157 Good 30 Fair 126 Poor 1

Fair-condition bridges (126)

Sort:

Sevier County Bridge Snapshot

Condition distribution

Sevier County's Poor-condition bridges carry 1,559 vehicle crossings a day

19.1% of Sevier County's bridges have passed the 50-year mark

One structure carries 100% of the county's Poor-condition bridge traffic

How Sevier County compares with Utah's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (126)

I-70 (SR-70) WBL

COUNTY ROAD

I-70 (SR-70) EBL

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70) WBL

COLLEGE AVENUE

CO.FNTG.RD.AJ.I-70

SR-119

CO.RD. INT.X-ROAD.

I-70 (SR-70) WBL

I-70 (SR-70)

I-70 (SR-70)

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70) EBL

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70) WBL

I-70 (SR-70) WBL

I-70 (SR-70)

SR-24

I-70 (SR-70) EBL

I-70 (SR-70) WBL

CO.RD. OLD US-89

SR-70 (I-70) EBL

US-50(SR-50)

SR-70 (I-70) EBL

SR-70 (I-70) WBL

I-70 (SR-70) EBL

500 NORTH STREET

SR-70 (I-70) WBL

COUNTY ROAD

I-70 (SR-70)

I-70 (SR-70) WBL

I-70 (SR-70) EBL

I-70 (SR-70) EBL

I-70 (SR-70) WBL

COUNTY ROAD

CLEAR CRK.CYN.ROAD

I-70 (SR-70)

I-70 (SR-70) EBL

I-70 (SR-70) WBL

COUNTY ROAD

US-50 (SR-50)

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70)

I-70 (SR-70) WBL

I-70 (SR-70) EBL

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