County profile · official public datasets

Lyon County, NV

53 public highway bridges tracked in the FHWA National Bridge Inventory: 56.6% rated Good, 35.8% Fair, 7.5% Poor.

53
Public bridges: 56.6%
Good condition: 7.5%
Poor condition

The verdict

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

Lyon 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.

15th
of 16 on Poor share: 7.5%
Poor-condition share: 53
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.

Lyon County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lyon County ranks #15 of 16 Nevada counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.5%). Lyon County, Nevada contains 53 public highway bridges. Roughly 56.6% are rated “Good,” 35.8% “Fair,” and 7.5% “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 Lyon County

Good condition

56.6%

30 of 53 rated 7-9

Fair condition

35.8%

19 of 53 rated 5-6

Poor condition

7.5%

4 of 53 rated 4 or below

In-state Poor-share rank

#15 of 16

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

Condition distribution

Share of 53 NBI-tracked bridges by lowest applicable component rating.

Good

56.6% (30)

Fair

35.8% (19)

Poor

7.5% (4)

Lyon County's Poor-condition bridges carry 557 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 7.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 139 crossings a day against 5,293 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 53 of 53 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

54.7% of Lyon County's bridges have passed the 50-year mark

29 of the 53 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 56.6% 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 49.2% of the county's Poor-condition bridge traffic

RURAL ROAD over TRUCKEE-CARSON CANAL, built 1955, carries 274 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 4-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 557 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1930s

4
1940s

6
1950s

5
1960s

11
1970s

5
1980s

3
1990s

2
2000s

5
2010s

10
2020s

1

What this shows Construction peaked in the 1960s, when 11 of the county's bridges still in the inventory were built, which is 20.8% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1975, 13 years older than the Nevada average of 1988.

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

The 5 Nevada counties nearest Lyon County in number of bridges, with their condition splits. Its 7.5% Poor share is the 6th-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 15 Nevada counties eligible for comparison.

Bridge inventory size and condition shares for Lyon 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	54	33.3%	63%	3.7%	1970
Lyon County (this page)	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 Lyon 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 Lyon County, both outside Nevada so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside NV (53 bridges here).

Cleburne County, AR · 53 bridges
Citrus County, FL · 53 bridges
Lumpkin County, GA · 53 bridges
Stewart County, GA · 53 bridges

Similar average build year

Nearest mean year-built outside NV (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 53 Good 30 Fair 19 Poor 4

Good-condition bridges (30)

Sort:

Lyon County Bridge Snapshot

Condition distribution

Lyon County's Poor-condition bridges carry 557 vehicle crossings a day

54.7% of Lyon County's bridges have passed the 50-year mark

One structure carries 49.2% of the county's Poor-condition bridge traffic

How Lyon 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

Good-condition bridges (30)

SR 208/TOPAZ RD

SR 338/SWEETWATER

SR 338/SWEETWATER

US 50

SR338 SWEETWATER

I 80E

I 80W

SR 208/TOPAZ RD

Minister Road

SNYDER LN

NORDYKE ROAD

SR 824 DAY LN

RICCI RD

US 95A

NEVADA PACIFIC PKW

US 50

I 80E

I 80W

US 95A

SR 340 BRIDGE ST

MILLER LN

US 95A

CLEARWATER PKWY

US 50

SR439 USA PARKWAY

SR439 USA PARKWAY

SR 439 USA PARKWAY

SR439 USA PARKWAY

SR439 USA PARKWAY

US50

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