County profile · official public datasets

Duchesne County, UT

84 public highway bridges tracked in the FHWA National Bridge Inventory: 26.2% rated Good, 67.9% Fair, 6% Poor.

84
Public bridges: 26.2%
Good condition: 6%
Poor condition

The verdict

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

Duchesne County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.

25th
of 29 on Poor share: 6%
Poor-condition share: 84
public highway bridges: 1984
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.

Duchesne County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Duchesne County ranks #25 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6%). Duchesne County, Utah contains 84 public highway bridges. Roughly 26.2% are rated “Good,” 67.9% “Fair,” and 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

Public highway bridges in Duchesne County

Good condition

26.2%

22 of 84 rated 7-9

Fair condition

67.9%

57 of 84 rated 5-6

Poor condition

5 of 84 rated 4 or below

In-state Poor-share rank

#25 of 29

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

Condition distribution

Share of 84 NBI-tracked bridges by lowest applicable component rating.

Good

26.2% (22)

Fair

67.9% (57)

Poor

6% (5)

Duchesne County's Poor-condition bridges carry 1,034 vehicle crossings a day

That is 0.8% of the county's reported daily bridge traffic on 6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 207 crossings a day against 408 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 84 of 84 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

39.3% of Duchesne County's bridges have passed the 50-year mark

33 of the 84 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 26.2% 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 75.7% of the county's Poor-condition bridge traffic

SR-35 over DUCHESNE RIVER, built 1967, carries 783 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 5-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,034 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1940s

3
1950s

14
1960s

13
1970s

6
1980s

10
1990s

13
2000s

13
2010s

9
2020s

3

What this shows Construction peaked in the 1950s, when 14 of the county's bridges still in the inventory were built, which is 16.7% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year (1984) matches the Utah average (1984).

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

The 5 Utah counties nearest Duchesne County in number of bridges, with their condition splits. Its 6% Poor share is the 5th-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1979 is 5 years newer.

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

Bridge inventory size and condition shares for Duchesne County and the 5 Utah counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Cache County	95	21.1%	72.6%	6.3%	1975
Garfield County	94	22.3%	74.5%	3.2%	1977
Uintah County	91	31.9%	64.8%	3.3%	1989
Duchesne County (this page)	84	26.2%	67.9%	6%	1984
Carbon County	73	19.2%	78.1%	2.7%	1974
Millard County	72	12.5%	86.1%	1.4%	1978

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

Similar inventory size

Nearest county inventories outside UT (84 bridges here).

Chaffee County, CO · 84 bridges
Elbert County, GA · 84 bridges
Glynn County, GA · 84 bridges
Paulding County, GA · 84 bridges

Similar average build year

Nearest mean year-built outside UT (1984 here).

Hennepin County, MN · avg 1984 · 936 bridges
Duval County, FL · avg 1984 · 831 bridges
El Paso County, CO · avg 1984 · 686 bridges
Bell County, TX · avg 1984 · 660 bridges

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

All 84 Good 22 Fair 57 Poor 5

All bridges (84)

Sort:

Duchesne County Bridge Snapshot

Condition distribution

Duchesne County's Poor-condition bridges carry 1,034 vehicle crossings a day

39.3% of Duchesne County's bridges have passed the 50-year mark

One structure carries 75.7% of the county's Poor-condition bridge traffic

How Duchesne 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 (84)

COUNTY ROAD

TABBY SWALE ROAD

COUNTY ROAD

COUNTY ROAD

SR-121

COUNTY ROAD

COUNTY ROAD

UINTAH RIVER ROAD

US-40 (SR-40)

UINTAH RIVER ROAD

SR-87

ROCK CREEK

SR-208

BEAVER SLD.RD. CO.

COUNTY ROAD

US-40 (SR-40)

COUNTY ROAD #134

COUNTY ROAD

DUCHESNE CITY ST.

FDR

IRR BIA RTE 17

SR-208

W/F WHITEROCKS

US-40 (SR-40)

COUNTY ROAD 1500 N

US-40 (SR-40)

SR-121

SR-87

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

MOON LAKE ROAD

ELKHORN LOOP

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

IRR BIA 7

SUNDOWN RIDGE RD.

US-40 (SR-40)

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

SR-191

US-40 (SR-40)

US-40 (SR-40)

US-40 (SR-40)

COUNTY ROAD

COUNTY ROAD

Related