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

84

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

6%

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.

When Duchesne County's bridges were built

84 bridges with a recorded construction year, grouped by decade

bridges

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).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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 Poor
Cache County 95 6.3%
Garfield County 94 3.2%
Uintah County 91 3.3%
Duchesne County (this page) 84 6%
Carbon County 73 2.7%
Millard County 72 1.4%

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).

Similar average build year

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

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

Good-condition bridges (22)

HELLS CAN-FISH CR

Good

Over: HELLS CANYON

3.30 MI N JCT 10119, Duchesne, UT

Built 2022 ADT: 50

COUNTY ROAD

Good

Over: RED CREEK

24.6 MI. WEST OF DUCHESNE, Duchesne, UT

Built 1981 Load: 23.7 t ADT: 126

FR134

Good

Over: Rock Creek

Upper Stillwater Dam, Duchesne, UT

Built 1987 Load: 29.7 t ADT: 100

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

10.5 MILES W. OF DUCHESNE, Duchesne, UT

Built 1998 Load: 32.4 t ADT: 126

Avintaquin Road

Good

Over: Strawberry River

18.5 MI West of Duchesne, Duchesne, UT

Built 2022 Load: 32.4 t ADT: 25

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

9 MILES WEST OF DUCHESNE, Duchesne, UT

Built 1998 Load: 32.7 t ADT: 126

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

9.5 MILE WEST OF DUCHESNE, Duchesne, UT

Built 1998 Load: 33.4 t ADT: 126

FDR

Good

Over: SOUTH FORK ROCK CREEK

5.4 MI WEST/JNCTN #10134, Duchesne, UT

Built 2022 Load: 33.4 t ADT: 50

COUNTY ROAD

Good

Over: DUCHESNE RIVER

7 MILES SW. OF TALMAGE, Duchesne, UT

Built 1952 Load: 34.0 t ADT: 45

Cobblestone Rd

Good

Over: Duchesne River

Over Duchesne River, Duchesne, UT

Built 2017 Load: 34.7 t ADT: 100

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

16 MILES WEST OF DUCHESNE, Duchesne, UT

Built 2002 Load: 36.9 t ADT: 126

300 North

Good

Over: Cottonwood Creek

300 N over Cottonwood Crk, Duchesne, UT

Built 2016 Load: 37.6 t ADT: 1,000

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

15 Mi. W of Duchesne, Duchesne, UT

Built 2002 Load: 37.9 t ADT: 126

DUCHESNE CITY ST.

Good

Over: STRAWBERRY RIVER

SO. SIDE OF DUCHESNE CITY, Duchesne, UT

Built 2008 Load: 40.2 t ADT: 310

SR-35

Good

Over: NO. FORK DUCHESNE RIVER

10 MILES NW. OF TABONIA, Duchesne, UT

Built 1998 Load: 41.5 t ADT: 584

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

13 MILES WEST OF DUCHESNE, Duchesne, UT

Built 2002 Load: 47.3 t ADT: 126

MOON LAKE

Good

Over: TWIN POTTS CREEK

9 MI N MOUNTAIN HOME UT, Duchesne, UT

Built 2016 Load: 48.9 t ADT: 50

N/FK DUCHESNE

Good

Over: HADES CREEK

6.60 MI N JCT U-35, Duchesne, UT

Built 2015 Load: 48.9 t ADT: 50

COUNTY ROAD

Good

Over: STRAWBERRY RIVER

14 MILES WEST OF DUCHESNE, Duchesne, UT

Built 2002 Load: 52.5 t ADT: 126

US-40 (SR-40)

Good

Over: BRIDGELAND-MYTON WASH

13.8 MI.EAST OF DUCHESNE, Duchesne, UT

Built 1954 Load: 58.6 t ADT: 5,510

YELLOWSTONE LOOP

Good

Over: NO DATA ENTERED

10 MILE N OF MT HOME, Duchesne, UT

Built 2019 Load: 59.9 t ADT: 50

County Road

Good

Over: Duchesne River

38250 W over Duchesne Riv, Duchesne, UT

Built 2017 Load: 70.3 t ADT: 50

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.