County profile · official public datasets

Seneca County, NY

60 public highway bridges tracked in the FHWA National Bridge Inventory: 31.7% rated Good, 43.3% Fair, 25% Poor.

60
Public bridges
31.7%
Good condition
25%
Poor condition

The verdict

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

Seneca 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.

62nd
of 62 on Poor share
25%
Poor-condition share
60
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.

Seneca County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Seneca County ranks #62 of 62 New York counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 25%). Seneca County, New York contains 60 public highway bridges. Roughly 31.7% are rated “Good,” 43.3% “Fair,” and 25% “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

60

Public highway bridges in Seneca County

Good condition

31.7%

19 of 60 rated 7-9

Fair condition

43.3%

26 of 60 rated 5-6

Poor condition

25%

15 of 60 rated 4 or below

In-state Poor-share rank

#62 of 62

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

Condition distribution

Share of 60 NBI-tracked bridges by lowest applicable component rating.

Good
31.7% (19)
Fair
43.3% (26)
Poor
25% (15)

Seneca County's Poor-condition bridges carry 19,554 vehicle crossings a day

That is 9.6% of the county's reported daily bridge traffic on 25% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,304 crossings a day against 3,078 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 60 of 60 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

65% of Seneca County's bridges have passed the 50-year mark

39 of the 60 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 31.7% 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 63.1% of the county's Poor-condition bridge traffic

RTE 5 over CAY & SEN CANAL, built 1932, carries 12,332 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 15-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 19,554 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Seneca County's bridges were built

60 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1950s, when 15 of the county's bridges still in the inventory were built, which is 25% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1964, 8 years older than the New York average of 1972.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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

The 5 New York counties nearest Seneca County in number of bridges, with their condition splits. Its 25% Poor share is the 6th-lowest of these 6. Its average build year of 1964 against a peer-group mean of 1974 is 10 years older.

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

Bridge inventory size and condition shares for Seneca County and the 5 New York counties closest to it in inventory size
County Bridges Poor
Schuyler County 100 5%
Fulton County 98 15.3%
Wayne County 97 10.3%
Hamilton County 88 14.8%
Seneca County (this page) 60 25%
Yates County 55 1.8%

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

Similar inventory size

Nearest county inventories outside NY (60 bridges here).

Similar average build year

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

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

All 60 Good 19 Fair 26 Poor 15

Poor-condition bridges (15)

DEAN ROAD

Poor

Over: MILL CREEK

1.9 MI W OF NY414, Seneca, NY

Built 1936 Load: 0.0 t ADT: 34

POTTER MORGAN ROAD

Poor

Over: SHELDRAKE CREEK

2.5 MI N OF INTERLAKEN, Seneca, NY

Built 1920 Load: 0.0 t ADT: 83

GORHAM STREET

Poor

Over: SENECA RIVER

0.6 MI E JCT 96+BARGE C, Seneca, NY

Built 1916 Load: 0.0 t ADT: 900

LOCUST STREET

Poor

Over: CAYUGA & SENECA CANAL P

Intersection SH96 & B CNL, Seneca, NY

Built 1914 Load: 0.0 t ADT: 503

FRONTENAC ROAD

Poor

Over: TRUMANSBURG CREEK

7.9 MI SE OF INTERLAKEN, Seneca, NY

Built 1940 Load: 4.5 t ADT: 164

ARMITAGE ROAD

Poor

Over: ERIE CANAL

2.3 MI NW JCT SH 89 & CNL, Seneca, NY

Built 1914 Load: 5.4 t ADT: 275

WYERS POINT ROAD

Poor

Over: GROVES CREEK

1.0 MI NE OF NY89, Seneca, NY

Built 1936 Load: 8.2 t ADT: 105

MARSHALL ROAD

Poor

Over: KENDIG CREEK

2.5 MI SW OF WATERLOO, Seneca, NY

Built 1950 Load: 10.1 t ADT: 600

GILBERT ROAD

Poor

Over: TOMMY CREEK

2.1 MI NW OF LODI, Seneca, NY

Built 1983 Load: 16.5 t ADT: 723

COUNTY ROAD 153

Poor

Over: SHELDRAKE CREEK

1.1 MI EAST OF NY89, Seneca, NY

Built 1994 Load: 21.8 t ADT: 319

RTE 5

Poor

Over: CAY & SEN CANAL

JCT US 20 & CAY & SEN CNL, Seneca, NY

Built 1932 Load: 24.5 t ADT: 12,332

RTE 31

Poor

Over: ERIE CANAL

JCT SH 31 & CAY & SEN CNL, Seneca, NY

Built 1949 Load: 25.6 t ADT: 1,853

HALL ROAD

Poor

Over: SHELDRAKE CREEK

2.7 MI NW OF INTERLAKEN, Seneca, NY

Built 1958 Load: 32.7 t ADT: 35

LODI CENTER RD

Poor

Over: MILL CREEK

1.0 MI S OF LODI, Seneca, NY

Built 1936 Load: 33.6 t ADT: 324

RTE 89

Poor

Over: 90IX RTE I90

JCT OF RTS 89 + I-90, Seneca, NY

Built 1953 Load: 39.0 t ADT: 1,304

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.