County profile · official public datasets

Washington County, UT

177 public highway bridges tracked in the FHWA National Bridge Inventory: 20.3% rated Good, 78.5% Fair, 1.1% Poor.

177
Public bridges: 20.3%
Good condition: 1.1%
Poor condition

The verdict

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

Washington County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 38%
lowest Poor share in state: 1.1%
Poor-condition share: 177
public highway bridges: 1987
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.

Washington County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Washington County ranks #11 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.1%). Washington County, Utah contains 177 public highway bridges. Roughly 20.3% are rated “Good,” 78.5% “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

177

Public highway bridges in Washington County

Good condition

20.3%

36 of 177 rated 7-9

Fair condition

78.5%

139 of 177 rated 5-6

Poor condition

1.1%

2 of 177 rated 4 or below

In-state Poor-share rank

#11 of 29

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

Condition distribution

Share of 177 NBI-tracked bridges by lowest applicable component rating.

Good

20.3% (36)

Fair

78.5% (139)

Poor

1.1% (2)

Washington County's Poor-condition bridges carry 15,637 vehicle crossings a day

That is 0.6% of the county's reported daily bridge traffic on 1.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 7,819 crossings a day against 21,889 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 168 of 177 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

37.3% of Washington County's bridges have passed the 50-year mark

66 of the 177 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 20.3% 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 99.7% of the county's Poor-condition bridge traffic

FOREMASTER DRIVE over RIM ROCK WASH, built 1998, carries 15,587 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 2-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 15,637 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

6
1930s

8
1940s

1
1950s

19
1960s

17
1970s

17
1980s

10
1990s

21
2000s

33
2010s

36
2020s

9

What this shows Construction peaked in the 2010s, when 36 of the county's bridges still in the inventory were built, which is 20.3% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year (1987) matches the Utah average (1984).

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

The 5 Utah counties nearest Washington 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 1987 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 Washington 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 (this page)	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
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 Washington 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 Washington County, both outside Utah so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside UT (177 bridges here).

Hale County, AL · 177 bridges
Macon County, AL · 177 bridges
Washington County, AL · 177 bridges
Seminole County, FL · 177 bridges

Similar average build year

Nearest mean year-built outside UT (1987 here).

St. Louis County, MO · avg 1987 · 912 bridges
Ellis County, TX · avg 1987 · 691 bridges
St. Louis County, MN · avg 1987 · 663 bridges
Palm Beach County, FL · avg 1987 · 610 bridges

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

All 177 Good 36 Fair 139 Poor 2

All bridges (177)

Sort:

Washington County Bridge Snapshot

Condition distribution

Washington County's Poor-condition bridges carry 15,637 vehicle crossings a day

37.3% of Washington County's bridges have passed the 50-year mark

One structure carries 99.7% of the county's Poor-condition bridge traffic

How Washington 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 (177)

I-15 (SR-15) SBL

I-15 (SR-15) NBL

I-15 NB

SR-9

DIXIE DRIVE

COUNTRY WAY

SR-7 NB

I-15NB OFF-RAMP

SR-7 SOUTHERN PKW.

SB Bluff St SR-18

Sheep Bridge Road

SR-7; So. Parkway

ZION - MOUNT CARME

SR-9

344 SOUTH

SR-7 INTCHG.X-ROAD

CENTER STREET

SR-17

LEDGES INT. X-ROAD

INTERCHG. X-ROAD.

SR-9

CO. RD. INT. X-RD

COUNTY ROAD

COUNTY ROAD

SR-9

STONEBRIDGE ROAD

600 NORTH STREET

SR-9

SR-8

GRAFTON ROAD

COUNTY ROAD

SUNBROOK DRIVE

CRYSTAL LAKES DR.

110 SOUTH STREET

PATHWAY-STORM DRN.

ACANTILADO DRIVE

I-15 (SR-15) NB&SB

SR-59

I-15 (SR-15) SBL

INDUSTRIAL ROAD

DIXIE DRIVE

I-15 (SR-15) SBL

SNOW CYN. PARKWAY

FOREST ROAD #30006

I-15NB (SR-15)

I-15SB (SR-15)

370 SOUTH

TELEGRAPH ROAD

I-15 (SR-15) NBL

I-15 (SR-15) SBL

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