County profile · official public datasets

Utah County, UT

271 public highway bridges tracked in the FHWA National Bridge Inventory: 37.3% rated Good, 61.6% Fair, 1.1% Poor.

271
Public bridges: 37.3%
Good condition: 1.1%
Poor condition

The verdict

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

Utah 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 34%
lowest Poor share in state: 1.1%
Poor-condition share: 271
public highway bridges: 1995
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.

Utah County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Utah County ranks #10 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.1%). Utah County, Utah contains 271 public highway bridges. Roughly 37.3% are rated “Good,” 61.6% “Fair,” and 1.1% “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

271

Public highway bridges in Utah County

Good condition

37.3%

101 of 271 rated 7-9

Fair condition

61.6%

167 of 271 rated 5-6

Poor condition

1.1%

3 of 271 rated 4 or below

In-state Poor-share rank

#10 of 29

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

Condition distribution

Share of 271 NBI-tracked bridges by lowest applicable component rating.

Good

37.3% (101)

Fair

61.6% (167)

Poor

1.1% (3)

Utah County's Poor-condition bridges carry 3,780 vehicle crossings a day

That is 0% of the county's reported daily bridge traffic on 1.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,260 crossings a day against 60,252 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 270 of 271 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

21% of Utah County's bridges have passed the 50-year mark

57 of the 271 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 37.3% 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 60% of the county's Poor-condition bridge traffic

200 SOUTH STREET over AMERICAN FORK CREEK, built 1925, carries 2,268 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 3-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 3,780 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

2
1930s

2
1940s

4
1950s

11
1960s

30
1970s

17
1980s

26
1990s

23
2000s

36
2010s

102
2020s

17

What this shows Construction peaked in the 2010s, when 102 of the county's bridges still in the inventory were built, which is 37.6% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1995, 11 years newer than the Utah average of 1984.

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

The 5 Utah counties nearest Utah County in number of bridges, with their condition splits. Its 1.1% Poor share is the 3rd-lowest of these 6. Its average build year of 1995 against a peer-group mean of 1985 is 10 years newer.

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

Bridge inventory size and condition shares for Utah County and the 5 Utah counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Utah County (this page)	271	37.3%	61.6%	1.1%	1995
Box Elder County	184	23.4%	70.7%	6%	1977
Washington County	177	20.3%	78.5%	1.1%	1987
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

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 Utah 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 Utah County, both outside Utah so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside UT (271 bridges here).

Morgan County, AL · 271 bridges
Yolo County, CA · 271 bridges
Yazoo County, MS · 271 bridges
Hall County, NE · 271 bridges

Similar average build year

Nearest mean year-built outside UT (1995 here).

Williamson County, TX · avg 1995 · 1,170 bridges
Craighead County, AR · avg 1995 · 442 bridges
DeSoto County, MS · avg 1995 · 266 bridges
Scotland County, MO · avg 1995 · 201 bridges

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

All 271 Good 101 Fair 167 Poor 3

All bridges (271)

Sort:

Utah County Bridge Snapshot

Condition distribution

Utah County's Poor-condition bridges carry 3,780 vehicle crossings a day

21% of Utah County's bridges have passed the 50-year mark

One structure carries 60% of the county's Poor-condition bridge traffic

How Utah 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 (271)

I-15NB (SR-15)

800 E. ST. IN OREM

US-6 (SR-6)

I-15NB (SR-15)

SR-180 5th East

I-15SB (SR-15)

700 EAST STREET

I-15 NB

I-15 SB

SR-265 WBL

2300 West in Lehi

SR-75 INT. X-RD.

I-15 NB

SR-265 EBL

SR-92WB COMUTR.LN.

I-15 NB

Triumph Blvd

I-15NB (SR-15)

I-15SB (SR-15)

SR-6

I-15NB (SR-15)

I-15NB (SR-15)

PROCTOR LANE

I-15 NB RP.to SR-6

I-15NB (SR-15)

I-15 SB

I-15 SB

Lehi Main St

US-6WB (SR-6)

I-15 (SR-15)

I-15NB (SR-15)

SR-77 (4th SOUTH)

2700 N.ST.in SP.FK

CENTER STREET

400 WEST STREET

SAM WHITE ROAD

2000 SO. in LINDON

6TH EAST

CITY STREET

I-15SB (SR-15)

I-15

I-15SB (SR-15)

SR-194 WB 2100 No.

I-15 (SR-15) NBL

I-15 (SR-15) SBL

I-15

SR-176 Vineyard

600 N in Lehi

I-15 NB Off Ramp

I-15 NB

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