County profile · official public datasets

Weber County, UT

129 public highway bridges tracked in the FHWA National Bridge Inventory: 14.7% rated Good, 80.6% Fair, 4.7% Poor.

129
Public bridges: 14.7%
Good condition: 4.7%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Weber County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

24th
of 29 on Poor share: 4.7%
Poor-condition share: 129
public highway bridges: 1979
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.

Weber County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Weber County ranks #24 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.7%). Weber County, Utah contains 129 public highway bridges. Roughly 14.7% are rated “Good,” 80.6% “Fair,” and 4.7% “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.

Total bridges

129

Public highway bridges in Weber County

Good condition

14.7%

19 of 129 rated 7-9

Fair condition

80.6%

104 of 129 rated 5-6

Poor condition

4.7%

6 of 129 rated 4 or below

In-state Poor-share rank

#24 of 29

Among Utah counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 129 NBI-tracked bridges by lowest applicable component rating.

Good

14.7% (19)

Fair

80.6% (104)

Poor

4.7% (6)

Weber County's Poor-condition bridges carry 40,542 vehicle crossings a day

That is 1.1% of the county's reported daily bridge traffic on 4.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 6,757 crossings a day against 48,157 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 127 of 129 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

51.2% of Weber County's bridges have passed the 50-year mark

66 of the 129 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 14.7% 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 54.4% of the county's Poor-condition bridge traffic

I-84 (SR-84) WBL over 4400 SOUTH STREET, built 1967, carries 22,044 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 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 40,542 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

1
1930s

8
1940s

3
1950s

14
1960s

32
1970s

11
1980s

9
1990s

10
2000s

34
2010s

2
2020s

4

What this shows Construction peaked in the 2000s, when 34 of the county's bridges still in the inventory were built, which is 26.4% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1979, 5 years older than the Utah average of 1984.

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

The 5 Utah counties nearest Weber County in number of bridges, with their condition splits. Its 4.7% Poor share is the 6th-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1983 is in line with the group.

Showing the 5 closest of 28 Utah counties eligible for comparison.

Bridge inventory size and condition shares for Weber County and the 5 Utah counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Sevier County	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 (this page)	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 Weber 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 Weber County, both outside Utah so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside UT (129 bridges here).

Clay County, AL · 129 bridges
Cross County, AR · 129 bridges
Lake County, CA · 129 bridges
Lincoln County, CO · 129 bridges

Similar average build year

Nearest mean year-built outside UT (1979 here).

Pima County, AZ · avg 1979 · 1,150 bridges
Jefferson County, KY · avg 1979 · 662 bridges
Spartanburg County, SC · avg 1979 · 638 bridges
McPherson County, KS · avg 1979 · 586 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 129 Good 19 Fair 104 Poor 6

Good-condition bridges (19)

Sort:

Weber County Bridge Snapshot

Condition distribution

Weber County's Poor-condition bridges carry 40,542 vehicle crossings a day

51.2% of Weber County's bridges have passed the 50-year mark

One structure carries 54.4% of the county's Poor-condition bridge traffic

How Weber 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

Good-condition bridges (19)

ROAD 20076

CITY STREET

SR-134

CITY STREET

CITY STREET

FARR WEST CITY ST.

COUNTY ROAD

I-15 NB (SR-15)

I-15 (SR-15) NB

I-15SB (SR-215)

Church Street

I-15 NB

I-15 SB

WEBER COUNTY ROAD

SR-39

I-15NB (SR-15)

I-15SB (SR-15)

I-15 NB OFF-RAMP

I-15 SB (SR-15)

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