County profile · official public datasets

Bingham County, ID

263 public highway bridges tracked in the FHWA National Bridge Inventory: 17.1% rated Good, 79.5% Fair, 3.4% Poor.

263
Public bridges: 17.1%
Good condition: 3.4%
Poor condition

The verdict

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

Bingham County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 41%
lowest Poor share in state: 3.4%
Poor-condition share: 263
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.

Bingham County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Bingham County ranks #18 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.4%). Bingham County, Idaho contains 263 public highway bridges. Roughly 17.1% are rated “Good,” 79.5% “Fair,” and 3.4% “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

263

Public highway bridges in Bingham County

Good condition

17.1%

45 of 263 rated 7-9

Fair condition

79.5%

209 of 263 rated 5-6

Poor condition

3.4%

9 of 263 rated 4 or below

In-state Poor-share rank

#18 of 44

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

Condition distribution

Share of 263 NBI-tracked bridges by lowest applicable component rating.

Good

17.1% (45)

Fair

79.5% (209)

Poor

3.4% (9)

Bingham County's Poor-condition bridges carry 49,280 vehicle crossings a day

That is 8% of the county's reported daily bridge traffic on 3.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 5,476 crossings a day against 4,779 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 263 of 263 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

55.9% of Bingham County's bridges have passed the 50-year mark

147 of the 263 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 17.1% 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 27.9% of the county's Poor-condition bridge traffic

I 15 SBL over I15B;UPRR;S.BLACKFOOT IC, built 1961, carries 13,750 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 9-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 49,280 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

2
1930s

4
1940s

1
1950s

18
1960s

94
1970s

56
1980s

44
1990s

14
2000s

15
2010s

11
2020s

4

What this shows Construction peaked in the 1960s, when 94 of the county's bridges still in the inventory were built, which is 35.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1975) matches the Idaho average (1979).

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

The 5 Idaho counties nearest Bingham County in number of bridges, with their condition splits. Its 3.4% Poor share is the 4th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1979 is in line with the group.

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

Bridge inventory size and condition shares for Bingham County and the 5 Idaho counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Ada County	299	41.8%	58.2%	0%	1989
Canyon County	292	27.7%	69.5%	2.7%	1984
Bingham County (this page)	263	17.1%	79.5%	3.4%	1975
Shoshone County	260	21.5%	68.8%	9.6%	1971
Idaho County	215	37.2%	56.7%	6%	1975
Bonneville County	213	30.5%	66.7%	2.8%	1977

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

Similar inventory size

Nearest county inventories outside ID (263 bridges here).

Douglas County, CO · 263 bridges
Guthrie County, IA · 263 bridges
Henry County, MO · 263 bridges
Sequoyah County, OK · 263 bridges

Similar average build year

Nearest mean year-built outside ID (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.

All 263 Good 45 Fair 209 Poor 9

Fair-condition bridges (209)

Sort:

Bingham County Bridge Snapshot

Condition distribution

Bingham County's Poor-condition bridges carry 49,280 vehicle crossings a day

55.9% of Bingham County's bridges have passed the 50-year mark

One structure carries 27.9% of the county's Poor-condition bridge traffic

How Bingham 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 (209)

EXPERIMENT STATION

STC1888;FERRY BTE

N 900 W

N 900 W

HOMESTEAD ROAD

1900 SOUTH ROAD

Taylor Boulevard

HILL ROAD

THOMAS ROAD

STC1853;SWEDEN HWY

FOUNDRY ROAD

PARTRIDGE ROAD

DIGGIE ROAD

SH 39

MCDONALD ROAD

GAMBLE 2200 S

IRR BIA RTE 15

STC1842;RISING RVR

800 EAST ROAD

PARK ROAD

STC 1840;WOLVERINE

SLAUGH ROAD;S2750W

STC 1840;WOLVERINE

WASHINGTON RD;300W

STC 1840:WOLVERINE

2750 WEST ROAD

I 15 NBL

I 15 SBL

STC 1832;2000 S RD

STC 1847; E 1250 N

SH 39

US 91

STC 1829; 200 N

MONROE RD;E 1000 N

KIMBALL RD;N 400 E

STC 1833;ROSE ROAD

I 15 NBL

JAMESTON RD;N1100E

STC1837;W RIVER RD

SHEEPSKIN ROAD

SAND ROAD

FERRY BUTTE RD

SH 39

IRR BIA RTE 33

SH 39

KIMBALL RD;N 400 E

LEMHI ROAD

STC 1847; FIR ROAD

STC 1847; W FIR ST

PRESTO RD; E 500 N

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