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.

Total bridges

139

Public highway bridges in Davis County

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.

1930s

1
1940s

1
1950s

5
1960s

20
1970s

14
1980s

5
1990s

11
2000s

45
2010s

14
2020s

23

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.

Bridge inventory size and condition shares for Davis 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 (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.

All 139 Good 40 Fair 98 Poor 1

All bridges (139)

Sort:

Davis County Bridge Snapshot

Condition distribution

Davis County's Poor-condition bridges carry 11,728 vehicle crossings a day

25.9% of Davis County's bridges have passed the 50-year mark

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

How Davis 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

All bridges (139)

US-89 (SR-89) SBL

US-89 (SR-89) NBL

COUNTY ROAD

LAYTON PKWY SR-126

SR-67 LEGACY PKWY.

SR67 NB.RP to I-15

SR-177

US-89

CENTER STREET

I-15 (SR-15) SBL

SR 67 LEGACY PKWY.

SR-67SB RP.fr.I-15

DAVIS BOULEVARD

SHEPHERD LANE

GLOVERS LANE

I-215NB (SR-215NB)

I-84 (SR-84) EBL

SR-68 SBL

SR67SB LEGACY PKWY

I-84 (SR-84) WBL

SR-193 INT. X-ROAD

SR67NB LEGACY PKWY

US-89 (SR-89)

GLOVER LANE

Midtown Crossing

SR-67NB.LEGACY PW.

SR-106 400 NO.ST.

I-15 (SR-15) NBL

800 NORTH STREET

SR-67SB LEGACY PW.

SR-67 LEGACY PKWY.

SR-60 SO.WEBER DR.

I-215SB (SR-215)

SR-225 PARK LANE

SR-67 LEGACY PKWY

SR-67SB LEGACY PWY

200 SOUTH STREET

SR-67NB LEGACY PW.

SR-67SB LEGACY PW.

SR-227 SB.WALKER L

I-15 (SR-15)

SR-177

SR-67 LEGACY PKWY.

CENTER ST. IN NSL.

500 SOUTH STREET

US-89 (SR-89)

SR-67 LEGACY PKWY.

SR-67 LEGACY PKWY.

SR-177

Gordon Avenue

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