Total bridges
95
Public highway bridges in Cache County
County profile · official public datasets
Cache County, UT
95 public highway bridges tracked in the FHWA National Bridge Inventory: 21.1% rated Good, 72.6% Fair, 6.3% Poor.
- 95
- Public bridges
- 21.1%
- Good condition
- 6.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Cache County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 27th
- of 29 on Poor share
- 6.3%
- Poor-condition share
- 95
- public highway bridges
- 1975
- 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.
Cache County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Cache County ranks #27 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.3%). Cache County, Utah contains 95 public highway bridges. Roughly 21.1% are rated “Good,” 72.6% “Fair,” and 6.3% “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.
Good condition
21.1%
20 of 95 rated 7-9
Fair condition
72.6%
69 of 95 rated 5-6
Poor condition
6.3%
6 of 95 rated 4 or below
In-state Poor-share rank
#27 of 29
Among Utah counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 95 NBI-tracked bridges by lowest applicable component rating.
Good 21.1% (20)
Fair 72.6% (69)
Poor 6.3% (6)
Cache County's Poor-condition bridges carry 10,428 vehicle crossings a day
That is 2.8% of the county's reported daily bridge traffic on 6.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,738 crossings a day against 3,926 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 95 of 95 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
51.6% of Cache County's bridges have passed the 50-year mark
49 of the 95 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 21.1% 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 78.2% of the county's Poor-condition bridge traffic
LOGAN CITY STREET over LOGAN RIVER, built 1983, carries 8,155 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 6-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 10,428 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Cache County's bridges were built
95 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s
1930–1939
8 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s
1950–1959
17 bridges
- 1960s
1960–1969
13 bridges
- 1970s 6
1970–1979
6 bridges
- 1980s
1980–1989
8 bridges
- 1990s
1990–1999
11 bridges
- 2000s
2000–2009
11 bridges
- 2010s
2010–2019
12 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1950s, when 17 of the county's bridges still in the inventory were built, which is 17.9% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1975, 9 years older than the Utah average of 1984.
How Cache County compares with Utah's closest counties by inventory size
The 5 Utah counties nearest Cache County in number of bridges, with their condition splits. Its 6.3% Poor share is the 6th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1980 is 5 years older.
Showing the 5 closest of 28 Utah counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Cache County (this page) | 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 | 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 Cache 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 Cache County, both outside Utah so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside UT (95 bridges here).
- Pike County, AR · 95 bridges
- Camden County, GA · 95 bridges
- Liberty County, GA · 95 bridges
- Fulton County, KY · 95 bridges
Similar average build year
Nearest mean year-built outside UT (1975 here).
- San Bernardino County, CA · avg 1975 · 1,422 bridges
- Lane County, OR · avg 1975 · 1,010 bridges
- Fulton County, GA · avg 1975 · 775 bridges
- Westmoreland County, PA · avg 1975 · 620 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (6)
ROAD 20264
PoorOver: LOGAN RIVER
10 M NE OF LOGAN V RT 89, Cache, UT
Built 1951 Load: 8.4 t ADT: 50
ROAD 20157
PoorOver: LT HD FORK BLACKSMITH
17 M NE OF LOGAN, Cache, UT
Built 1954 Load: 12.0 t ADT: 50
ROAD 20012
PoorOver: LOGAN RIVER
12 M NE OF LOGAN V RT 89, Cache, UT
Built 1968 Load: 15.2 t ADT: 50
ROAD 20024
PoorOver: LOGAN RIVER
9 M NE OF LOGAN V RT 89, Cache, UT
Built 1972 Load: 15.6 t ADT: 50
LOGAN CITY STREET
PoorOver: LOGAN RIVER
800 E. CENTER ST. LOGAN, Cache, UT
Built 1983 Load: 21.7 t ADT: 8,155
COUNTY ROAD
PoorOver: BEAR RIVER
1.5 MILES NO. OF TRENTON, Cache, UT
Built 1925 Load: 39.5 t ADT: 2,073
Read our methodology - how this data is sourced, computed, and verified.
Related
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.