County profile · official public datasets

Oneida County, ID

23 public highway bridges tracked in the FHWA National Bridge Inventory: 4.3% rated Good, 95.7% Fair, 0% Poor.

23
Public bridges: 4.3%
Good condition: 0%
Poor condition

The verdict

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

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

Top 18%
lowest Poor share in state: 0%
Poor-condition share: 23
public highway bridges: 1972
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.

Oneida County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Oneida County ranks #8 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Oneida County, Idaho contains 23 public highway bridges. Roughly 4.3% are rated “Good,” 95.7% “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

Public highway bridges in Oneida County

Good condition

4.3%

1 of 23 rated 7-9

Fair condition

95.7%

22 of 23 rated 5-6

Poor condition

0 of 23 rated 4 or below

In-state Poor-share rank

#8 of 44

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

Condition distribution

Share of 23 NBI-tracked bridges by lowest applicable component rating.

Good

4.3% (1)

Fair

95.7% (22)

Poor

0% (0)

60.9% of Oneida County's bridges have passed the 50-year mark

14 of the 23 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 4.3% 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.

1960s

9
1970s

13
1990s

1

What this shows Construction peaked in the 1970s, when 13 of the county's bridges still in the inventory were built, which is 56.5% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1972, 7 years older than the Idaho average of 1979.

How Oneida County compares with Idaho's closest counties by inventory size

The 5 Idaho counties nearest Oneida County in number of bridges, with their condition splits. Its 0% Poor share is the 3rd-lowest of these 6. Its average build year of 1972 against a peer-group mean of 1982 is 10 years older.

Showing the 5 closest of 43 Idaho counties eligible for comparison.

Bridge inventory size and condition shares for Oneida County and the 5 Idaho counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Teton County	37	43.2%	51.4%	5.4%	1992
Bear Lake County	34	41.2%	58.8%	0%	1985
Butte County	32	31.3%	68.8%	0%	1969
Franklin County	23	13%	78.3%	8.7%	1974
Oneida County (this page)	23	4.3%	95.7%	0%	1972
Lewis County	21	57.1%	38.1%	4.8%	1991

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

Similar inventory size

Nearest county inventories outside ID (23 bridges here).

Powder River County, MT · 23 bridges
Keya Paha County, NE · 23 bridges
Nelson County, ND · 23 bridges
Vega Baja County, PR · 23 bridges

Similar average build year

Nearest mean year-built outside ID (1972 here).

Santa Clara County, CA · avg 1972 · 964 bridges
Madison County, AL · avg 1972 · 710 bridges
Kern County, CA · avg 1972 · 668 bridges
York County, PA · avg 1972 · 569 bridges

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

All 23 Good 1 Fair 22 Poor 0

Fair-condition bridges (22)

Sort:

Oneida County Bridge Snapshot

Condition distribution

60.9% of Oneida County's bridges have passed the 50-year mark

How Oneida County compares with Idaho'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 (22)

SUMMIT RD.

STC 1702;SAMARIA

I 15 NBL

I 15 SBL

I 15 NBL

I 15 SBL

I 15 NBL

I 15 NBL

I 15 SBL

I 15 NBL

I 15 SBL

I 84 EBL

I 84 WBL

I 84 WBL

I 84 WBL

I 84 EBL

I 84 EBL

SH 36

I 84 WBL

I 84 EBL

I 15 NBL

I 15 SBL

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