County profile · official public datasets

Grand County, UT

121 public highway bridges tracked in the FHWA National Bridge Inventory: 18.2% rated Good, 81.8% Fair, 0% Poor.

121
Public bridges: 18.2%
Good condition: 0%
Poor condition

The verdict

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

Grand County pairs a top-5% lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 3%
lowest Poor share in state: 0%
Poor-condition share: 121
public highway bridges: 1973
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.

Grand County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grand County ranks #1 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Grand County, Utah contains 121 public highway bridges. Roughly 18.2% are rated “Good,” 81.8% “Fair,” and 0% “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

121

Public highway bridges in Grand County

Good condition

18.2%

22 of 121 rated 7-9

Fair condition

81.8%

99 of 121 rated 5-6

Poor condition

0 of 121 rated 4 or below

In-state Poor-share rank

#1 of 29

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

Condition distribution

Share of 121 NBI-tracked bridges by lowest applicable component rating.

Good

18.2% (22)

Fair

81.8% (99)

Poor

0% (0)

58.7% of Grand County's bridges have passed the 50-year mark

71 of the 121 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 18.2% 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.

1910s

1
1930s

4
1940s

6
1950s

13
1960s

12
1970s

50
1980s

17
1990s

5
2000s

7
2010s

6

What this shows Construction peaked in the 1970s, when 50 of the county's bridges still in the inventory were built, which is 41.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1973, 11 years older than the Utah average of 1984.

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

The 5 Utah counties nearest Grand County in number of bridges, with their condition splits. Its 0% Poor share is the 1st-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1982 is 9 years older.

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

Bridge inventory size and condition shares for Grand County and the 5 Utah counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
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
Emery County	126	18.3%	81%	0.8%	1979
Grand County (this page)	121	18.2%	81.8%	0%	1973
Cache County	95	21.1%	72.6%	6.3%	1975

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

Similar inventory size

Nearest county inventories outside UT (121 bridges here).

Sutter County, CA · 121 bridges
Gadsden County, FL · 121 bridges
Emanuel County, GA · 121 bridges
Union County, LA · 121 bridges

Similar average build year

Nearest mean year-built outside UT (1973 here).

Jefferson County, AL · avg 1973 · 1,068 bridges
Erie County, NY · avg 1973 · 906 bridges
Davidson County, TN · avg 1973 · 832 bridges
Lancaster County, PA · avg 1973 · 801 bridges

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

All 121 Good 22 Fair 99 Poor 0

Fair-condition bridges (99)

Sort:

Grand County Bridge Snapshot

Condition distribution

58.7% of Grand County's bridges have passed the 50-year mark

How Grand 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

Fair-condition bridges (99)

US-191 (SR-191)

I-70 (SR-70)

I-70 (SR-70) WBL

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

COUNTY ROAD

US-191 (SR-191)

SR-128 INT.X-ROAD.

COUNTY ROAD

COUNTY ROAD

I-70 (SR-70) EBL

I-70 (SR-70) EBL

CO. RD. INT.

CO.RD. INTCHG.X-RD

PARK ENTRANCE ROAD

COUNTY ROAD

COUNTY ROAD

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70) WBL

SR-128

I-70 (SR-70) EBL

I-70 (SR-70) WBL

COUNTY ROAD

300 SOUTH STREET

SR-19 INTCH.X-ROAD

CO.RD. INTCHG.X-RD

PARK ENTRANCE ROAD

SR-279

US-191

I-70 (SR-70) EBL

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70) WBL

I-70 (SR-70) EBL

I-70 (SR-70) WBL

I-70 (SR-70)

SR-128

I-70 (SR-70) EBL

I-70 (SR-70) EBL

I-70 (SR-70) WBL

WINDY MESA ROAD

WINDY MESA ROAD

US-191 (SR-191)

SR-128

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