County profile · official public datasets

Lamoille County, VT

127 public highway bridges tracked in the FHWA National Bridge Inventory: 54.3% rated Good, 41.7% Fair, 3.9% Poor.

127
Public bridges: 54.3%
Good condition: 3.9%
Poor condition

The verdict

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

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

12th
of 14 on Poor share: 3.9%
Poor-condition share: 127
public highway bridges: 1964
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.

Lamoille County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lamoille County ranks #12 of 14 Vermont counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.9%). Lamoille County, Vermont contains 127 public highway bridges. Roughly 54.3% are rated “Good,” 41.7% “Fair,” and 3.9% “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

127

Public highway bridges in Lamoille County

Good condition

54.3%

69 of 127 rated 7-9

Fair condition

41.7%

53 of 127 rated 5-6

Poor condition

3.9%

5 of 127 rated 4 or below

In-state Poor-share rank

#12 of 14

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

Condition distribution

Share of 127 NBI-tracked bridges by lowest applicable component rating.

Good

54.3% (69)

Fair

41.7% (53)

Poor

3.9% (5)

Lamoille County's Poor-condition bridges carry 6,700 vehicle crossings a day

That is 2.7% of the county's reported daily bridge traffic on 3.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,340 crossings a day against 1,775 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 127 of 127 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

52.8% of Lamoille County's bridges have passed the 50-year mark

67 of the 127 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 54.3% 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 61.2% of the county's Poor-condition bridge traffic

VT 00100 ML over GIHON RIVER, built 1932, carries 4,100 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 5-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 6,700 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

8
1910s

3
1920s

12
1930s

16
1940s

6
1950s

14
1960s

5
1970s

9
1980s

17
1990s

14
2000s

5
2010s

13
2020s

5

What this shows Construction peaked in the 1980s, when 17 of the county's bridges still in the inventory were built, which is 13.4% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1964) matches the Vermont average (1964).

How Lamoille County compares with Vermont's closest counties by inventory size

The 5 Vermont counties nearest Lamoille County in number of bridges, with their condition splits. Its 3.9% Poor share is the 6th-lowest of these 6. Its average build year of 1964 against a peer-group mean of 1966 is in line with the group.

Showing the 5 closest of 13 Vermont counties eligible for comparison.

Bridge inventory size and condition shares for Lamoille County and the 5 Vermont counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Chittenden County	184	54.9%	42.9%	2.2%	1967
Orleans County	181	52.5%	44.8%	2.8%	1971
Franklin County	149	56.4%	43.6%	0%	1963
Addison County	143	51.7%	45.5%	2.8%	1965
Lamoille County (this page)	127	54.3%	41.7%	3.9%	1964
Essex County	66	57.6%	39.4%	3%	1965

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

Similar inventory size

Nearest county inventories outside VT (127 bridges here).

Yuba County, CA · 127 bridges
Jefferson County, ID · 127 bridges
Harrison County, IN · 127 bridges
Vermillion County, IN · 127 bridges

Similar average build year

Nearest mean year-built outside VT (1964 here).

Bergen County, NJ · avg 1964 · 577 bridges
Morris County, NJ · avg 1964 · 508 bridges
Baltimore city County, MD · avg 1964 · 374 bridges
Ross County, OH · avg 1964 · 356 bridges

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

All 127 Good 69 Fair 53 Poor 5

Good-condition bridges (69)

Sort:

Lamoille County Bridge Snapshot

Condition distribution

Lamoille County's Poor-condition bridges carry 6,700 vehicle crossings a day

52.8% of Lamoille County's bridges have passed the 50-year mark

One structure carries 61.2% of the county's Poor-condition bridge traffic

How Lamoille County compares with Vermont'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 (69)

C3031

C3034

VT 00108 ML

VT 00100 ML

C3030

C3007

C3003

C3011

TR 01 FAS 247

C3017

C3008

C4035

C3025

C2004

C3026

C3056

C3028

C3036

C3070

VT 00108 ML

C3031

C3060

C2004

VT 0100C ALT

C3012

VT 00015 ML

VT 00108 ML

VT 00109 ML

C3046

C2006

C3050

C2006

VT 00015 ML

VT 0015A ALT

VT 00108 ML

C2001

C3009

C3013

C3013

C3046

C3010

VT 00015 ML

VT 00015 ML

TR 03 FAS 238

VT 00015 ML

VT 0100C ALT

C3008

VT 00100 ML

VT 00015 ML

C3013

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