County profile · official public datasets

Butte County, ID

32 public highway bridges tracked in the FHWA National Bridge Inventory: 31.3% rated Good, 68.8% Fair, 0% Poor.

32
Public bridges: 31.3%
Good condition: 0%
Poor condition

The verdict

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

Butte 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 16%
lowest Poor share in state: 0%
Poor-condition share: 32
public highway bridges: 1969
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.

Butte County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Butte County ranks #7 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Butte County, Idaho contains 32 public highway bridges. Roughly 31.3% are rated “Good,” 68.8% “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

Public highway bridges in Butte County

Good condition

31.3%

10 of 32 rated 7-9

Fair condition

68.8%

22 of 32 rated 5-6

Poor condition

0 of 32 rated 4 or below

In-state Poor-share rank

#7 of 44

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

Condition distribution

Share of 32 NBI-tracked bridges by lowest applicable component rating.

Good

31.3% (10)

Fair

68.8% (22)

Poor

0% (0)

46.9% of Butte County's bridges have passed the 50-year mark

15 of the 32 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 31.3% 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.

1920s

5
1930s

2
1950s

1
1960s

7
1970s

6
1980s

3
1990s

4
2000s

2
2010s

2

What this shows Construction peaked in the 1960s, when 7 of the county's bridges still in the inventory were built, which is 21.9% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1969, 10 years older than the Idaho average of 1979.

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

The 5 Idaho counties nearest Butte County in number of bridges, with their condition splits. Its 0% Poor share is the 2nd-lowest of these 6. Its average build year of 1969 against a peer-group mean of 1980 is 11 years older.

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

Bridge inventory size and condition shares for Butte County and the 5 Idaho counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Clark County	40	22.5%	65%	12.5%	1977
Teton County	37	43.2%	51.4%	5.4%	1992
Bear Lake County	34	41.2%	58.8%	0%	1985
Butte County (this page)	32	31.3%	68.8%	0%	1969
Franklin County	23	13%	78.3%	8.7%	1974
Oneida County	23	4.3%	95.7%	0%	1972

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

Similar inventory size

Nearest county inventories outside ID (32 bridges here).

Alpine County, CA · 32 bridges
Lincoln County, GA · 32 bridges
Alpena County, MI · 32 bridges
Wheeler County, OR · 32 bridges

Similar average build year

Nearest mean year-built outside ID (1969 here).

Cook County, IL · avg 1969 · 1,721 bridges
Fresno County, CA · avg 1969 · 916 bridges
Cuyahoga County, OH · avg 1969 · 871 bridges
Ventura County, CA · avg 1969 · 501 bridges

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

All 32 Good 10 Fair 22 Poor 0

All bridges (32)

Sort:

Butte County Bridge Snapshot

Condition distribution

46.9% of Butte County's bridges have passed the 50-year mark

How Butte 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

All bridges (32)

2150 N

3175 NORTH

3350 WEST ROAD

3400 NORTH ROAD

STC 6749;2500N

2900 NORTH ROAD

3120 N

S6844;LTL LOST RVR

STC 6749; 3300W

STC 6749; 2900N

US 93

3000N

2900N

2900 WEST

W ANTELOPE;FR 137

2800 N

2700 N

3175 NORTH

2700 N

US 93

3300 N; SYVERIA LN

US 20

FDR 40135

US 93

US 20

W ANTELOPE;FR 137

12166: CLYDE RD.

W ANTELOPE;FR 137

KNIGHTON LN;3350 N

Adams Boulevard

US 93

2400 NORTH ROAD

Related