County profile · official public datasets

Camas County, ID

61 public highway bridges tracked in the FHWA National Bridge Inventory: 27.9% rated Good, 62.3% Fair, 9.8% Poor.

61
Public bridges: 27.9%
Good condition: 9.8%
Poor condition

The verdict

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

Camas County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.

41st
of 44 on Poor share: 9.8%
Poor-condition share: 61
public highway bridges: 1978
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.

Camas County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Camas County ranks #41 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.8%). Camas County, Idaho contains 61 public highway bridges. Roughly 27.9% are rated “Good,” 62.3% “Fair,” and 9.8% “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 Camas County

Good condition

27.9%

17 of 61 rated 7-9

Fair condition

62.3%

38 of 61 rated 5-6

Poor condition

9.8%

6 of 61 rated 4 or below

In-state Poor-share rank

#41 of 44

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

Condition distribution

Share of 61 NBI-tracked bridges by lowest applicable component rating.

Good

27.9% (17)

Fair

62.3% (38)

Poor

9.8% (6)

Camas County's Poor-condition bridges carry 742 vehicle crossings a day

That is 2.6% of the county's reported daily bridge traffic on 9.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 124 crossings a day against 175 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 61 of 61 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

54.1% of Camas County's bridges have passed the 50-year mark

33 of the 61 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 27.9% 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 79.5% of the county's Poor-condition bridge traffic

SH 46 over MINEAR CREEK, built 1955, carries 590 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 742 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1940s

1
1950s

18
1960s

13
1970s

4
1980s

7
1990s

1
2000s

2
2010s

7
2020s

7

What this shows Construction peaked in the 1950s, when 18 of the county's bridges still in the inventory were built, which is 29.5% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year (1978) matches the Idaho average (1979).

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

The 5 Idaho counties nearest Camas County in number of bridges, with their condition splits. Its 9.8% Poor share is the 5th-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1975 is in line with the group.

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

Bridge inventory size and condition shares for Camas County and the 5 Idaho counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Power County	70	28.6%	68.6%	2.9%	1973
Minidoka County	66	28.8%	71.2%	0%	1983
Payette County	65	13.8%	81.5%	4.6%	1970
Camas County (this page)	61	27.9%	62.3%	9.8%	1978
Gem County	57	28.1%	70.2%	1.8%	1976
Lincoln County	53	18.9%	58.5%	22.6%	1973

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

Similar inventory size

Nearest county inventories outside ID (61 bridges here).

Amador County, CA · 61 bridges
Cheyenne County, CO · 61 bridges
Montezuma County, CO · 61 bridges
Atkinson County, GA · 61 bridges

Similar average build year

Nearest mean year-built outside ID (1978 here).

Orange County, CA · avg 1978 · 1,164 bridges
Sumner County, KS · avg 1978 · 659 bridges
Allen County, IN · avg 1978 · 613 bridges
Livingston County, IL · avg 1978 · 579 bridges

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

All 61 Good 17 Fair 38 Poor 6

Fair-condition bridges (38)

Sort:

Camas County Bridge Snapshot

Condition distribution

Camas County's Poor-condition bridges carry 742 vehicle crossings a day

54.1% of Camas County's bridges have passed the 50-year mark

One structure carries 79.5% of the county's Poor-condition bridge traffic

How Camas 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 (38)

FDR

OLD HWY 46;500 E

FDR

MACON FLAT ROAD

FDR

FDR

SOLDIER CREEK

E 100 N ROAD

RDS

OLD HWY 46;500 E

FDR

US 20

US 20

US 20

FDR

MORMON ROAD

FIR GROVE ROAD

STC2802;BASELINE R

US 20

US 20

US 20

SH 46

SH 46

SH 46

SH 46

FDR

SH 46

SH 46

SH 46

US 20

US 20

US 20

US 20

US 20

FDR

WOLF LN;900 WEST

FIR GROVE ROAD

FIR GROVE ROAD

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