County profile · official public datasets

San Lorenzo County, PR

51 public highway bridges tracked in the FHWA National Bridge Inventory: 15.7% rated Good, 68.6% Fair, 15.7% Poor.

51
Public bridges: 15.7%
Good condition: 15.7%
Poor condition

The verdict

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

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

43rd
of 74 on Poor share: 15.7%
Poor-condition share: 51
public highway bridges: 1970
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 Lorenzo County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, San Lorenzo County ranks #43 of 74 Puerto Rico counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.7%). San Lorenzo County, Puerto Rico contains 51 public highway bridges. Roughly 15.7% are rated “Good,” 68.6% “Fair,” and 15.7% “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 Lorenzo County

Good condition

15.7%

8 of 51 rated 7-9

Fair condition

68.6%

35 of 51 rated 5-6

Poor condition

15.7%

8 of 51 rated 4 or below

In-state Poor-share rank

#43 of 74

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

Condition distribution

Share of 51 NBI-tracked bridges by lowest applicable component rating.

Good

15.7% (8)

Fair

68.6% (35)

Poor

15.7% (8)

San Lorenzo County's Poor-condition bridges carry 26,875 vehicle crossings a day

That is 14.4% of the county's reported daily bridge traffic on 16% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,359 crossings a day against 4,657 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 50 of 51 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

56.9% of San Lorenzo County's bridges have passed the 50-year mark

29 of the 51 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 15.7% 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 30.9% of the county's Poor-condition bridge traffic

PR 181 over GRANDE DE LOIZA RIVER, built 1940, carries 8,300 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 8-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 26,875 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

4
1930s

6
1940s

6
1950s

4
1960s

7
1970s

2
1980s

1
1990s

12
2000s

7
2010s

2

What this shows Construction peaked in the 1990s, when 12 of the county's bridges still in the inventory were built, which is 23.5% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1970) matches the Puerto Rico average (1974).

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

The 5 Puerto Rico counties nearest San Lorenzo County in number of bridges, with their condition splits. Its 15.7% Poor share is the 3rd-lowest of these 6. Its average build year of 1970 against a peer-group mean of 1973 is in line with the group.

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

Bridge inventory size and condition shares for San Lorenzo County and the 5 Puerto Rico counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Utuado County	57	12.3%	66.7%	21.1%	1961
Juana Díaz County	55	9.1%	72.7%	18.2%	1970
Arecibo County	51	3.9%	78.4%	17.6%	1971
Naguabo County	51	23.5%	66.7%	9.8%	1982
San Lorenzo County (this page)	51	15.7%	68.6%	15.7%	1970
Río Grande County	47	34%	53.2%	12.8%	1979

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

Similar inventory size

Nearest county inventories outside PR (51 bridges here).

Jackson County, KY · 51 bridges
Gregory County, SD · 51 bridges
Garza County, TX · 51 bridges
Knox County, TX · 51 bridges

Similar average build year

Nearest mean year-built outside PR (1970 here).

Hamilton County, OH · avg 1970 · 783 bridges
Yavapai County, AZ · avg 1970 · 543 bridges
Garfield County, OK · avg 1970 · 504 bridges
San Luis Obispo County, CA · avg 1970 · 401 bridges

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

All 51 Good 8 Fair 35 Poor 8

Fair-condition bridges (35)

Sort:

San Lorenzo County Bridge Snapshot

Condition distribution

San Lorenzo County's Poor-condition bridges carry 26,875 vehicle crossings a day

56.9% of San Lorenzo County's bridges have passed the 50-year mark

One structure carries 30.9% of the county's Poor-condition bridge traffic

How San Lorenzo 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 (35)

PR 181

PR 181

PR 913

PR 9920

PR 9920

PR 181

PR 181

PR 912

PR 181

PR 181

PR 9912

PR 181

OFF PR 183

PR 181

PR 181

OFF PR 181

OFF PR 745 KM 2.30

OFF PR 913

PR 902

PR 9931

PR 9916

PR 183

PR 902

OFF PR 913

LOCAL ROAD

OFF PR 183

OFF PR 745 KM 3.20

PR 181

PR 183

LOCAL ROAD

OFF PR 788

Cam. Carrasco Km.

PR 203

OFF PR 764

PR 181

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