County profile · official public datasets

San Sebastián County, PR

31 public highway bridges tracked in the FHWA National Bridge Inventory: 16.1% rated Good, 74.2% Fair, 9.7% Poor.

31
Public bridges: 16.1%
Good condition: 9.7%
Poor condition

The verdict

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

San Sebastián County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 22%
lowest Poor share in state: 9.7%
Poor-condition share: 31
public highway bridges: 1966
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.

San Sebastián County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, San Sebastián County ranks #16 of 74 Puerto Rico counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.7%). San Sebastián County, Puerto Rico contains 31 public highway bridges. Roughly 16.1% are rated “Good,” 74.2% “Fair,” and 9.7% “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 San Sebastián County

Good condition

16.1%

5 of 31 rated 7-9

Fair condition

74.2%

23 of 31 rated 5-6

Poor condition

9.7%

3 of 31 rated 4 or below

In-state Poor-share rank

#16 of 74

Among Puerto Rico counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 31 NBI-tracked bridges by lowest applicable component rating.

Good

16.1% (5)

Fair

74.2% (23)

Poor

9.7% (3)

San Sebastián County's Poor-condition bridges carry 32,800 vehicle crossings a day

That is 14.7% of the county's reported daily bridge traffic on 9.7% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 10,933 crossings a day against 5,960 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 31 of 31 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

45.2% of San Sebastián County's bridges have passed the 50-year mark

14 of the 31 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 16.1% 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 60.1% of the county's Poor-condition bridge traffic

PR 111 over QUEBRADA EL SALTO, built 1901, carries 19,700 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 3-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 32,800 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

2
1910s

3
1920s

1
1940s

4
1950s

3
1960s

1
1970s

3
1980s

3
1990s

4
2000s

7

What this shows Construction peaked in the 2000s, when 7 of the county's bridges still in the inventory were built, which is 22.6% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1966, 8 years older than the Puerto Rico average of 1974.

How San Sebastián County compares with Puerto Rico's closest counties by inventory size

The 5 Puerto Rico counties nearest San Sebastián County in number of bridges, with their condition splits. Its 9.7% Poor share is the 1st-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1971 is 5 years older.

Showing the 5 closest of 73 Puerto Rico counties eligible for comparison.

Bridge inventory size and condition shares for San Sebastián County and the 5 Puerto Rico counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Adjuntas County	33	9.1%	75.8%	15.2%	1960
Patillas County	32	21.9%	59.4%	18.8%	1970
San Sebastián County (this page)	31	16.1%	74.2%	9.7%	1966
Canóvanas County	30	36.7%	46.7%	16.7%	1979
Coamo County	30	10%	73.3%	16.7%	1970
Ceiba County	29	13.8%	72.4%	13.8%	1975

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 San Sebastián 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 San Sebastián County, both outside Puerto Rico so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside PR (31 bridges here).

Hinsdale County, CO · 31 bridges
Kiowa County, CO · 31 bridges
Ogemaw County, MI · 31 bridges
Grant County, MN · 31 bridges

Similar average build year

Nearest mean year-built outside PR (1966 here).

Butler County, KS · avg 1966 · 591 bridges
Grafton County, NH · avg 1966 · 544 bridges
Queens County, NY · avg 1966 · 514 bridges
Lehigh County, PA · avg 1966 · 381 bridges

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

All 31 Good 5 Fair 23 Poor 3

Fair-condition bridges (23)

Sort:

San Sebastián County Bridge Snapshot

Condition distribution

San Sebastián County's Poor-condition bridges carry 32,800 vehicle crossings a day

45.2% of San Sebastián County's bridges have passed the 50-year mark

One structure carries 60.1% of the county's Poor-condition bridge traffic

How San Sebastián County compares with Puerto Rico'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 (23)

Off PR 119 Km38.42

PR 119

PR 125

PR 125

PR 109

PR 109

PR 119

PR 109

PR 119

PR 447

OFF PR 125

PR 497

PR 111

PR 450 KM 2.24

PEDRO ALBIZU ST.

OFF PR 111

OFF PR 125

PR 455

PR 125

PR-111

PR 125

PR 125

PR 111

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