County profile · official public datasets

Westchester County, NY

774 public highway bridges tracked in the FHWA National Bridge Inventory: 23.3% rated Good, 67.2% Fair, 9.6% Poor.

774
Public bridges: 23.3%
Good condition: 9.6%
Poor condition

The verdict

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

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

Top 48%
lowest Poor share in state: 9.6%
Poor-condition share: 774
public highway bridges: 1961
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.

Westchester County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Westchester County ranks #30 of 62 New York counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.6%). Westchester County, New York contains 774 public highway bridges. Roughly 23.3% are rated “Good,” 67.2% “Fair,” and 9.6% “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

774

Public highway bridges in Westchester County

Good condition

23.3%

180 of 774 rated 7-9

Fair condition

67.2%

520 of 774 rated 5-6

Poor condition

9.6%

74 of 774 rated 4 or below

In-state Poor-share rank

#30 of 62

Among New York counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 774 NBI-tracked bridges by lowest applicable component rating.

Good

23.3% (180)

Fair

67.2% (520)

Poor

9.6% (74)

Westchester County's Poor-condition bridges carry 1,194,913 vehicle crossings a day

That is 7.7% of the county's reported daily bridge traffic on 9.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 17,572 crossings a day against 24,180 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 704 of 774 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

70.5% of Westchester County's bridges have passed the 50-year mark

546 of the 774 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 23.3% 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 12% of the county's Poor-condition bridge traffic

RTE 907K over 907G X MC QUESTEN AVENU, built 1983, carries 143,278 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 74-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,194,913 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

18
1900s

17
1910s

26
1920s

72
1930s

96
1940s

14
1950s

115
1960s

124
1970s

74
1980s

49
1990s

59
2000s

58
2010s

37
2020s

15

What this shows Construction peaked in the 1960s, when 124 of the county's bridges still in the inventory were built, which is 16% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1961, 11 years older than the New York average of 1972.

How Westchester County compares with New York's closest counties by inventory size

The 5 New York counties nearest Westchester County in number of bridges, with their condition splits. Its 9.6% Poor share is the 4th-lowest of these 6. Its average build year of 1961 against a peer-group mean of 1975 is 14 years older.

Showing the 5 closest of 61 New York counties eligible for comparison.

Bridge inventory size and condition shares for Westchester County and the 5 New York counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Erie County	906	37.9%	53.4%	8.7%	1973
Westchester County (this page)	774	23.3%	67.2%	9.6%	1961
Steuben County	627	41.5%	54.4%	4.1%	1984
Monroe County	615	36.4%	52.7%	10.9%	1975
Chautauqua County	559	44%	46.3%	9.7%	1977
Queens County	514	30.4%	62.3%	7.4%	1966

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 Westchester 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 Westchester County, both outside New York so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside NY (774 bridges here).

Fulton County, GA · 775 bridges
Johnson County, KS · 781 bridges
Baltimore County, MD · 783 bridges
Hamilton County, OH · 783 bridges

Similar average build year

Nearest mean year-built outside NY (1961 here).

Tehama County, CA · avg 1961 · 450 bridges
Berkshire County, MA · avg 1961 · 450 bridges
Schuylkill County, PA · avg 1961 · 368 bridges
Columbiana County, OH · avg 1961 · 321 bridges

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

All 774 Good 180 Fair 520 Poor 74

All bridges (774)

Sort:

Westchester County Bridge Snapshot

Condition distribution

Westchester County's Poor-condition bridges carry 1,194,913 vehicle crossings a day

70.5% of Westchester County's bridges have passed the 50-year mark

One structure carries 12% of the county's Poor-condition bridge traffic

How Westchester County compares with New York'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 (774)

MAMARONECK AVENUE

RTE I684

RTE 9A

SOUTH ROAD

SECOR ROAD

RTE 9

RAMP TO HRP NB

RTE I684

HOSPITAL RD

RTE 100B

RTE I87

MILL STREET

RTE 9

RTE I684

RTE I287

BRANDRETH STREET

THOMPSON STREET

RTE 907K

WEBSTER AVENUE RAM

SEMINARY AVENUE

HARTSDALE ROAD

RTE 987G

RTE 987G

RTE I95

UNDERHILL ROAD

RTE 6

LAWRENCE STREET

GREENACRES AVE

RTE 907G

RAMP X TO 907K E.

KIMBALL AVENUE

HEATHERDELL ROAD

RTE I87

PARKING PLAZA RMP

RTE 907K

RTE 116

RTE I684

RTE I684

RTE 9A

WOOD STREET

MILE SQUARE ROAD

RTE 987D

RTE 987G

JAY STREET

PARK AVE VIADUCT

JACKSON AVENUE

RTE I95

RTE 987D

COUNTY ROAD 306

RTE I684

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