County profile · official public datasets

Humboldt County, NV

54 public highway bridges tracked in the FHWA National Bridge Inventory: 33.3% rated Good, 63% Fair, 3.7% Poor.

54
Public bridges: 33.3%
Good condition: 3.7%
Poor condition

The verdict

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

Humboldt County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

14th
of 16 on Poor share: 3.7%
Poor-condition share: 54
public highway bridges: 1970
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.

Humboldt County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Humboldt County ranks #14 of 16 Nevada counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.7%). Humboldt County, Nevada contains 54 public highway bridges. Roughly 33.3% are rated “Good,” 63% “Fair,” and 3.7% “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 Humboldt County

Good condition

33.3%

18 of 54 rated 7-9

Fair condition

63%

34 of 54 rated 5-6

Poor condition

3.7%

2 of 54 rated 4 or below

In-state Poor-share rank

#14 of 16

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

Condition distribution

Share of 54 NBI-tracked bridges by lowest applicable component rating.

Good

33.3% (18)

Fair

63% (34)

Poor

3.7% (2)

Humboldt County's Poor-condition bridges carry 9,055 vehicle crossings a day

That is 5.5% of the county's reported daily bridge traffic on 3.7% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 4,528 crossings a day against 2,766 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 54 of 54 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

59.3% of Humboldt County's bridges have passed the 50-year mark

32 of the 54 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 33.3% 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.

One structure carries 99.4% of the county's Poor-condition bridge traffic

CROSS ROAD over I 80, built 1970, carries 9,000 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 2-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 9,055 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1930s

2
1940s

2
1950s

3
1960s

15
1970s

21
1980s

6
1990s

2
2010s

1
2020s

1

What this shows Construction peaked in the 1970s, when 21 of the county's bridges still in the inventory were built, which is 38.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1970, 18 years older than the Nevada average of 1988.

How Humboldt County compares with Nevada's closest counties by inventory size

The 5 Nevada counties nearest Humboldt County in number of bridges, with their condition splits. Its 3.7% Poor share is the 5th-lowest of these 6. Its average build year of 1970 against a peer-group mean of 1980 is 10 years older.

Showing the 5 closest of 15 Nevada counties eligible for comparison.

Bridge inventory size and condition shares for Humboldt County and the 5 Nevada counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Churchill County	70	51.4%	48.6%	0%	1981
Humboldt County (this page)	54	33.3%	63%	3.7%	1970
Lyon County	53	56.6%	35.8%	7.5%	1975
Pershing County	52	42.3%	57.7%	0%	1972
Douglas County	42	59.5%	40.5%	0%	1971
Carson City County	31	87.1%	12.9%	0%	2003

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

Similar inventory size

Nearest county inventories outside NV (54 bridges here).

Rio Blanco County, CO · 54 bridges
Brantley County, GA · 54 bridges
Jones County, GA · 54 bridges
Larue County, KY · 54 bridges

Similar average build year

Nearest mean year-built outside NV (1970 here).

Hamilton County, OH · avg 1970 · 783 bridges
Yavapai County, AZ · avg 1970 · 543 bridges
Garfield County, OK · avg 1970 · 504 bridges
San Luis Obispo County, CA · avg 1970 · 401 bridges

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

All 54 Good 18 Fair 34 Poor 2

Fair-condition bridges (34)

Sort:

Humboldt County Bridge Snapshot

Condition distribution

Humboldt County's Poor-condition bridges carry 9,055 vehicle crossings a day

59.3% of Humboldt County's bridges have passed the 50-year mark

One structure carries 99.4% of the county's Poor-condition bridge traffic

How Humboldt County compares with Nevada'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 (34)

OLD US 40

BRIDGE STREET

I 80E OFF-RAMP

SR 787 HANSEN ST

I 80E

I 80W

IRR CORDERO MINE R

OLD SR 8A

LEONARD CREEK ROAD

US 95

SR 290 PARADISE RD

IRR CORDERO MINE R

BIG FOOT LANE

I 80E

I 80W

US 95

I 80

I 80

CROSS ROAD

I 80E

I 80W

BRIDGE ST

I 80

I 80W

I 80E

I 80W

SR789 GETCHELL MIN

US 95

I 80E

I 80W

I 80E

I 80W

SR789 GETCHELL MIN

VALMY RD

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